diff --git a/README.md b/README.md
deleted file mode 100644
index f90de4d..0000000
--- a/README.md
+++ /dev/null
@@ -1,2 +0,0 @@
-# GrowSystem
-
diff --git a/REDME.md b/REDME.md
deleted file mode 100644
index bc52edf..0000000
--- a/REDME.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Show output on terminal #
-`minicom -b 115200 -o -D /dev/cu.usbmodem3301`
-
diff --git a/bh1750.old_1/__init__.py b/bh1750.old_1/__init__.py
deleted file mode 100644
index ab5e217..0000000
--- a/bh1750.old_1/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-from .bh1750 import BH1750
diff --git a/bh1750.old_1/bh1750.py b/bh1750.old_1/bh1750.py
deleted file mode 100644
index 21cebbe..0000000
--- a/bh1750.old_1/bh1750.py
+++ /dev/null
@@ -1,118 +0,0 @@
-# https://github.com/flrrth/pico-bh1750
-
-import math
-
-from micropython import const
-from utime import sleep_ms
-
-
-class BH1750:
-    """Class for the BH1750 digital Ambient Light Sensor
-
-    The datasheet can be found at https://components101.com/sites/default/files/component_datasheet/BH1750.pdf
-    """
-    
-    MEASUREMENT_MODE_CONTINUOUSLY = const(1)
-    MEASUREMENT_MODE_ONE_TIME = const(2)
-    
-    RESOLUTION_HIGH = const(0)
-    RESOLUTION_HIGH_2 = const(1)
-    RESOLUTION_LOW = const(2)
-    
-    MEASUREMENT_TIME_DEFAULT = const(69)
-    MEASUREMENT_TIME_MIN = const(31)
-    MEASUREMENT_TIME_MAX = const(254)
-
-    def __init__(self, address, i2c):
-        self._address = address
-        self._i2c = i2c
-        self._measurement_mode = BH1750.MEASUREMENT_MODE_ONE_TIME
-        self._resolution = BH1750.RESOLUTION_HIGH
-        self._measurement_time = BH1750.MEASUREMENT_TIME_DEFAULT
-        
-        self._write_measurement_time()
-        self._write_measurement_mode()
-        
-    def configure(self, measurement_mode: int, resolution: int, measurement_time: int):
-        """Configures the BH1750.
-
-        Keyword arguments:
-        measurement_mode -- measure either continuously or once
-        resolution -- return measurements in either high, high2 or low resolution
-        measurement_time -- the duration of a single measurement
-        """
-        if measurement_time not in range(BH1750.MEASUREMENT_TIME_MIN, BH1750.MEASUREMENT_TIME_MAX + 1):
-            raise ValueError("measurement_time must be between {0} and {1}"
-                             .format(BH1750.MEASUREMENT_TIME_MIN, BH1750.MEASUREMENT_TIME_MAX))
-        
-        self._measurement_mode = measurement_mode
-        self._resolution = resolution
-        self._measurement_time = measurement_time
-        
-        self._write_measurement_time()
-        self._write_measurement_mode()
-    
-    def _write_measurement_time(self):
-        buffer = bytearray(1)
-        
-        high_bit = 1 << 6 | self._measurement_time >> 5
-        low_bit = 3 << 5 | (self._measurement_time << 3) >> 3
-                
-        buffer[0] = high_bit
-        self._i2c.writeto(self._address, buffer)
-        
-        buffer[0] = low_bit
-        self._i2c.writeto(self._address, buffer)
-        
-    def _write_measurement_mode(self):
-        buffer = bytearray(1)
-                
-        buffer[0] = self._measurement_mode << 4 | self._resolution
-        self._i2c.writeto(self._address, buffer)
-        sleep_ms(24 if self._measurement_time == BH1750.RESOLUTION_LOW else 180)
-        
-    def reset(self):
-        """Clear the illuminance data register."""
-        self._i2c.writeto(self._address, bytearray(b'\x07'))
-    
-    def power_on(self):
-        """Powers on the BH1750."""
-        self._i2c.writeto(self._address, bytearray(b'\x01'))
-
-    def power_off(self):
-        """Powers off the BH1750."""
-        self._i2c.writeto(self._address, bytearray(b'\x00'))
-
-    @property
-    def measurement(self) -> float:
-        """Returns the latest measurement."""
-        if self._measurement_mode == BH1750.MEASUREMENT_MODE_ONE_TIME:
-            self._write_measurement_mode()
-            
-        buffer = bytearray(2)
-        self._i2c.readfrom_into(self._address, buffer)
-        lux = (buffer[0] << 8 | buffer[1]) / (1.2 * (BH1750.MEASUREMENT_TIME_DEFAULT / self._measurement_time))
-        
-        if self._resolution == BH1750.RESOLUTION_HIGH_2:
-            return lux / 2
-        else:
-            return lux
-    
-    def measurements(self) -> float:
-        """This is a generator function that continues to provide the latest measurement. Because the measurement time
-        is greatly affected by resolution and the configured measurement time, this function attemts to calculate the
-        appropriate sleep time between measurements.
