ラズパイに取り付けたタクトスイッチ用のスクリプト

octoprint-buttons.py

#!/usr/bin/env python3

import RPi.GPIO as GPIO
import time
import subprocess
import urllib.request
import json

GPIO_POWER = 3
GPIO_DISABLE_STEPPERS = 20
GPIO_LED = 16

def disable_steppers(channel):
    url = 'http://localhost:5000/api/printer/command'
    json_data = json.dumps({
        'command': 'M18 X Y Z',
    }).encode("utf-8")

    with open('/some/where/api-key') as f:
        api_key = f.read().rstrip()

    req = urllib.request.Request(url)
    req.add_header('X-Api-Key', api_key)
    req.add_header('Content-Type', 'application/json')
    req.data = json_data

    with urllib.request.urlopen(req) as f:
        buff = f.read().decode()

GPIO.setmode(GPIO.BCM)

GPIO.setup(GPIO_POWER,            GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(GPIO_DISABLE_STEPPERS, GPIO.IN, pull_up_down=GPIO.PUD_UP)

GPIO.add_event_detect(GPIO_DISABLE_STEPPERS, GPIO.FALLING,
        callback=disable_steppers, bouncetime=2000)

# LED 点灯
GPIO.setup(GPIO_LED, GPIO.OUT)
GPIO.output(GPIO_LED, GPIO.HIGH)

while True:
    GPIO.wait_for_edge(GPIO_POWER, GPIO.FALLING)
    sw_counter = 0

    while True:
        sw_status = GPIO.input(GPIO_POWER)
        if sw_status == 0:
            sw_counter = sw_counter + 1
            if sw_counter >= 50:
                # long press of the button
                #print('long press')

                # LED 点滅
                GPIO.output(GPIO_LED, GPIO.LOW)
                time.sleep(0.5)
                GPIO.output(GPIO_LED, GPIO.HIGH)

                subprocess.run(['shutdown', '-h', 'now'])

                break
        else:
            # short press of the button
            # print('short press')
            break

        time.sleep(0.01)