red_alert.py

import requests
import schedule
import time
import RPi.GPIO as GPIO

HTTP_PREFIX = 'http://'
BRIDGE_IP = '192.168.178.101'
API_PREFIX = '/api'
USERNAME = 'x-M0aZsE-oQVjKTpmv8EfbUKXcIW7S8kTXvX3Mlb'
GROUPS = '/groups'
ACTION = '/action'

BRI_MAX = 254
SAT_MAX = 254
SAT_MIN = 100
HUE_RED = 0
RED_PULSING = {
    'on': True,
    'effect': 'none',
    'hue': HUE_RED,
    'sat': SAT_MAX,
    'bri': BRI_MAX,
    'alert': 'lselect'
}
NORMAL = {
    'effect': 'none',
    'sat': SAT_MIN,
    'bri': BRI_MAX,
}
PIN_SWITCH = 23

def authenticated():
    return HTTP_PREFIX + BRIDGE_IP + API_PREFIX + '/' + USERNAME


def address_to_all():
    return GROUPS + '/0' + ACTION


def refresh():
    response = requests.put(authenticated() + address_to_all(), json=RED_PULSING)
    print(response.url)
    print(response.text)
def terminate():
    response = requests.put(authenticated() + address_to_all(), json=NORMAL)
    print(response.url)
    print(response.text)

def trigger_red_alert():
    # First turn on all lamps.
    refresh()
    # Then get it going.
    refresh()
    # Repeat every 15 seconds.
    schedule.every(15).seconds.do(refresh)
    while True:
        if GPIO.input(PIN_SWITCH) == 0:
            break
        schedule.run_pending()
        time.sleep(1)

GPIO.setmode(GPIO.BCM)
GPIO.setup(PIN_SWITCH, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
GPIO.add_event_detect(PIN_SWITCH, GPIO.RISING, callback=trigger_red_alert, bouncetime=300)
GPIO.add_event_detect(PIN_SWITCH, GPIO.FALLING, callback=terminate, bouncetime=300)