Example project · Displays
Ring with a power switch
The toggle switch gates the NeoPixel ring's 5 V pin while the ESP32-C3 keeps streaming rainbow frames: flick it off and the ring goes dark instantly; flick it on and the next frame repaints.
What's on the bench
- Battery
- ESP32-C3
- NeoPixel ring ×12
- Toggle switch
How it's wired
- hole a10→hole B-5
- hole a11→hole B+5
- hole B+9→hole a30
- hole c32→hole a40
- hole a42→hole B-9
- hole a14→hole c41
The code
This MicroPython script runs on the emulated board every boot; edit it in the Code tab.
# Rainbow chase on the ring. The toggle switch gates the ring's 5 V pin: # flick it off and the pixels go dark instantly; flick it back on and the # next frame repaints them. The C3 keeps streaming frames throughout. import machine, neopixel, time RAINBOW = [ (255, 0, 0), (255, 96, 0), (255, 200, 0), (96, 255, 0), (0, 255, 60), (0, 255, 200), (0, 160, 255), (0, 40, 255), (90, 0, 255), (200, 0, 255), (255, 0, 160), (255, 0, 60), ] np = neopixel.NeoPixel(machine.Pin(2), 12) for step in range(4000): for i in range(12): np[i] = RAINBOW[(i + step) % 12] np.write() time.sleep_ms(120) print('ring demo done')
