The program for this project just loops round printing a message every time motion is detected, or the magnet is moved away from the door.
We are using the CircuitPython Libraries that are part of adafruit-blinka. See CircuitPython Libraries on Raspberry Pi to get a fresh Raspberry Pi setup.
If you have a running Raspberry Pi with an up to date copy of Raspbian you can simply run the following command to install adafruit-blinka.
$ sudo pip3 install adafruit-blinka
# SPDX-FileCopyrightText: 2019 Mikey Sklar for Adafruit Industries
#
# SPDX-License-Identifier: MIT
import time
import board
import digitalio
# set up motion sensor
pir_sensor = digitalio.DigitalInOut(board.D18)
pir_sensor.direction = digitalio.Direction.INPUT
# set up door sensor
door_sensor = digitalio.DigitalInOut(board.D23)
door_sensor.direction = digitalio.Direction.INPUT
door_sensor.pull = digitalio.Pull.UP
while True:
if pir_sensor.value:
print("PIR ALARM!")
if door_sensor.value:
print("DOOR ALARM!")
time.sleep(0.5)
The program sets the pir_sensor and door_sensor to be plain old inputs.
The loop then reads each of the inputs in turn and prints a message appropriately. Remember that the door switch warning will be activated when the magnet is removed from the sensor rather than the other way around.