-
-        Example usage:
-
-        for measurement in bh1750.measurements():  # bh1750 is an instance of this class
-            print(measurement)
-        """
-        while True:
-            yield self.measurement
-            
-            if self._measurement_mode == BH1750.MEASUREMENT_MODE_CONTINUOUSLY:
-                base_measurement_time = 16 if self._measurement_time == BH1750.RESOLUTION_LOW else 120
-                sleep_ms(math.ceil(base_measurement_time * self._measurement_time / BH1750.MEASUREMENT_TIME_DEFAULT))
-                
-
diff --git a/device_info.py b/device_info.py
deleted file mode 100644
index 65ab51a..0000000
--- a/device_info.py
+++ /dev/null
@@ -1,62 +0,0 @@
-import network
-
-
-class DeviceInfo:
-    
-    # Device Infos
-    name = "Dev Device 1"
-    
-    token = "PC]-0Bmp83h7F5#U!D6KJ(A&"
-    
-    server_url = 'api.growsystem.muelleronline.org'
-    
-    wlan_ssid = 'Oppa-95.lan'
-    wlan_pw = '95%04-MM'
-
-    sensors = [
-        {
-            'type': 'moisture',
-            'pin_int': 26
-        },
-        {
-            'type': 'ambilight',
-            'pin_int': 8, # for compatibility only
-            'pin_int_sda': 8,
-            'pin_int_scl': 9
-        },
-        
-        
-       # {
-       #     'type': 'dht22',
-       #     'pin_int': 15
-       #     }
-        ]
-    
-    read_secs = 5
-    # Device Infos End
-    
-    wlan = network.WLAN(network.STA_IF)
-    
-    def get_macaddress(self):
-        return self._format_mac(self.wlan.config('mac').hex())
-    
-    def get_ipaddress(self):
-        return self.wlan.ifconfig()[0]
-    
-    def get_all_device_infos(self):
-        return {
-            'name': self.name,
-            'mac_address': self.get_macaddress(),
-            'ip_address': self.get_ipaddress(),
-            'token': self.token}
-    
-    def _format_mac(self, mac):
-    # Split the MAC address into pairs of two characters each
-        pairs = [mac[i:i+2] for i in range(0, len(mac), 2)]
-    # Join the pairs with colons to create the formatted MAC address
-        formatted_mac = ":".join(pairs)
-        return formatted_mac
-    
-    
-    
-    
\ No newline at end of file
diff --git a/grow_system.py b/grow_system.py
deleted file mode 100644
index 3528ea9..0000000
--- a/grow_system.py
+++ /dev/null
@@ -1,78 +0,0 @@
-import time
-from moisture_sensor import MoistureSensor
-from dht22 import TemperatureHumiditySensor
-from ambilight_sensor import AmbilightSensor
-from sensor_data_manager import SensorDataManager
-from grow_system_api import GrowSystemApi
-from device_info import DeviceInfo
-
-
-class GrowSystem:
-
-    grow_system_api = GrowSystemApi()
-    
-    # moisture_sensor = None
-    # temperature_humidity_sensor = None
-
-    sensors = []
-
-    most_recent_values = []
-    
-    sensor_data_manager = None
-    
-    device_id = None
-    
-    device_info = DeviceInfo()
-
-    def __init__(self, settings):       
-        for sensor in self.device_info.sensors:
-            print("")
-            print("Initialize sensor:")
-            print(sensor)
-            sensor_type = sensor['type']
-            if sensor_type == 'moisture':
-                print("Found sensor of type moisture")
-                self.sensors.append(MoistureSensor(sensor))
-            elif sensor_type == 'dht22':
-                print("Found sensor of type DHT22")
-                self.sensors.append(TemperatureHumiditySensor(sensor))
-            elif sensor_type == 'ambilight':
-                print("Found sensor of type GY302/BH1750")
-                self.sensors.append(AmbilightSensor(sensor))
-            else:
-                print("No sensor type configured for: " + sensor['type'])
-            
-        #if not self.moisture_sensor:
-        #    self.moisture_sensor = MoistureSensor(settings['moisture_sensor'])
-
-        #if not self.temperature_humidity_sensor:
-        #    self.temperature_humidity_sensor = TemperatureHumiditySensor(settings['temperature_humidity_sensor'])
-
-    def start(self):
-        print("Say the server hello...")
-        result = self.grow_system_api.say_hello()
-        message = result['message']
-                
-        if message != 'OK':
-            print("Device not activated. Stopping")
-            return
-        
-        self.device_id = result['data']['device_id']
-        self.sensor_data_manager = SensorDataManager(self.device_id)
-        
-        print("Start reading sensors ...")
