Add a DHT11+MQ135 example

mq135_dht11_example.py

@@ -0,0 +1,28 @@
+import time
+from dht import DHT11
+from machine import Pin
+from MQ135 import MQ135
+
+
+# setup
+mq135 = MQ135(0) # analog PIN 0
+dht11 = DHT11(Pin(4)) # D2
+
+# loop
+while True:
+
+    dht11.measure()
+    temperature = dht11.temperature()
+    humidity = dht11.humidity()
+
+    rzero = mq135.get_rzero()
+    corrected_rzero = mq135.get_corrected_rzero(temperature, humidity)
+    resistance = mq135.get_resistance()
+    ppm = mq135.get_ppm()
+    corrected_ppm = mq135.get_corrected_ppm(temperature, humidity)
+
+    print("DHT11 Temperature: " + str(temperature) +"\t Humidity: "+ str(humidity))
+    print("MQ135 RZero: " + str(rzero) +"\t Corrected RZero: "+ str(corrected_rzero)+
+          "\t Resistance: "+ str(resistance) +"\t PPM: "+str(ppm)+
+          "\t Corrected PPM: "+str(corrected_ppm)+"ppm")
+    time.sleep(1)