jdz/modbus.py

import minimalmodbus
import time, os
import serial
import RPi.GPIO as GPIO
import paho.mqtt.client as mqtt

# MQTT Broker settings

mqttBroker ="65.108.199.212"
myhost = os.uname()[1]
client = mqtt.Client(myhost)
client.connect(mqttBroker, 1883)


# Modbus configuration
mb_address = 1  # Modbus address
sensy_boi = minimalmodbus.Instrument('/dev/ttyUSB0', mb_address)
sensy_boi.serial.baudrate = 9600
sensy_boi.serial.bytesize = 8
sensy_boi.serial.parity = minimalmodbus.serial.PARITY_NONE
sensy_boi.serial.stopbits = 1
sensy_boi.serial.timeout = 0.5
sensy_boi.mode = minimalmodbus.MODE_RTU

# Configure buffer clearing and port closing settings
sensy_boi.clear_buffers_before_each_transaction = True
sensy_boi.close_port_after_each_call = True

# GPIO configuration
GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN)


try:
    while True:
            if GPIO.input(17) == GPIO.HIGH:
                print("Adquiriendo datos...")

                # Read data from multiple registers
                data = sensy_boi.read_registers(0, 2, 3)

                print("")
                print(f"Datos crudos {data}")

                # Process the raw data
                hum = data[0] / 10
                temp = data[1] / 10

                client.publish("iiot/"+ myhost +"/temperature", temp)
                client.publish("iiot/"+ myhost +"/humidity", hum)

                # Print the processed data
                print("-------------------------------------")
                print(f"Temperatura = {temp}\u00B0C")
                print(f"Humedad relativa = {hum}%")
                print("-------------------------------------")
                print("")

            time.sleep(1.5)

except KeyboardInterrupt:
    print("Programa terminado por el usuario")

except Exception as e:
    print(f"Error: {str(e)}")
finally:
    GPIO.cleanup()
    print("Programa finalizado")