LED Simulator

Build. Automate. Simulate.

LED Canvas

Time: 0s

Code Editor — loops, functions, setup/loop or plain code

Status: Idle

Console Output

Tip: load example → press Run. Use Stop to abort loops.

Number of LEDs

Max 30 LEDs. Set on load/apply.

Examples

Help & Instructions

Quick Start

Pick an example → Load
Press Run to start simulation
Press Stop to abort loops (silent, no error dialog)
Change LED count → Apply to resize canvas

Commands

digitalWrite(pin, HIGH) or digitalWrite(pin, LOW)
delay(ms) — pauses (auto-awaited)
console.log(msg) — outputs to the console below
You can use for, while, nested loops & functions
Support for void setup() and void loop() — they become async

Hints & Quick Tips

Use small delays (80–160ms) for smooth sweeps.
Put delay() inside tight loops so Stop is responsive.
Load examples to see patterns; you can edit and rerun them.
Set LED count to the number your code uses.