40pin IO Development

Experiment 01 - GPIO Output (LED Blinking)

Hardware Connection

Connect the LED bulb to VCC, GND, and IO37 on the RDK-X5 mainboard.

Software Operation

Enter the user home directory and run:

cd user
sudo python3 ./LED_out.py

Terminal as shown:

At this point, the LED bulb starts blinking at one-second intervals.

#!/usr/bin/env python3
import sys
import signal
import Hobot.GPIO as GPIO
import time

def signal_handler(signal, frame):
    sys.exit(0)

# Define GPIO channel 37
output_pin = 37 # BOARD pin 37

def main():
    # Set pin numbering mode to BOARD
    GPIO.setmode(GPIO.BOARD)
    # Set as output and initialize to high level
    GPIO.setup(output_pin, GPIO.OUT, initial=GPIO.HIGH)
    # Record current pin state
    curr_value = GPIO.HIGH
    print("Starting demo now! Press CTRL+C to exit")
    try:
        # Toggle LED every 1 second
        while True:
            time.sleep(1)
            GPIO.output(output_pin, curr_value)
            curr_value ^= GPIO.HIGH
    finally:
        GPIO.cleanup()

if __name__=='__main__':
    signal.signal(signal.SIGINT, signal_handler)
    main()