Quick python script to dump data from UM25C

um25c.py

#!/usr/bin/python3

import sys, signal, traceback, serial, time

def signal_handler(sig, frame):
    global ser
    print('Ctrl-C, quitting.')
    if ser:
        ser.close()

    sys.exit(0)

signal.signal(signal.SIGINT, signal_handler)
ser = None
if len(sys.argv) < 2:
    print("Usage:", sys.argv[0], "<serial port>")
    sys.exit(1)

try:
    ser = serial.Serial(sys.argv[1], 9600, timeout=3)
except:
    print("Failed to open the serial port.")
    traceback.print_exc()
    sys.exit(1)

while 1:
    ser.write(b'\xf0')
    time.sleep(0.1)
    b = ser.read(130)
    if len(b) <= 0:
        continue

    if b[0] == 0x09 and b[1] == 0xc9:
        voltage = float((b[2] << 8) + b[3]) / 1000.0
        amperage = float((b[4] << 8) + b[5]) / 10000.0
        temperature = float((b[10] << 8) + b[11])

        print(time.time(), ",", voltage, ",", amperage, ",", temperature)

    else:
        print("Invalid device type")
        break

ser.close()