cell_loader_ctrl/playgrounds/gpio_playground.py

import asyncio
import pigpio

async def toggle_pin(pin: int):
    """Toggle a GPIO pin indefinitely."""
    pi = pigpio.pi()
    if not pi.connected:
        raise RuntimeError(f"Failed to connect to pigpio daemon for pin {pin}")
    
    state = 0
    try:
        while True:
            state = 1 - state  # Toggle state between 0 and 1
            pi.write(pin, state)
            await asyncio.sleep(1)  # Wait 1 second between toggles
    finally:
        pi.write(pin, 0)  # Ensure the pin is turned off
        pi.stop()

async def main():
    """Run multiple toggle_pin tasks in parallel."""
    pins = [17, 27, 22]  # Replace with the GPIO pins you want to toggle
    tasks = [toggle_pin(pin) for pin in pins]
    await asyncio.gather(*tasks)

if __name__ == "__main__":
    try:
        asyncio.run(main())
    except KeyboardInterrupt:
        print("Exiting...")