-        while True:
-            # Reset data
-            self.most_recent_values = []
-            
-            for sensor in self.sensors:
-                print("Read sensor of type " + sensor.type + " at pin " + str(sensor.sensor_pin_int))
-                sensor.read()
-                for measurement in sensor.most_recent_values:
-                    print(f"Got {measurement['value']} {measurement['unit']} ({measurement['type']})")
-                self.most_recent_values = self.most_recent_values + sensor.most_recent_values
-
-            self.sensor_data_manager.handleData(self.most_recent_values)
-            
-            time.sleep(self.device_info.read_secs)
-
diff --git a/grow_system_api.py b/grow_system_api.py
deleted file mode 100644
index 0e3376c..0000000
--- a/grow_system_api.py
+++ /dev/null
@@ -1,31 +0,0 @@
-from http_client import HTTPClient
-from device_info import DeviceInfo
-import json
-
-
-class GrowSystemApi:
-     
-    http_client = HTTPClient()
-    
-    device_info = DeviceInfo()
-    
-    base_url = ''
-    
-    def __init__(self):
-        self.base_url = self.device_info.server_url
-         
-    def say_hello(self):
-        response = self.http_client.post(self.base_url + "/api/device", self._get_device_data())
-        print(response.text)
-        jsonResult = json.loads(response.text)
-        print(jsonResult)
-        return jsonResult;
-    
-    def send_measurements(self, device_id, data):
-        url = self.base_url + "/api/device/" + str(device_id) + "/sensor-log"
-        response = self.http_client.post(url, data)
-        return json.loads(response.text)
-            
-    def _get_device_data(self):
-        return self.device_info.get_all_device_infos()
-    
diff --git a/gs/classes/a_sensors.py b/gs/classes/a_sensors.py
new file mode 100644
index 0000000..af4244e
--- /dev/null
+++ b/gs/classes/a_sensors.py
@@ -0,0 +1,13 @@
+class Sensors:
+    # this is a parent class for the Sensor classes
+    sensor_pin_int = -1
+    
+    sensor = None
+    
+    type = "unset"
+    
+    def __init__(self, settings):
+        self.type = settings['type']
+        print("Initialize " + self.type + " sensor. Sensor pin is: " + str(settings['pin_int']))
+    
+    
diff --git a/gs/classes/http_request.py b/gs/classes/http_request.py
new file mode 100644
index 0000000..c85063c
--- /dev/null
+++ b/gs/classes/http_request.py
@@ -0,0 +1,72 @@
+import json
+import ure as re
+
+
+class HttpRequest:
+    
+    METHOD = {
+        "GET": "GET",
+        "POST": "POST"
+        }
+    
+    method = ''
+    path = ''
+    raw_content = ''
+    headers = {}
+    
+    def __init__(self, request):
+        self.original_request = request
+        # self.method = method
+        # self.path = path
+        # self.headers = headers
+        # self.raw_content = content
+        print("http request initialized")
+        self.parse_request(request)
+        
+    def parse_request(self, request):
+        # Split the request into lines
+        lines = request.decode().split('\r\n')
+        
+        # Extract method, path, and HTTP version from the first line
+        self.method, self.path, _ = lines[0].split()
+
+        # Parse headers
+        for line in lines[1:]:
+            if not line:
+                break  # Empty line indicates end of headers
+            key, value = line.split(': ', 1)
+            self.headers[key] = value
+        
+        # Content is assumed to be in the last line
+        self.raw_content = lines[-1]
+        
+    def get_content_json(self):
+        # Parse the POST request content into a dictionary
+        parsed_content = {}
+        pairs = self.raw_content.split('&')
+        for pair in pairs:
+            key, value = pair.split('=')
+            parsed_content[key] = value
+
+        # Encode the values in the dictionary
+        encoded_content = {}
+        for key, value in parsed_content.items():
+            encoded_value = re.sub(r'%([0-9A-Fa-f]{2})', lambda m: chr(int(m.group(1), 16)), value)
+            encoded_content[key] = encoded_value
+        
+        return encoded_content
+        
+    def __str__(self):
+     return {
+         "method": self.method,
+         "headers": self.headers,
+         "content": self.raw_content,
+         "content_json": self.get_content_json()
+         }
+
+    
+    
+    
+
+
+
diff --git a/sensors.py b/gs/classes/sensors.py
similarity index 98%
rename from sensors.py
rename to gs/classes/sensors.py
index 23ad803..af4244e 100644
--- a/sensors.py
+++ b/gs/classes/sensors.py
@@ -10,4 +10,4 @@ class Sensors:
         self.type = settings['type']
         print("Initialize " + self.type + " sensor. Sensor pin is: " + str(settings['pin_int']))
     
-    
\ No newline at end of file
+    
diff --git a/ambilight_sensor.py b/gs/classes/sensors/ambilight_sensor.py
similarity index 95%
