Andrea Torlai
Created July 24, 2024

Astrial - Making an RGB led blink with Waveshare boards

The goal of this tutorial is to acquire familiarity with the Astrial platform by making an RGB led blink with 3 Waveshare carrier boards.

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Astrial - Making an RGB led blink with Waveshare boards

Things used in this project

Hardware components

Resistor 220 ohm
Resistor 220 ohm
×3
Breadboard (generic)
Breadboard (generic)
×1
RGB Diffused Common Cathode
RGB Diffused Common Cathode
×1
Male/Female Jumper Wires
Male/Female Jumper Wires
×4
Waveshare CM4-IO-BASE-A Board
×1
Waveshare CM4-IO-BASE-B Board
×1
Waveshare CM4 PoE Board (B)
×1
Astrial
×1
PoE injector
(Optional)
×1

Story

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Schematics

Waveshare CM4-IO-BASE-A/B Board

Waveshare CM4 PoE Board

Code

rgb_led_blink.py

Python
import time
from gpiod.line import Direction, Value
import gpiod

# Define the GPIO lines for the RGB LED
RED_LINE = 3
GREEN_LINE = 2
BLUE_LINE = 1

# Define the GPIO device
GPIO_DEVICE = "/dev/gpiochip1"

# Ensure the GPIO device is valid
assert gpiod.is_gpiochip_device(GPIO_DEVICE)

# Request control over the GPIO lines with initial settings
with gpiod.request_lines(
    GPIO_DEVICE,
    consumer="blink-example",
    config={
        # Configure the red LED line as output and initially inactive
        RED_LINE: gpiod.LineSettings(
            direction=Direction.OUTPUT, output_value=Value.INACTIVE
        ),
        # Configure the green LED line as output and initially inactive
        GREEN_LINE: gpiod.LineSettings(
            direction=Direction.OUTPUT, output_value=Value.INACTIVE
        ),
        # Configure the blue LED line as output and initially inactive
        BLUE_LINE: gpiod.LineSettings(
            direction=Direction.OUTPUT, output_value=Value.INACTIVE
        ),
    },
) as request:
    # Loop indefinitely to blink the RGB LED
    while True:
        # Activate the red LED
        request.set_value(RED_LINE, Value.ACTIVE)
        time.sleep(0.5)  # Wait for 0.5 seconds
        # Deactivate the red LED
        request.set_value(RED_LINE, Value.INACTIVE)

        # Activate the green LED
        request.set_value(GREEN_LINE, Value.ACTIVE)
        time.sleep(0.5)  # Wait for 0.5 seconds
        # Deactivate the green LED
        request.set_value(GREEN_LINE, Value.INACTIVE)

        # Activate the blue LED
        request.set_value(BLUE_LINE, Value.ACTIVE)
        time.sleep(0.5)  # Wait for 0.5 seconds
        # Deactivate the blue LED
        request.set_value(BLUE_LINE, Value.INACTIVE)

GitHub

Credits

Andrea Torlai

Andrea Torlai

10 projects • 3 followers

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