Arduino project · LEDs and lights · Beginner
NeoPixel Ring Fill-Up Animation
The colour pixels on a ring light up one by one until the whole ring is lit, then it clears.
What you will learn
- How one data wire controls many RGB LEDs
- How a colour wheel (hue) gives a different colour to each pixel
- Why NeoPixels need a capacitor and a resistor
How it works
The Arduino sends colour data down one wire. Each pixel keeps its own colour and passes the rest on. The program lights the first N pixels with N going from 0 up to 8, and every pixel gets its own colour from the colour wheel.
Try this next
- Run the animation faster.
- Change the brightness in setup().
- Light the ring backwards.
The simulator program and explanation on this page are original. The idea follows a classic Arduino project that students have built for years.
Parts: sensors and actuators (tap to show or hide)
Try the inputs (virtual sensors)
Pins (you can change them)
| Part | Arduino pin (change it here) | How to wire it |
|---|
Every wire, one by one
Red rail = 5 V from the Arduino 5V pin. Black rail = GND. The coloured wires carry signals. Match the wire colours on the drawing to this list.
| # | Colour | From (part and leg) | To |
|---|
Steps run from top to bottom, then start again. While the simulation runs, the active step is highlighted in green.
Quantities come from the parts you added. The store links open a search for that item on Robu.in, Amazon.in and ThinkRobotics, so you always see what is in stock today. Check the model, voltage and price before you order.
| # | Item | Qty | Search term | Buy / compare |
|---|
The PDF has the circuit sketch, pin table, every wire, sequence, full code, the parts list with store links, do’s and don’ts for each part, and the safety notes. The project file lets you come back and keep editing.
In the real world
A glowing ring of lights
The ring lights as many pixels as your program asks for, from green to red.
Tip: use the gold tab at the bottom of the circuit drawing to pull the real-world view up over the Arduino board. Your parts stay visible above it, so you can press a button and watch the real scene react.
- NeoPixel ring = the glowing ring