rename from ambilight_sensor.py
rename to gs/classes/sensors/ambilight_sensor.py
index c8f0a3c..df1d966 100644
--- a/ambilight_sensor.py
+++ b/gs/classes/sensors/ambilight_sensor.py
@@ -1,4 +1,4 @@
-from sensors import Sensors
+from gs.classes.a_sensors import Sensors
 from machine import Pin, I2C
 from utime import sleep
 from lib.bh1750 import BH1750
@@ -32,3 +32,4 @@ class AmbilightSensor(Sensors):
             print('Ambilight Error reading temperature/humidity. Check wires')
             print()
 
+
diff --git a/dht22.py b/gs/classes/sensors/dht22.py
similarity index 96%
rename from dht22.py
rename to gs/classes/sensors/dht22.py
index c022666..464b31d 100644
--- a/dht22.py
+++ b/gs/classes/sensors/dht22.py
@@ -1,4 +1,4 @@
-from sensors import Sensors
+from gs.classes.a_sensors import Sensors
 from dht import DHT22
 from machine import ADC, Pin
 
@@ -34,3 +34,4 @@ class TemperatureHumiditySensor(Sensors):
         except OSError:
             print('DHT22 Error reading temperature/humidity. Check wires')
             print()
+
diff --git a/moisture_sensor.py b/gs/classes/sensors/moisture_sensor.py
similarity index 96%
rename from moisture_sensor.py
rename to gs/classes/sensors/moisture_sensor.py
index e11ca76..145cf9a 100644
--- a/moisture_sensor.py
+++ b/gs/classes/sensors/moisture_sensor.py
@@ -1,5 +1,5 @@
 # Moisture Sensor Class
-from sensors import Sensors
+from gs.classes.a_sensors import Sensors
 from machine import ADC, Pin
 
 
@@ -36,4 +36,4 @@ class MoistureSensor(Sensors):
         normalized_value = self.normalize_sensor_value(raw_value)
         return round(100 - normalized_value * 100, 1)
     
-    
\ No newline at end of file
+    
diff --git a/gs/config/app.py b/gs/config/app.py
new file mode 100644
index 0000000..f066dbd
--- /dev/null
+++ b/gs/config/app.py
@@ -0,0 +1,2 @@
+api_url = 'api.growsystem.muellerdev.kozow.com'
+read_secs = 1 * 60
diff --git a/gs/config/examples/device_config.json b/gs/config/examples/device_config.json
new file mode 100644
index 0000000..901d060
--- /dev/null
+++ b/gs/config/examples/device_config.json
@@ -0,0 +1 @@
+{"sensors": [{"pin_int": 15, "type": "dht22"}, {"pin_int": 26, "type": "moisture"}], "device_id": 9, "name": "Fulltest1", "token": "uStIrOgScrpbUr0Y", "user_id": 1}
\ No newline at end of file
diff --git a/gs/config/examples/initial_config.py b/gs/config/examples/initial_config.py
new file mode 100644
index 0000000..9cd4fe6
--- /dev/null
+++ b/gs/config/examples/initial_config.py
@@ -0,0 +1 @@
+config = {"ssid": "Oppa-95.lan", "user_id": "1", "password": "95%04-MM", "pin": 9534}
\ No newline at end of file
diff --git a/gs/device_info.py b/gs/device_info.py
new file mode 100644
index 0000000..93f89aa
--- /dev/null
+++ b/gs/device_info.py
@@ -0,0 +1,66 @@
+import network
+import json
+
+
+class DeviceInfo:
+    
+    wlan = network.WLAN(network.STA_IF)
+        
+    app_version = "1.0.0"
+    
+    def get_macaddress(self):
+        return self._format_mac(self.wlan.config('mac').hex())
+    
+    def get_ipaddress(self):
+        return self.wlan.ifconfig()[0]
+    
+    def get_all_device_infos(self):
+        return {
+            'name': self.get_name(),
+            'mac_address': self.get_macaddress(),
+            'ip_address': self.get_ipaddress(),
+            'token': self.get_token()}
+    
+    def config(self, filepath=None):
+        return self._loadJsonConfig(filepath)
+    
+    def app_config(self):
+        import gs.config.app as app_config
+        return app_config
+        
+    def server_url(self):
+        return self.app_config().api_url
+    
+    def get_token(self):
+        return self.config()['token'] if self.config() and self.config()['token'] else ''
+    
+    def get_name(self):
+        return self.config()['name'] if self.config() and self.config()['name'] else ''
+    
+    def get_device_id(self):
+        return self.config()['device_id'] if self.config() and self.config()['device_id'] else ''
+    
+    def _format_mac(self, mac):
+    # Split the MAC address into pairs of two characters each
+        pairs = [mac[i:i+2] for i in range(0, len(mac), 2)]
+    # Join the pairs with colons to create the formatted MAC address
+        formatted_mac = ":".join(pairs)
+        return formatted_mac
+    
+    def _loadJsonConfig(self, filepath=None):
+        filepath = filepath if filepath else '/gs/config/device_config.json'
+        try:
+            file = open(filepath, "r")
+            json_content = file.read()
+            return json.loads(json_content)
+        except OSError:  # open failed
+            print("File not found: ", filepath)
+            return None
+        
+        #with open(filepath, 'r') as file:
+        #    json_content = file.read()
+        #return json.loads(json_content)
+    
+        
+    
+    
\ No newline at end of file
diff --git a/gs/exceptions/not_subscriptable_error.py b/gs/exceptions/not_subscriptable_error.py
