Multi-SNICS_Interlock/serial_relay.py

#!/usr/bin/python

import serial
import RPi.GPIO as GPIO
import time
import random

#Open serial port
ser = serial.Serial('/dev/ttyUSB0',baudrate=9600,timeout =1)

GPIO.setmode(GPIO.BCM)
# init list with pin numbers
pinList = [17]
# loop through pins and set mode and state to 'high'
for i in pinList:
    GPIO.setup(i, GPIO.OUT)

#text file for saving the reading
file_path = '/home/pi03/TRI_reading.txt'

try:
    while True:
        #Read ASCII data from serial port
        data = ser.readline().decode('ascii').strip()
        if data:
            try:
               reading = (int(data[3:8],16)-160)*0.3
               print("Received:", data, ":", data[3:8], "=", int(data[3:8],16),":",round(reading))
               #write to file
               with open(file_path, 'w') as file:
                  file.write(str(float(reading)))
               if reading >50:
                  GPIO.output(17, GPIO.LOW)
                  #print ("ON")
               else:
                  GPIO.output(17, GPIO.HIGH)
                  #print ("OFF")
            except :
               os.putenv('TRI_reading', 'no_data')
except KeyboardInterrupt:
    #Close serial port on Crt+C
    ser.close()
    #print ("Quit")

# Reset GPIO settings
GPIO.cleanup()