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sensors.py

@@ -0,0 +1,40 @@
+import smbus2
+import bme280
+import time
+
+# I2C bus ini initialisieren
+bus = smbus2.SMBus(1)
+
+class EnvironmentSensor:
+    def __init__(self, addr):
+        self.addr = addr
+
+    def temperature(self):
+        return bme280.sample(bus, self.addr).temperature
+    def humidity(self):
+        return bme280.sample(bus, self.addr).humidity
+    def pressure(self):
+        return bm2280.sample(bus, self.addr).pressure
+
+env=[EnvironmentSensor(0x76), EnvironmentSensor(0x77)]
+
+lightMeasurementTime=0.2
+
+def readBH1750(bus, addr = 0x23):
+    bus.write_byte(addr, 0x01) # power on 
+    bus.write_byte(addr, 0x20) # set high res onetime measurement mode
+    time.sleep(lightMeasurementTime) # 0.1 should already be enough time for measurement
+    data = bus.read_i2c_block_data(addr, 0, 2) # get measurement result
+    return ((data[0] << 8) + data[1]) / 1.2 # factor 1.2 is from sensor datasheet
+
+
+def illuminance():
+    return readBH1750(bus)
+
+def environment(sensor):
+    if sensor == 0:
+        return bme280.sample(bus, 0x76)
+    elif sensor == 1:
+        return bme280.sample(bus, 0x77)
+    else:
+        raise ValueError