diff --git a/REDME.md b/REDME.md
new file mode 100644
index 0000000..bc52edf
--- /dev/null
+++ b/REDME.md
@@ -0,0 +1,3 @@
+# Show output on terminal #
+`minicom -b 115200 -o -D /dev/cu.usbmodem3301`
+
diff --git a/ambilight_sensor.py b/ambilight_sensor.py
new file mode 100644
index 0000000..c8f0a3c
--- /dev/null
+++ b/ambilight_sensor.py
@@ -0,0 +1,34 @@
+from sensors import Sensors
+from machine import Pin, I2C
+from utime import sleep
+from lib.bh1750 import BH1750
+
+
+class AmbilightSensor(Sensors):
+
+
+    most_recent_values = []
+
+    def __init__(self, settings):
+        super().__init__(settings)
+        print(settings) # TODO remove
+        self.sensor_pin_int = settings['pin_int']
+        # self.sensor = DHT22(Pin(self.sensor_pin_int, Pin.IN, Pin.PULL_UP))
+        self.sensor = BH1750(I2C(0, sda=Pin(settings['pin_int_sda']), scl=Pin(settings['pin_int_scl'])))
+
+    def read(self):
+        try:
+            measurement = self.sensor.luminance(BH1750.ONCE_HIRES_1)
+            print("ambilight ..")
+            print(measurement)
+            self.most_recent_values = [
+                {
+                    'type': 'ambilight',
+                    'value': measurement,
+                    'unit': '-'
+                },
+            ]
+        except OSError:
+            print('Ambilight Error reading temperature/humidity. Check wires')
+            print()
+
diff --git a/bh1750.old_1/__init__.py b/bh1750.old_1/__init__.py
new file mode 100644
index 0000000..ab5e217
--- /dev/null
+++ b/bh1750.old_1/__init__.py
@@ -0,0 +1 @@
+from .bh1750 import BH1750
diff --git a/bh1750.old_1/bh1750.py b/bh1750.old_1/bh1750.py
new file mode 100644
index 0000000..21cebbe
--- /dev/null
+++ b/bh1750.old_1/bh1750.py
@@ -0,0 +1,118 @@
+# 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
new file mode 100644
index 0000000..65ab51a
--- /dev/null
+++ b/device_info.py
@@ -0,0 +1,62 @@
+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/dht22.py b/dht22.py
new file mode 100644
index 0000000..c022666
--- /dev/null
+++ b/dht22.py
@@ -0,0 +1,36 @@
+from sensors import Sensors
+from dht import DHT22
+from machine import ADC, Pin
+
+
+class TemperatureHumiditySensor(Sensors):
+
+    sensor = None
+
+    most_recent_values = []
+
+    def __init__(self, settings):
+        super().__init__(settings)
+        print("Initialize dht22 sensor. Sensor pin is: " + str(settings['pin_int']))
+        print(settings)
+        self.sensor_pin_int = settings['pin_int']
+        self.sensor = DHT22(Pin(self.sensor_pin_int, Pin.IN, Pin.PULL_UP))
+
+    def read(self):
+        try:
+            self.sensor.measure()
+            self.most_recent_values = [
+                {
+                    'type': 'temperature',
+                    'value': self.sensor.temperature(),
+                    'unit': 'C'
+                },
+                {
+                    'type': 'humidity',
+                    'value': self.sensor.humidity(),
+                    'unit': '%'
+                }
+            ]
+        except OSError:
+            print('DHT22 Error reading temperature/humidity. Check wires')
+            print()
diff --git a/grow_system.py b/grow_system.py
new file mode 100644
index 0000000..3528ea9
--- /dev/null
+++ b/grow_system.py
@@ -0,0 +1,78 @@
+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
new file mode 100644
index 0000000..0e3376c
--- /dev/null
+++ b/grow_system_api.py
@@ -0,0 +1,31 @@
+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/http_client.py b/http_client.py
new file mode 100644
index 0000000..fd197ed
--- /dev/null
+++ b/http_client.py
@@ -0,0 +1,35 @@
+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:
+                return response
+            else:
+                print("Failed to send data. Status code:", response.status_code)
+                print(response.text)
+        except Exception as e:
+            print("Exception occurred:", e)
+            
diff --git a/lib/bh1750.py b/lib/bh1750.py
new file mode 100644
index 0000000..0f91b49
--- /dev/null
+++ b/lib/bh1750.py
@@ -0,0 +1,62 @@
+"""
+Micropython BH1750 ambient light sensor driver.
+* https://github.com/PinkInk/upylib/tree/master/bh1750
+"""
+
+from utime import sleep_ms
+
+
+class BH1750():
+    """Micropython BH1750 ambient light sensor driver."""
+
+    PWR_OFF = 0x00
+    PWR_ON = 0x01
+    RESET = 0x07
+
+    # modes
+    CONT_LOWRES = 0x13
+    CONT_HIRES_1 = 0x10
+    CONT_HIRES_2 = 0x11
+    ONCE_HIRES_1 = 0x20
+    ONCE_HIRES_2 = 0x21
+    ONCE_LOWRES = 0x23
+
+    # default addr=0x23 if addr pin floating or pulled to ground
+    # addr=0x5c if addr pin pulled high
+    def __init__(self, bus, addr=0x23):
+        self.bus = bus
+        self.addr = addr
+        self.off()
+        self.reset()
+
+    def off(self):
+        """Turn sensor off."""
+        self.set_mode(self.PWR_OFF)
+
+    def on(self):
+        """Turn sensor on."""
+        self.set_mode(self.PWR_ON)
+
+    def reset(self):
+        """Reset sensor, turn on first if required."""
+        self.on()
+        self.set_mode(self.RESET)
+
+    def set_mode(self, mode):
+        """Set sensor mode."""
+        self.mode = mode
+        self.bus.writeto(self.addr, bytes([self.mode]))
+
+    def luminance(self, mode):
+        """Sample luminance (in lux), using specified sensor mode."""
+        # continuous modes
+        if mode & 0x10 and mode != self.mode:
+            self.set_mode(mode)
+        # one shot modes
+        if mode & 0x20:
+            self.set_mode(mode)
+        # earlier measurements return previous reading
+        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
diff --git a/main.py b/main.py
index 94e3a87..241af6c 100644
--- a/main.py
+++ b/main.py
@@ -1,16 +1,57 @@
-# This is a sample Python script.
+# GrowSystem
+# Author: Maik Müller (maik@muelleronlineorg)
 
