GPIOZero

GIOZero is a Python module that makes it very easy to work with the Raspberry Pi GPIO pins and to get started with physical computing and electronics.

LED

Connect a LED to a GPIO pin and light, blink and pulse the LED.

PiRingo (4tronix)

LED

GPIO pin

LED 1

4

LED 2

17

LED 3

18

LED 4

27

LED 5

22

LED 6

23

LED 7

24

LED 8

25

LED 9

8

LED 10

7

LED 11

14

LED 12

15

Button

GPIO pin

Button 1

10

Button 2

9

 
from gpiozero import LEDBoard

led_circle = LEDBoard(4, 17, 18, 27, 22, 23, 24, 25, 8, 7, 14, 15)
led_circle.on()  # all LED's on
led_circle[2].on()  # third LED on (count from zero)

RGBLED

Connect a tri-colour (r,g,b) LED to the GPIO pins and create multiple colours.

##
# Colour wheel using a tri-colour LED
#

from time import sleep

from gpiozero import RGBLED

# Assign the correct pins for the three colours
led = RGBLED(green=13, blue=19, red=26)

# Function to cycle through colours
def colour_wheel(pos):
    # Input a value 0 to 255 to get a color value.
    # The colours are a transition r - g - b - back to r.
    if pos < 0 or pos > 255:
        return 0, 0, 0
    if pos < 85:
        return int(255 - pos*3)/1000, int(pos*3)/1000, 0
    if pos < 170:
        pos -= 85
        return 0, int(255 - pos*3)/1000, int(pos*3)/1000
    pos -= 170

    return int(pos * 3)/1000, 0, int(255 - (pos*3))/1000


i = 0
while True:
    # Run from 0 to 255
    i = (i + 1) % 256
    # Cycle through colours
    led.color = colour_wheel(i)
    sleep(0.01)

Traffic lights (Pi-Stop)

Connect three (red, amber, green) LED’s to act as a traffic light signal. (See LED above using three LED’s).

Button/switch

Ultrasonic distance sensor

Use an ultrasonic distance sensor to measure distance or detect objects.

Motor

A simple motor connected to the Pi through which the speed and direction can be controlled. Please note, a H bridge will be required to control the motor.

Servo motor

A servo motor connected to the Pi and controlled to rotate to various angles.