LED & Button Control

The blade has two digital LEDs mounted in series. A square yellow LED is located on the top of the board, and a green LED is located on the edge. The LEDs can be controlled via GPIO18.

info

You'll need to install the Adafruit_Blinka and the NeoPixel library.

Python

from time import sleep
import board
import neopixel
import RPi.GPIO as GPIO

# LED strip configuration:
LED_COUNT = 2         # Number of LED pixels.
LED_PIN = board.D18   # GPIO pin connected to the pixels.
LED_BRIGHTNESS = 1    # Brightness of the LED pixels

# Button configuration:
BUTTON_PIN = 20       # GPIO pin connected to the button.

# Setup the button pin
GPIO.setmode(GPIO.BCM)
GPIO.setup(BUTTON_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)

# Create NeoPixel object with appropriate configuration.
pixels = neopixel.NeoPixel(LED_PIN, LED_COUNT, brightness=LED_BRIGHTNESS, auto_write=False)

# Generate a random color.
def random_color():
    return (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))

# Set the color of the entire strip.
def set_color(color):
    for i in range(LED_COUNT):
        pixels[i] = color
    pixels.show()

print('Press the button to change colors. Press Ctrl-C to quit.')

try:
    while True:
        button_state = GPIO.input(BUTTON_PIN)
        if button_state == GPIO.LOW:
            # Button is pressed
            color = random_color()
            set_color(color)
            # Wait for the button to be released
            while GPIO.input(BUTTON_PIN) == GPIO.LOW:
                sleep(0.01)
        sleep(0.1)
except KeyboardInterrupt:
    # Cleanup on exit
    GPIO.cleanup()

Edge Button

The button is connected to GPIO20 in the Raspberry PI compute module and can be customized as you like. Can be pressed with a left touch of the Blade latch.

Example Script

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(20, GPIO.IN, pull_up_down=GPIO.PUD_UP) #Button to GPIO20

try:
    while True:
         button_state = GPIO.input(20)
         if button_state == False:
             print('Button Pressed...')
             time.sleep(0.2)
except:
    GPIO.cleanup()

Edge Button

Example Script​

Example Script