Simulator

Playground

Pick an example sketch. The server builds it with arduino-cli and the ATmega328P in your browser (avr8js) runs the real .hex, with virtual sensors attached so real values flow.

FreeNo loginRuns in browser

uno_parking_sensor.ino

Parking sensor

Read only

An ultrasonic range finder beeps at shorter intervals as something gets closer, and lights an LED inside 30 cm.

Try thisDrop the 30 to 10 and it only sounds when something is very close.

What the parser saw

extracted from #include · #define · pinMode

L0 simulator

avr8js · ATmega328P

Pin states

dark border = declared in the sketch · copper = HIGH · dashed = pull-up input

Serial monitor (9600 bps)

Virtual sensor defaults: DS18B20 25.1 °C · DHT22 24.5 °C/55 % · HC-SR04 42 cm · BME280 25.08 °C/1006.5 hPa · potentiometer 2.5 V — change them with the sliders above. What you see is what the simulator observed; this page passes no verification gate.

The same sketch, as far as verification

Leave the code as it is. Take it into a project and the server checks the sketch against the simulation, then reports the circuits it is missing and why each one is needed.

Logic — the server replays the simulation you just watched and checks it against the sketch
Electrical — catalogue grounding, golden patterns, ERC, the pin contract. Every circuit we add says why
Board files — KiCad, Gerber, BOM. Not open yet

Start a project from this sketch Example details