Command line utility to make a high pulse on relay attach to Rpi GPIO

relay_pulse.py

#!/usr/bin/env python3

# make high pulse on relay attach to Rpi GPIO 
#   see REL_PIN_MAP to fix GPIO pin number

import time
import argparse
import RPi.GPIO as GPIO

# some const
REL_PIN_MAP = [29, 23, 21, 19]
REL_ON = GPIO.LOW
REL_OFF = GPIO.HIGH

# parse args
parser = argparse.ArgumentParser()
parser.add_argument('relay_id', type=int, 
                    choices=range(1, len(REL_PIN_MAP) + 1),
                    help='relay ID')
parser.add_argument('-s', '--size', type=float, default=1.0,
                    help='pulse size in s (default is 1.0)')
args = parser.parse_args()

rel_pin = REL_PIN_MAP[args.relay_id - 1]

# setup
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)
GPIO.setup(rel_pin, GPIO.OUT, initial=REL_OFF)

# make a pulse
GPIO.output(rel_pin, REL_ON)
time.sleep(args.size)
GPIO.output(rel_pin, REL_OFF)