new file mode 100644
index 0000000..19fa115
--- /dev/null
+++ b/gs/exceptions/not_subscriptable_error.py
@@ -0,0 +1,2 @@
+class NotSubscriptableError(Exception):
+    pass
diff --git a/gs/grow_system_api.py b/gs/grow_system_api.py
new file mode 100644
index 0000000..2c85799
--- /dev/null
+++ b/gs/grow_system_api.py
@@ -0,0 +1,64 @@
+from gs.http_client import HTTPClient
+from gs.device_info import DeviceInfo
+from gs.wlan_client import WlanClient
+import json
+import gs.config.initial_config as ic
+
+
+class GrowSystemApi:
+     
+    http_client = HTTPClient()
+    
+    device_info = DeviceInfo()
+    
+    base_url = ''
+    
+    def __init__(self):
+        self.base_url = self.device_info.server_url()
+        self.connect_wifi(ic.config['ssid'], ic.config['password'])
+        
+        # config = self.device_info.config()
+        # print("Config:", config)
+        # print("Test", config['test'])
+        
+    def activate(self, config):
+        print("ACtivate config:", config)
+        data = self._get_device_data()
+        data.update({
+            'user_id': 1,
+            'pin': config['pin']
+            })
+        print("activate ...", data)
+        response = self.http_client.post(self.base_url + "/api/device/activate", data)
+        print("REsponse ...", response)
+        return self._get_json_encoded(response.text)
+         
+    def say_hello(self):
+        response = self.http_client.post(self.base_url + "/api/device", self._get_device_data())
+        print(response.text)
+        jsonResult = json.loads(response.text)
+        print(jsonResult)
+        return jsonResult;
+    
+    def send_measurements(self, device_id, data):
+        url = self.base_url + "/api/device/" + str(device_id) + "/sensor-log"
+        response = self.http_client.post(url, data)
+        try:
+            return json.loads(response.text)
+        except ValueError as e:
+            print("JSON Value error raised after sending measurements")
+        except Exception as e:
+            print("Exception raised while sending measurements", e)
+        return response
+            
+    def _get_device_data(self):
+        return self.device_info.get_all_device_infos()
+    
+    def _get_json_encoded(self, text):
+        return json.loads(text)
+    
+    def connect_wifi(self, ssid, password):
+        print("Connect WLAN")
+        self.wlan_client = WlanClient(ssid, password)
+        self.wlan_client.connect()
+    
diff --git a/gs/growsystem.py b/gs/growsystem.py
new file mode 100644
index 0000000..6046be1
--- /dev/null
+++ b/gs/growsystem.py
@@ -0,0 +1,129 @@
+from gs.setup import Setup
+from gs.device_info import DeviceInfo
+from gs.sensor_data_manager import SensorDataManager
+import os
+import ujson
+import machine
+import time
+from gs.classes.sensors.ambilight_sensor import AmbilightSensor
+from gs.classes.sensors.dht22 import TemperatureHumiditySensor
+from gs.classes.sensors.moisture_sensor import MoistureSensor
+
+
+class GrowSystem:
+    
+    version = "1.0"
+    
+    initial_config = None
+    
+    device_info = DeviceInfo()
+    
+    sensors = []
+    
+    def __init__(self):
+        print("Initialize Growsystem", self.version)
+        
+        if not self._is_initial_config_existing():
+            print("No config existing. Start setup ...")
+            self._setup()
+            return
+        
+        from gs.grow_system_api import GrowSystemApi as GSA
+        self.gsapi = GSA()
+        
+        if self._is_config_existing():
+            print("Skip Setup. Config existing.")
+            self._initialize_sensors()
+        elif self._is_initial_config_existing():
+            print("Initial config only existing (no base config). Start activation ...")
+            self._activate()
+    
+    def start(self):
+        self.sensor_data_manager = SensorDataManager(self.device_info.get_device_id())
+        
+        print("Start reading sensors ...")
+        
+        read_secs = self.device_info.app_config().read_secs
+        
+        while True:
+            # Reset data
+            self.most_recent_values = []
+            
+            for sensor in self.sensors:
+                print("Read sensor of type " + sensor.type + " at pin " + str(sensor.sensor_pin_int))
+                sensor.read()
+                for measurement in sensor.most_recent_values:
+                    print(f"Got {measurement['value']} {measurement['unit']} ({measurement['type']})")
+                self.most_recent_values = self.most_recent_values + sensor.most_recent_values
+
+            self.sensor_data_manager.handleData(self.most_recent_values)
+            
+            time.sleep(read_secs)
+
+    def _setup(self):
+        setup = Setup()
+        setup.setup_pico()
+        machine.reset
+        
+    def _activate(self):
+        print("Start activation!")
