Writing our Python program

To start with, we will write a simple, short piece of Python just to check that all ten of our LEDs are working, and we know which GPIO pin controls which pair of LEDs. Power on your Pi Zero and connect to it via SSH.

Testing our LEDs

To check that our LEDs are all correctly wired up and that we can control them using Python, we will write this short program to test them.

First, move into our project directory by typing this:

      cd ~/WearableTech/

Now, make a new directory for this chapter by typing this:

mkdir Chapter3

Now, move into our new directory:

cd Chapter3

Next, we create our test program by typing this:

nano testLED.py

Then, we enter the following code into Nano:

#!/usr/bin/python3

from gpiozero import LED
from time import sleep

pair1 = LED(11)
pair2 = LED(9)
pair3 = LED(10)
pair4 = LED(7)
pair5 = LED(8)

for i in range(4):
    pair1.on()
    sleep(2)
    pair1.off()
    pair2.on()
    sleep(2)
    pair2.off()
    pair3.on()
    sleep(2)
    pair3.off()
  ...