WS2812 strip: rainbow

Goal

Animate a gradient scrolling along the addressable strip.

Why it matters

Each LED has its own controller: a single data wire drives hundreds of pixels.

Steps

1. 01Add the NeoPixel strip on pin 6.
2. 02Write a wheel(pos) function returning a colour.
3. 03Shift the offset on every loop pass.
4. 04Watch the current: 60 mA per LED at full power.

Next tutorials

• PWM: dimming an LED

  Breathe an LED from 0 to 255 with analogWrite().

• Potentiometer → brightness

  Set LED brightness with the knob (10 bits to 8 bits).

• RGB LED: mixing colours

  Create any colour with three PWM channels.

• Smooth fade (sine curve)

  Make the fade look linear by using a non-linear curve.