dht22.py

@@ -0,0 +1,32 @@
+from dht import DHT22
+from machine import ADC, Pin
+
+
+class TemperatureHumiditySensor:
+    dht22_sensor_pin_int = -1
+
+    dht22_sensor = None
+
+    most_recent_values = {}
+
+    def __init__(self, settings):
+        print("Hello from dht22 sensor  class")
+        print(settings)
+        self.dht22_sensor_pin_int = settings['pin_int']
+        self.dht22_sensor = DHT22(Pin(self.dht22_sensor_pin_int, Pin.IN, Pin.PULL_UP))
+
+    def read(self):
+        try:
+            self.dht22_sensor.measure()
+            self.most_recent_values = {
+                'temperature': {
+                    'value': self.dht22_sensor.temperature(),
+                    'unit': '°C'},
+                'humidity': {
+                    'value': self.dht22_sensor.humidity(),
+                    'unit': '%'
+                }
+            }
+        except OSError:
+            print('DHT22 Error reading temperature/humidity. Check wires')
+            print()

grow_system.py

@@ -1,10 +1,12 @@
 import time
 from moisture_sensor import MoistureSensor
+from dht22 import TemperatureHumiditySensor
 
 
 class GrowSystem:
 
     moisture_sensor = None
+    temperature_humidity_sensor = None
 
     most_recent_values = {}
 
@@ -14,11 +16,20 @@ class GrowSystem:
         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("Start reading sensors ...")
         while True:
+            # Moisture Sensor
             self.moisture_sensor.read()
             self.most_recent_values['moisture_sensor'] = self.moisture_sensor.most_recent_value
+
+            # Temperature and Humidity Sensor
+            self.temperature_humidity_sensor.read()
+            self.most_recent_values['temperature_humidity_sensor'] = self.temperature_humidity_sensor.most_recent_values
+
             print(self.most_recent_values)
             time.sleep(1)
 

main.py

@@ -11,10 +11,12 @@ from grow_system import GrowSystem
 settings = {
     'wlan_ssid': 'Oppa-95.lan',
     'wlan_pw': '95%04-MM',
-    'led_pin_int': 15,
     'moisture_sensor': {
         'pin_int': 26
     },
+    'temperature_humidity_sensor': {
+        'pin_int': 15
+    },
     'pump_pin_int': 24
 }