Arduino, running the sketch you wrote
arduino-cli compiles it, an AVR8 core executes it instruction by instruction, and the LCD shows what the ATmega328P actually put on the bus. Uno, Nano, Mega and ATtiny85, no board on your desk.

Hardware is all about iteration. Velxio lets you wire a circuit, program the board and run it in seconds, real firmware on a real solver, right in the browser.
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Nothing on this page is a scripted animation: the firmware is compiled and executed, and the circuit around it is solved.
arduino-cli compiles it, an AVR8 core executes it instruction by instruction, and the LCD shows what the ATmega328P actually put on the bus. Uno, Nano, Mega and ATtiny85, no board on your desk.

arduino-cli or ESP-IDF compiles the sketch, then AVR8, RP2040, RISC-V, Xtensa or ARM executes it instruction by instruction. What the OLED draws and what the serial monitor prints is what the chip actually did.

ngspice compiled to WebAssembly runs a full nodal analysis about 60 times a second. GPIO pins drive real nets, ADC inputs read solved node voltages, and probes report RMS, DC and current wherever you drop them.

Adders, comparators, decoders, flip-flops and a 1-bit ALU slice: no microcontroller anywhere, just gates, switches and LEDs solved as a real net. The classroom half of electronics, without the breadboard.

The M5Stack Cardputer with its keyboard, Seeed's round display keeping time, Pimoroni's Badger 2350 driving e-paper, and DFRobot's UNIHIKER M10 in the catalogue alongside them. Their makers sent the hardware so the emulation could be checked against the real thing.




35 boards across 6 CPU architectures — AVR8, ARM Cortex-M, ARM Cortex-A, RISC-V, Xtensa, and Linux. Including partner boards from Pimoroni, M5Stack, Seeed Studio and DFRobot. All running locally, no cloud needed.
One institution contract gives every student in the class a full Pro account. No per-seat checkout, no card details in a classroom.
Private projects, BOM and schematic exports, GitHub Sync and the offline desktop app, for everyone enrolled.
Billed once to your institution, per semester or per year. Volume pricing on request for large cohorts.
Arduino, ESP32, RP2040, STM32, ATtiny and Raspberry Pi, with SPICE analog solved alongside the firmware. Not a sandboxed mock.
The simulator stays free forever. Paid plans raise the daily AI quota and unlock the Linux boards, private projects and the offline desktop app.
Discover the simulator + light AI help.
For makers shipping real circuits with AI help.
Private projects, GitHub Sync and BOM exports.
Questions, bugs and ideas: the Discord and the issue tracker are open, and so is every line of the simulator.
An interactive ESP32 circuit simulation you can run free in your browser on Velxio, by dacerquinll.
// Definición de pines para el controlador L293D
const int enable1Pin = 25; // EN1 (Enable del Motor A)
const int in1Pin = 26; // IN1 (Dirección 1)
const int in2Pin = 27; // IN2 (Dirección 2)
// Definición de pin para el sensor infrarrojo Grove IR
const int irSensorPin = 34; // Pin de entrada digital (GPIO 34)
// Definición de pines para LEDs indicadores
const int ledVerde = 18; // Faja en marcha
const int ledRojo = 19; // Faja detenida
void setup() {
// Configurar pines del motor como salidas
pinMode(enable1Pin, OUTPUT);
pinMode(in1Pin, OUTPUT);
pinMode(in2Pin, OUTPUT);
// Configurar pines de LEDs como salidas
pinMode(ledVerde, OUTPUT);
pinMode(ledRojo, OUTPUT);
// Configurar pin del sensor como entrada
pinMode(irSensorPin, INPUT);
// Habilitar el canal del driver L293D
digitalWrite(enable1Pin, HIGH);
// Iniciar comunicación serial para depurar
Serial.begin(115200);
}
void loop() {
// Leer el estado del sensor (LOW cuando hay objeto, HIGH cuando no hay)
int sensorState = digitalRead(irSensorPin);
if (sensorState == LOW) {
// Objeto detectado: Detener la faja
digitalWrite(in1Pin, LOW);
digitalWrite(in2Pin, LOW);
// Indicadores: LED Rojo Encendido, Verde Apagado
digitalWrite(ledRojo, HIGH);
digitalWrite(ledVerde, LOW);
Serial.println("Faja DETENIDA");
} else {
// Vía libre: Avanzar la faja transportadora
digitalWrite(in1Pin, HIGH);
digitalWrite(in2Pin, LOW);
// Indicadores: LED Verde Encendido, Rojo Apagado
digitalWrite(ledVerde, HIGH);
digitalWrite(ledRojo, LOW);
Serial.println("Faja EN MARCHA");
}
delay(100); // Pequeña pausa para estabilizar lecturas
}