+        import gs.config.initial_config as ic
+        self.initial_config = ic.config
+        device_config = self.gsapi.activate(self.initial_config)
+        #print("Device Config:", device_config['data'])
+
+        if True:
+            sensors = device_config['data']['sensors']
+            sensor_configs = []
+            for sensor in sensors:
+                sensor_configs.append(sensor['config'])
+                print(sensor['config'])
+            device_configs = {
+                'name': device_config['data']['name'],
+                'device_id': device_config['data']['id'],
+                'token': device_config['data']['token'],
+                'user_id': device_config['data']['user_id'],
+                'sensors': sensor_configs
+                }
+            with open("/gs/config/device_config.json", "w") as f:
+                f.write(ujson.dumps(device_configs))
+            if self._is_config_existing():
+                machine.reset
+        
+    def _is_config_existing(self):
+        return self._is_file_existing('/gs/config/device_config.json')
+    
+    def _is_initial_config_existing(self):
+        return self._is_file_existing('/gs/config/initial_config.py')
+        
+    def _is_file_existing(self, filepath):
+        try:
+            f = open(filepath, "r")
+            f.close()
+            # continue with the file.
+            return True
+        except OSError:  # open failed
+           # handle the file open cas
+            return False
+        
+    def _initialize_sensors(self):
+        # Init sensors
+        sensors = self.device_info.config()['sensors']
+        for sensor in sensors:
+            print("--------------------------------------")
+            print("Initialize sensor:")
+            print(sensor)
+            sensor_type = sensor['type']
+            if sensor_type == 'moisture':
+                print("Found sensor of type moisture")
+                self.sensors.append(MoistureSensor(sensor))
+            elif sensor_type == 'dht22':
+                print("Found sensor of type DHT22")
+                self.sensors.append(TemperatureHumiditySensor(sensor))
+            elif sensor_type == 'ambilight':
+                print("Found sensor of type GY302/BH1750")
+                self.sensors.append(AmbilightSensor(sensor))
+            else:
+                print("No sensor type configured for: " + sensor['type'])
+                
+
diff --git a/gs/http_client.py b/gs/http_client.py
new file mode 100644
index 0000000..b819ff8
--- /dev/null
+++ b/gs/http_client.py
@@ -0,0 +1,36 @@
+import urequests
+import json
+
+class HTTPClient:
+    def __init__(self):
+        pass
+
+    def get(self, url):
+        url = 'https://' + url
+        try:
+            # headers = {'Content-Type': 'application/json'}
+            response = urequests.get(url)
+            if response.status_code == 200:
+                print("Data sent, got response")
+                return response
+            else:
+                print("Failed to get data. Status code:", response.status_code)
+        except Exception as e:
+            print("Exception occurred:", e)
+            
+    def post(self, url, data):
+        url = 'https://' + url
+        try:
+            headers = {'Content-Type': 'application/json', 'Accept': 'application/json, text/plain, */*'}
+            json_data = json.dumps(data)
+            print("Send post request to: " + url)
+            response = urequests.post(url, data=json_data, headers=headers)
+            if response.status_code == 200:
+                print("Request OK (200)")
+            else:
+                print("Failed to send data.", response.status_code, response.text)
+            return response
+        except Exception as e:
+            print("Exception raised:", e)
+            return None
+            
diff --git a/gs/little_apache.py b/gs/little_apache.py
new file mode 100644
index 0000000..774a383
--- /dev/null
+++ b/gs/little_apache.py
@@ -0,0 +1,111 @@
+import socket
+from gs.classes.http_request import HttpRequest
+
+
+class LittleApache():
+    
+    available_wifis = []
+    keep_webserver_alive = True
+    
+    
+    def __init__(self, net):
+        self.net = net
+        addr = socket.getaddrinfo('0.0.0.0', 80)[0][-1]
+        self.s = socket.socket()
+        self.s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        self.s.bind(addr)
+        self.s.listen()
+        # print('Listening on', addr)
+        
+    def start(self):
+        print("Webserver started. Connect to: " + self.net.ifconfig()[0])
+        print(self.net.ifconfig())
+        
+        while self.keep_webserver_alive:
+            try:
+                conn, addr = self.s.accept()
+                #print('Got a connection from', addr)
+                
+                # Receive and parse the request
+                request = conn.recv(1024)
+                # print("Request (RAW)", request)
+                http_request = HttpRequest(request)
+                self.http_request = http_request
+                request = str(request)
+                # print('Request content = %s' % request)
+                #try:
+                #    request = request.split()[1]
+                #    print('Request:', request)
+                #except IndexError:
+                #    pass
+                response = self.response(http_request)  
+                # Send the HTTP response and close the connection
+                conn.send('HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n')
+                conn.send(response)
+                conn.close()
+            except OSError as e:
+                conn.close()
+                print('Connection closed')
+        return self
+            
+    def response(self, request: HttpRequest):
+        #print("Webpage: ", request)
+        print("Request method: ", request.method, "Request path: ", request.path)
+        
+        header = f"""
+            <!DOCTYPE html>
+            <html>
+            <head>
+                <title>Growsystem</title>
+                <meta name="viewport" content="width=device-width, initial-scale=1">
+            </head>
+            <body>
+            """
+        
+        footer = f"""
