Initial commit. Includes DHT22 and PushButton.

dht22/print_DHT22.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+
+import RPi.GPIO as GPIO
+import adafruit_dht
+import time
+from datetime import datetime
+
+
+def get_sensor_data(dht22):
+    try:
+        temperature = 9./5. * dht22.temperature + 32.
+        humidity = dht22.humidity
+        return temperature, humidity
+    except RuntimeError as e:
+        print("Reading from DHT failure: ", e.args)
+        return None    
+
+if __name__ == "__main__":
+
+    # Setup for Hardware
+    DHT22_PIN = 4
+    dht_device = adafruit_dht.DHT22(4)
+    file = '/home/pi/code/dht22/log.csv'
+    
+    with open(file,'a') as f:
+
+        try:
+            while True:
+                data = get_sensor_data(dht22=dht_device)
+                if data:
+                    temperature, humidity = get_sensor_data(dht22=dht_device)
+                    current_time = datetime.now().strftime("%H:%M:%S")
+                    print(f'{humidity:.2f}%    {temperature:.2f}degF')
+                    f.write(f'{current_time},{humidity:.2f},{temperature:.2f}\n') 
+                    time.sleep(60)
+                else:
+                    time.sleep(0.1)
+
+        finally:
+            GPIO.cleanup()