#!/usr/bin/env python3 from time import sleep,time from sys import exit import minimalmodbus import serial slave_address = 254 instrument = minimalmodbus.Instrument('/dev/rs485', slave_address, close_port_after_each_call=True) # port name, slave address (in decimal) instrument.serial.baudrate = 19200 instrument.serial.bytesize = 8 instrument.serial.parity = serial.PARITY_EVEN instrument.serial.stopbits = 1 instrument.serial.timeout = 0.05 # seconds instrument.mode = minimalmodbus.MODE_RTU # rtu or ascii mode instrument.clear_buffers_before_each_transaction = True # log file log_file = 'measurement.csv' # read while True: CO2_addr = 9 CO2 = instrument.read_register(CO2_addr, 1, functioncode=4) * 10 T_SHT4x_addr = 10 T_SHT4x = instrument.read_register(T_SHT4x_addr, 1, functioncode=4) RH_SHT4x_addr = 11 RH_SHT4x = instrument.read_register(RH_SHT4x_addr, 1, functioncode=4) * 10 T_SCD4x_addr = 12 T_SCD4x = instrument.read_register(T_SCD4x_addr, 1, functioncode=4) RH_SCD4x_addr = 13 RH_SCD4x = instrument.read_register(RH_SCD4x_addr, 1, functioncode=4) * 10 T_SHT4x_signed_addr = 14 T_SHT4x_signed = instrument.read_register(T_SHT4x_signed_addr, 1, functioncode=4, signed=True) T_SCD4x_signed_addr = 15 T_SCD4x_signed = instrument.read_register(T_SCD4x_signed_addr, 1, functioncode=4, signed=True) with open(log_file, 'a+') as f: f.write(f'{int(time())} {CO2} {T_SHT4x} {RH_SHT4x} {T_SCD4x} {RH_SCD4x} {T_SHT4x_signed} {T_SCD4x_signed}\n') sleep(10)