projektarbeit_duelger_waldhauser_caliskan/software/roboter/raspy/raspy_sensors.py

# from picamera import PiCamera
import adafruit_dht
import adafruit_tsl2561
import board
import json
from defines import SENSORDATA


def readDHT22(): 
    """
    Reads DHT22 air temperature and air humidity and return values as float

    Raises:
        Exception: If DHT22 not connected properly

    Returns:
        float: air temperature in °C
        float: air humidity %
    """
    try:
        dht22 = adafruit_dht.DHT22(board.D4, use_pulseio=False)
    except:
        raise Exception("DHT22 not connected")
    
    # read DHT22
    try:
        temperature = dht22.temperature
        humidity = dht22.humidity
    except:
        raise Exception("DHT22 not connected")

    return temperature, humidity


def readTSL2561():
    """
    Reads TSL2561 brightness in Lux

    Raises:
        Exception: If TSL2561 not connected properly

    Returns:
        int: brightness in Lux
    """
    try:
        tsl2561 = adafruit_tsl2561.TSL2561(board.I2C())
    except:
        raise Exception("TSL2561 not connected")
    
    # read TSL2561
    brightness = 0
    if type(tsl2561.lux) == type(None):  # Max Value 40.000 -> above error
        brightness = 40000
    else:
        brightness = int(tsl2561.lux)

    return brightness



# TODO SoilMoisture Sensor Function


# TODO Function for all sensors
def readSensors():
    """
    Read DHT22, TSL2561 and Humidity Sensor

    Raises:
        Exception: DHT22 not connected
        Exception: TSL2561 not connected

    Returns:
        dict: Sensordata
    """
    sensorData = SENSORDATA
    errorMessage = ""

    try:
        sensorData["AirTemperature"], sensorData["AirHumidity"] = readDHT22()   
    except Exception as e:
        sensorData["AirHumidity"] = 0                   # otherwise old value
        sensorData["AirTemperature"] = 0
        errorMessage = str(e) + "\n"

    try:
        sensorData["Brightness"] = readTSL2561()
    except Exception as e:
        sensorData["Brightness"] = 0                   # otherwise old value
        errorMessage = errorMessage + str(e) + "\n"

    # combined error message
    if errorMessage != "":
        raise Exception(errorMessage)

    return sensorData


# TODO - take picture function
def takePicture():
    """
    Take picture and return picture
    Returns:
        _type_: _description_
    """
    picture = ""

    return picture


# TODO - read position with sensor
def readPosition():
    """
    Read and return Position

    Returns:
        _type_: _description_
     """
    position = ""
    return position


# for Testing only
def main():
    sensors = RaspySensors()
    test = sensors.readSensors()
    print("Data:" + json.dumps(test))


if __name__ == "__main__":
    main()