Whoo-Pi Cushion with Raspberry Pi

Create a pressure-sensitive switch using plates and foil.

1. Cut two cardboard circles to fit inside the deep part of the paper plates.
2. Attach aluminum foil strips to each cardboard circle using sticky tape. Make the strips long enough to reach the plate's lip.
3. Use copper tape to fasten the foil strips to the edge of each plate to maintain conductivity.
4. Cut sponge into cubes and glue them around the foil on one plate to keep the foil strips separated.
5. Position the two plates so the foil strips face each other but don't touch.
6. Tape the plates together or use paper clips to hold them.

Wire the cushion as a button input.

1. Plug one jumper cable into a GND pin on your Raspberry Pi.
2. Plug the other jumper cable into GPIO pin 2.
3. Use crocodile clip cables to connect the copper tape strips to the male pins of the jumpers.
4. Connect one copper strip to GND and the other to GPIO 2.

Find and prepare sound files for playback.

1. Create a folder called 'whoopi' in your home directory.
2. Download funny sound effects in .wav format (search online or record your own).
3. Save at least 3 sound files in the 'whoopi' folder.
4. Test playback using the aplay command in Terminal.
5. Configure audio output to the headphone jack.

$ amixer cset numid=3 1

Create a script that plays a random sound when the cushion is pressed.

1. Open Python 3 (IDLE) and create a new file.
2. Save it as 'whoopi.py' in the whoopi folder.
3. Import the necessary libraries (os, random, time, gpiozero).
4. Create a list of your sound file names.
5. Write a loop that waits for button presses and plays a random sound.

import os
import random
from time import sleep
from gpiozero import Button

button = Button(2)

sounds = ['fart1.wav', 'fart2.wav', 'fart3.wav']

while True:
    button.wait_for_press()
    sound = random.choice(sounds)
    os.system("aplay {0}".format(sound))
    sleep(2)

Verify the cushion triggers sounds when pressed.

1. Run your Python script.
2. Place the cushion on a chair (hide the wires if possible).
3. Sit on the cushion and listen for a random sound to play.
4. If nothing happens, check the wiring and ensure the foil strips make contact when pressed.