+            </body>
+            </html>
+            """
+        
+        body = ""
+        
+        if self.is_path_match(request, '/test1'):
+            body = f"""
+            <div>Test 1!!!</div>
+            """
+        elif (self.is_path_match(request, '') or self.is_path_match(request, '/')):        
+            options = []    
+            for w in self.available_wifis:
+                options.append('<option value="{}">{}</option>'.format(w, w))  
+            body = """
+            <h1>Setup Pico</h1>
+        <form method="post" action="save">
+        SSID: <select name="ssid">{}</select><br>
+        Password: <input type="password" name="password"><br><br>
+        ID: <input type="number" name="user_id"/><br/>
+        PIN: <input type="number" name="pin" maxlength="4"><br>
+        <input type="submit" value="Submit">
+        </form>            
+            """
+            body = body.format(''.join(options))
+        elif self.is_path_match(request, '/save', 'POST'):
+            print("Save config path: ", request)
+            self.keep_webserver_alive = False
+            body = """
+            <h1>Setup Pico</h1>
+            <div>Setup abgeschlossen. Bitte ein paar Sekunden warten, dann neu starten.</div>          
+            """
+        else:
+            body = f"""
+            <div>Unknown page</div>
+            """
+        
+        html = ''
+        html_arr = [header, body, footer]
+        html = html.join(html_arr)
+        return str(html)
+    
+    def is_path_match(self, request, path, method='GET'):
+        return path == request.path and method == request.method
+
+            
diff --git a/gs/sensor_data_manager.py b/gs/sensor_data_manager.py
new file mode 100644
index 0000000..806870e
--- /dev/null
+++ b/gs/sensor_data_manager.py
@@ -0,0 +1,24 @@
+from gs.grow_system_api import GrowSystemApi
+# from device_info import DeviceInfo
+from gs.exceptions.not_subscriptable_error import NotSubscriptableError
+
+class SensorDataManager:
+    
+    device_info = None
+    
+    grow_system_api = None
+    
+    device_id = None
+    
+    def __init__(self, device_id):
+        self.grow_system_api = GrowSystemApi()
+        # self.device_info = DeviceInfo()
+        self.device_id = device_id
+            
+    def handleData(self, data):
+        json_response = self.grow_system_api.send_measurements(self.device_id, data)
+        try:
+            print("Response message: " + json_response['message'])
+        except TypeError as e:
+            print("The response is no json data", e, json_response)
+
diff --git a/gs/setup.py b/gs/setup.py
new file mode 100644
index 0000000..fd5fea9
--- /dev/null
+++ b/gs/setup.py
@@ -0,0 +1,85 @@
+import network
+import ujson
+import ure as re
+import usocket as socket
+import time
+from gs.little_apache import LittleApache
+
+
+class Setup:
+    
+    wlans = []
+        
+    def __init__(self):
+        self.ap_ssid = "Growsystem  1.0"
+        self.ap_password = "password"
+        self.wlans = []
+        self.selected_ssid = ""
+        self.wlan_password = ""
+        self.pin = ""
+
+    def scan_wlans(self):
+        print("Scan for WiFis")
+        wlan = network.WLAN(network.STA_IF)
+        wlan.active(True)
+        self.wlans = [w[0].decode() for w in wlan.scan()]
+        print("Detected WiFis: ", self.wlans)
+        wlan.active(False)
+
+    def start_ap_mode(self):
+        wlan = network.WLAN(network.STA_IF)
+        wlan.active(False)
+        wlan_config = {
+            "ssid": self.ap_ssid,
+            "pw": self.ap_password
+            }
+        print("Switch to ap mode with data:", wlan_config)
+        ap = network.WLAN(network.AP_IF)
+        ap.config(essid=self.ap_ssid, password=self.ap_password)
+        ap.active(True)
+        self.net = ap
+        print("Connect with your browser to:", ap.ifconfig()[0])
+
+    def stop_ap_mode(self):
+        print("Stop ap mode")
+        ap = network.WLAN(network.AP_IF)
+        ap.active(False)
+
+    def get_initial_config_webserver(self):
+        self.la = LittleApache(self.net)
+        self.la.available_wifis = self.wlans
+        self.la.start()
+        config = self.la.http_request.get_content_json()
+        print("start webserver end:", config)
+        return config
+
+    def save_config(self, config):
+        config = {
+            "ssid": config['ssid'],
+            "password": config['password'],
+            "pin": config['pin'],
+            "user_id": config['user_id']
+        }
+        print("Save initial config:", config)
+        with open("/gs/config/initial_config.py", "w") as f:
+            f.write("config = " + ujson.dumps(config))
+
+    def switch_to_client_mode(self):
+        print("Switch to client mode")
+        ap = network.WLAN(network.AP_IF)
+        ap.active(False)
+        wlan = network.WLAN(network.STA_IF)
+        wlan.active(True)
+        wlan.connect(self.selected_ssid, self.wlan_password)
+        while not wlan.isconnected():
+            time.sleep(1)
+        print("Connected to", self.selected_ssid)
+
+    def setup_pico(self):
+        self.scan_wlans()
+        self.start_ap_mode()
+        config = self.get_initial_config_webserver()
+        self.save_config(config)
+        # self.stop_ap_mode()
+        # self.switch_to_client_mode()
+
diff --git a/wlan.py b/gs/wlan_client.py
similarity index 99%
rename from wlan.py
rename to gs/wlan_client.py
index c265d8e..723832f 100644
--- a/wlan.py
+++ b/gs/wlan_client.py
@@ -37,3 +37,4 @@ class WlanClient:
 
     def is_connected(self):
         return self.wlan.isconnected()
+
diff --git a/lib/bh1750.py b/lib/bh1750.py
index 0f91b49..e155a09 100644
--- a/lib/bh1750.py
+++ b/lib/bh1750.py
@@ -59,4 +59,4 @@ class BH1750():
         sleep_ms(24 if mode in (0x13, 0x23) else 180)
         data = self.bus.readfrom(self.addr, 2)
         factor = 2.0 if mode in (0x11, 0x21) else 1.0
-        return (data[0]<<8 | data[1]) / (1.2 * factor)
\ No newline at end of file
+        return (data[0]<<8 | data[1]) / (1.2 * factor)
diff --git a/main.py b/main.py
index 241af6c..ae2ca15 100644
--- a/main.py
+++ b/main.py
@@ -1,57 +1,13 @@
-# GrowSystem
-# Author: Maik Müller (maik@muelleronlineorg)
-
-# WIP!
