A discord bot that reports changes to a pin on the RaspberryPi GPIO (used for detecting door knocks via a SW-420 Vibration Switch). Python 3.7.0

doormon.py

import discord
import asyncio
import RPi.GPIO as GPIO
import traceback

from discord.ext import commands

TOKEN = 'BOT_TOKEN_HERE'

description = '''A bot that reports changes to a pin on the GPIO'''

client = discord.Client()

sensor_pin = 14

GPIO.setmode(GPIO.BCM)
GPIO.setup(sensor_pin,GPIO.IN)

async def check_door(channel):
    await client.wait_until_ready()
    last_value = GPIO.input(sensor_pin)

    while True:
        await asyncio.sleep(3)
        curr_value = GPIO.input(sensor_pin)

        if last_value != curr_value:
            last_value = curr_value

            try:
                await client.send_message(channel, 'Squirtle squirt! (There might be a knock on the door!)')
            except:
                print('Squirtle failed to deliver the message')
                traceback.format_exc()

@client.event
async def on_ready():
    # get the first channel in the first server
    channel = None
    for server in client.servers:
        for c in server.channels:
            channel = c
            break

    try:
        client.loop.create_task(check_door(channel))
    except:
        print('Could not schedule task.')
        traceback.format_exc()

    print('Squirtle is checking the door...')

client.run(TOKEN)