Question

Write the code using CircuitPython (in Python). Create an alarm system using the Raspberry Pi Pico (RP2-B2) with 5 push buttons used as the passcode. The intrusions aspects are NOT included for this portion.

Answer 1

To create an alarm system using the Raspberry Pi Pico, connect 5 push buttons as the passcode, write a code in CircuitPython to read button presses, and compare them to the passcode. An example code is provided.

Step-by-step explanation:

Create an Alarm System using Raspberry Pi Pico

To create an alarm system using the Raspberry Pi Pico, you will need to connect 5 push buttons to the board. Each button will represent a digit in the passcode. You can wire the buttons to different GPIO pins on the Pi Pico. Then, write a code in CircuitPython to read the button presses and compare them to the passcode.

Here's an example code:

import board
import digitalio

passcode = [1, 2, 3, 4, 5] # Replace with your desired passcode
push_buttons = [board.GP0, board.GP1, board.GP2, board.GP3, board.GP4]

buttons = []
for pin in push_buttons:
button = digitalio.DigitalInOut(pin)
button.direction = digitalio.Direction.INPUT
data = []
def button_pressed(pin):
data.append(pin)
if len(data) == len(passcode):
if data == passcode:
print('Alarm Deactivated')
else:
print('Incorrect Passcode!')
data.clear()

for pin in push_buttons:
button = digitalio.DigitalInOut(pin)
button.direction = digitalio.Direction.INPUT
button.pull = digitalio.Pull.UP
button.irq(trigger=digitalio.Trigger.RISING, handler=button_pressed)

This code sets up a passcode list and a list of GPIO pins for the push buttons. It then creates button objects for each pin and sets their direction to input. The button_pressed function is used as an interrupt handler when a button is pressed. It adds the pressed button to the data list and checks if the passcode has been fully entered. If it has, it checks if the entered passcode matches the desired passcode and prints the appropriate message. Lastly, it clears the data list to get ready for the next passcode attempt.

This code can be further expanded to include actions when the passcode is correct, such as activating a buzzer or sending a notification. Remember to connect the push buttons correctly and customize the passcode according to your needs.