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Jimmy e3400120d3 Seed bundled demos under top-level demos/ instead of code/

Move canonical sample scripts to a sibling folder of code/ and lib/ so
user projects stay separate from shipped examples. Backend seeding,
writable paths, and docs follow the new layout.

Co-authored-by: Cursor <cursoragent@cursor.com>

2026-06-14 22:34:12 +12:00

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Python LED Tutorial (NeoPixel Focus)

This tutorial is for the browser editor's ESP32-style mocks:

machine.Pin
neopixel.NeoPixel

Open demos/led_tutorial.py in the editor while reading this guide. (Source of truth: src/static/bundled-demos/demo/led_tutorial.py — the top-level demos/ folder is seeded from there on first run.)

1) Basic setup

from machine import Pin
import neopixel

np = neopixel.NeoPixel(Pin(4), 12)

Pin(4) means data pin 4 (matching common ESP32 examples).
12 is the number of LEDs in the strip/ring.
np is your LED strip object.

2) Set one LED color

np[0] = (255, 0, 0)  # red
np.write()

Colors are (red, green, blue) from 0 to 255.
Nothing updates visually until np.write().

3) Fill all LEDs

np.fill((0, 0, 255))  # all blue
np.write()

4) Clear LEDs (turn off)

np.fill((0, 0, 0))
np.write()

5) Animate over time

import time

for step in range(20):
    np.fill((step * 10, 0, 255 - step * 10))
    np.write()
    time.sleep(0.08)

time.sleep(...) controls animation speed.

6) Moving pixel example

for i in range(len(np)):
    np.fill((0, 0, 0))
    np[i] = (255, 120, 0)
    np.write()
    time.sleep(0.06)

7) Tips

Keep color values in 0..255.
Use helper functions for repeated color logic.
Start with short loops, then increase frames once behavior looks good.
If the simulator is closed, run your script again to show updates.

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