-# This file should do only:
-# - provide constants for settings
-# - eventually necessary system settings
-# - init wlan connection
-# - Call base class, permitting the configured constants
-import network
-import urequests
-from grow_system import GrowSystem
-from wlan import WlanClient
-from http_client import HTTPClient
-from device_info import DeviceInfo
+## Only start grow system
+from gs.growsystem import GrowSystem
+from time import sleep
 
 
-settings = {
-    'wlan_ssid': 'Oppa-95.lan',
-    'wlan_pw': '95%04-MM',
-    'moisture_sensor': {
-        'pin_int': 26
-    },
-    'temperature_humidity_sensor': {
-        'pin_int': 15
-    },
-    'pump_pin_int': 24
-}
-
-
-def wlan_scan():
-    # Client-Betrieb
-    wlan = network.WLAN(network.STA_IF)
-    # WLAN-Interface aktivieren
-    wlan.active(True)
-    # WLANs ausgeben
-    found_wlans = wlan.scan()
-    return found_wlans
-
-
-# Press the green button in the gutter to run the script.
 if __name__ == '__main__':
-    #print(wlan_scan())
-    print("Connect WLAN")
-    wlanClient = WlanClient(settings['wlan_ssid'], settings['wlan_pw'])
-    wlanClient.connect()
-    print("")
-    
-    di = DeviceInfo()
-    print("Device Infos:")
-    print(di.get_all_device_infos())
-    print("")
-    
-    print("Start grow system")
-    gs = GrowSystem(settings)
+    gs = GrowSystem()
     gs.start()
-
+    
+    while True:
+        print("Keep running in main.py")
+        sleep(5)
+        
\ No newline at end of file
diff --git a/notes/code_sample_moisture_sensor.txt b/notes/code_sample_moisture_sensor.txt
deleted file mode 100644
index 64a5eaf..0000000
--- a/notes/code_sample_moisture_sensor.txt
+++ /dev/null
@@ -1,31 +0,0 @@
-from machine import Pin, ADC
-import time
-import network
-import urequests
-import statistics
-import secrets
-sensor = ADC(Pin(26))
-wlan = network.WLAN(network.STA_IF)
-wlan.active(True)
-wlan.connect(secrets.SSID, secrets.PASSWORD)
-time.sleep(5)
-print(wlan.isconnected())
-readings = []
-try:
-   while True:
-       for i in range(5):
-           reading = sensor.read_u16()
-           readings.append(reading)
-           print(readings)
-           time.sleep(1)
-       median_value = statistics.median(readings)
-       if median_value < 400:
-           urequests.get("https://api.telegram.org/bot"+secrets.API+"/sendMessage?text=Gary is thirsty&chat_id="+secrets.ID)
-           print("Message Sent")
-       else:
-           print("Gary has enough water")
-       time.sleep(3600)
-except OSError:
-   print("@"*68)
-   print("@ Cannot connect to the Wi-Fi, please check your SSID and PASSWORD @")
-print("@"*68)
\ No newline at end of file
diff --git a/sensor_data_manager.py b/sensor_data_manager.py
deleted file mode 100644
index 87dbf39..0000000
--- a/sensor_data_manager.py
+++ /dev/null
@@ -1,20 +0,0 @@
-from grow_system_api import GrowSystemApi
-# from device_info import DeviceInfo
-
-
-class SensorDataManager:
-    
-    device_info = None
-    
-    grow_system_api = None
-    
-    device_id = None
-    
-    def __init__(self, device_id):
-        self.grow_system_api = GrowSystemApi()
-        # self.device_info = DeviceInfo()
-        self.device_id = device_id
-            
-    def handleData(self, data):
-        jsonResponse = self.grow_system_api.send_measurements(self.device_id, data)
-        print("Response message: " + jsonResponse['message'])
\ No newline at end of file