The Official Raspberry Pi Projects Book - Projects_Book_v4

Tutorial

raspberrypi.org/magpi The Official Raspberry Pi Projects Book 105

3V3GP2

GP3GP4

GP17GND

GP27GP22

GP103V3

GP09GP11

GNDDNC

GP5GP6

GP13GP19

GP26GND

5V5V

GP14GND

GP15GP18

GP23GND

GP24GND

GP25GP8

GP7DNC

GP12GND

GP16GND

GP20GP21

MAKE A WHOOPI CUSHION

import os

import random

from time import sleep

from gpiozero import Button

button = Button( 2 )

trumps = ['ben-fart.wav', 'ca-fart.wav', 'marc-fart.wav']

while True:

button.wait_for_press()

parp = random.choice(trumps)

os.system("aplay {0} ".format(parp))

sleep( 2 )

whoopee.py

Language

>PYTHON 3

DOWNLOAD:

magpi.cc/

WhoopiCushion

True:. Then, add button.wait_for_press() inside
the loop by indenting by four spaces. Each time
around the loop, the computer waits for the button
to be pressed.
On the next line, use the random.choice function
to select a sound at random from the list you created
earlier. That selected sound needs to be stored inside
another variable which you can call parp! Type parp =
random.choice(trumps).
The next line will play the sound selected at random
using aplay, as used earlier when testing sounds.
Type os.system("aplay {0}".format(parp)).
Finally, add sleep(2) to pause the program before it
starts the loop again. Your code should look like this:

while True:

button.wait_for_press()

parp = random.choice(trumps)

os.system("aplay {0}".format(parp))

sleep(2)

Save the file by clicking on File > Save. Test that your
code works by clicking on Run > Run Module. Use your
hand to push the top plate of your Whoopi cushion
down to make a connection between the foil sheets,
and you should hear a fun sound. If it doesn’t work first
time, don’t worry. Check your code through. Have you
typed your code out exactly as you see it here?

Setting it up

Carefully place your cushion in a spot where your

victim will sit on it (obviously!), but not under a really

heavy cushion where it will be squashed straight

away. The tricky bit is setting up the Pi so that it

can’t be seen: remember, you’ll need a plug socket to

connect it to the power, unless you’re using a battery

pack. Run the program, and wait. Here’s a hint:

whistle tunelessly and look around at the ceiling. This

will make you seem innocent, and will help to attract

potential victims.

Figure 5 Yours may

be considerably

tidier than this. Or

messier. It’s all good