Get the temperature and the humidity from a XY-MD02 sensor

xy-md02.py

#!/usr/bin/env python
"""Get the temperature and the humidity from a XY-MD02 sensor."""

from pymodbus.client import ModbusSerialClient as ModbusClient
from pymodbus.constants import Endian
from pymodbus.payload import BinaryPayloadDecoder

SERIAL_PORT = "/dev/ttyUSB0"
BAUDRATE = 9600
SLAVE_ID = 1

client = ModbusClient(method="rtu", port=SERIAL_PORT, baudrate=BAUDRATE)
client.connect()


def read_data(address):
    response = client.read_input_registers(address=address, slave=SLAVE_ID, unit=1)
    if response.isError():
        print(f"Error reading data: {response}")
        return None
    else:
        decoder = BinaryPayloadDecoder.fromRegisters(
            response.registers, byteorder=Endian.BIG
        )
        data = decoder.decode_16bit_int() / 10.0
        return data


if __name__ == "__main__":
    try:
        # Input register 0x0001
        temperature = read_data(1)
        # Input register 0x0002
        humidity = read_data(2)

        if temperature is not None:
            print(f"Temperature: {temperature} °C")
        if humidity is not None:
            print(f"Humidity: {humidity} %")
    finally:
        client.close()