-# Press ⌃R to execute it or replace it with your code.
-# Press Double ⇧ to search everywhere for classes, files, tool windows, actions, and settings.
+# 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
 
 
-def print_hi(name):
-    # Use a breakpoint in the code line below to debug your script.
-    print(f'Hi, {name}')  # Press ⌘F8 to toggle the breakpoint.
+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_hi('PyCharm')
+    #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.start()
 
-# See PyCharm help at https://www.jetbrains.com/help/pycharm/
diff --git a/moisture_sensor.py b/moisture_sensor.py
new file mode 100644
index 0000000..e11ca76
--- /dev/null
+++ b/moisture_sensor.py
@@ -0,0 +1,39 @@
+# Moisture Sensor Class
+from sensors import Sensors
+from machine import ADC, Pin
+
+
+class MoistureSensor(Sensors):
+    
+    sensor = None
+
+    most_recent_values = []
+    
+    min_raw_value = None
+    max_raw_value = None
+
+    def __init__(self, sensor_data, min_raw_value=300, max_raw_value=65535):
+        super().__init__(sensor_data)
+        print("Initialize moisture sensor. Sensor pin is: " + str(sensor_data['pin_int']))
+        self.sensor_pin_int = sensor_data['pin_int']
+        self.min_raw_value = min_raw_value
+        self.max_raw_value = max_raw_value
+        self.sensor = ADC(Pin(self.sensor_pin_int))
+
+    def read(self):
+        self.most_recent_values = [
+            {
+                'type': 'moisture',
+                'value': self.convert_to_moisture_percentage(self.sensor.read_u16()),
+                'unit': '%'
+            },
+        ]
+
+    def normalize_sensor_value(self, raw_value):
+        return (raw_value - self.min_raw_value) / (self.max_raw_value - self.min_raw_value)
+
+    def convert_to_moisture_percentage(self, raw_value):
+        normalized_value = self.normalize_sensor_value(raw_value)
+        return round(100 - normalized_value * 100, 1)
+    
+    
\ No newline at end of file
diff --git a/notes/code_sample_moisture_sensor.txt b/notes/code_sample_moisture_sensor.txt
new file mode 100644
index 0000000..64a5eaf
--- /dev/null
+++ b/notes/code_sample_moisture_sensor.txt
@@ -0,0 +1,31 @@
+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
new file mode 100644
index 0000000..87dbf39
--- /dev/null
+++ b/sensor_data_manager.py
@@ -0,0 +1,20 @@
+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
diff --git a/sensors.py b/sensors.py
new file mode 100644
index 0000000..23ad803
--- /dev/null
+++ b/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']))
+    
+    
\ No newline at end of file
diff --git a/wlan.py b/wlan.py
new file mode 100644
index 0000000..c265d8e
--- /dev/null
+++ b/wlan.py
@@ -0,0 +1,39 @@
+import machine
+import network
+import time
+# network.country('DE')
+
+
+class WlanClient:
+
+    ssid = ''
+    pw = ''
+    wlan = None
+    # Status-LED
+    led_onboard = machine.Pin('LED', machine.Pin.OUT)
+    led_onboard.value(False)
+
+    def __init__(self, ssid, pw):
+        # print("Hello from wlan class")
+        self.ssid = ssid
+        self.pw = pw
+        self.wlan = network.WLAN(network.STA_IF)
+
+    def connect(self):
+        if not self.is_connected():
+            print('No WLAN connected. Connecting ...' + self.ssid + ' ' + self.pw)
+            self.wlan.active(True)
+            self.wlan.connect(self.ssid, self.pw)
+            for i in range(10):
+                if self.wlan.status() < 0 or self.wlan.status() >= 3:
+                    break
+                time.sleep(1)
+                # led_value = self.led_onboard.value() == 1
+                # self.led_onboard.value(led_value)
+        if self.wlan.isconnected():
+            net_config = self.wlan.ifconfig()
+            print("NetConfig:")
+            print(net_config)
+
+    def is_connected(self):
+        return self.wlan.isconnected()