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.
DFRobot · M5Stack links on this page are affiliate links: a purchase through them earns Velxio a small commission at no extra cost to you.
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 abdullahkevin213.
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
// =====================================================
// DEFINISI PIN
// =====================================================
// Flame Sensor (Analog Out -> GPIO 34)
#define FLAME_PIN 34
// DHT22 (Data -> GPIO 4)
#define DHT_PIN 4
#define DHT_TYPE DHT22
// LCD I2C (SDA -> GPIO 21, SCL -> GPIO 22)
#define SDA_PIN 21
#define SCL_PIN 22
// RGB LED
#define RGB_RED 26
#define RGB_GREEN 25
#define RGB_BLUE 33
// Grove Passive Buzzer (SIG -> GPIO 2)
#define GROVE_BUZZER_PIN 2
// =====================================================
// KONFIGURASI PWM LEDC (ESP32 CORE v3)
// =====================================================
#define BUZZER_FREQ 1500 // Frekuensi nada (Hz)
#define BUZZER_RESOLUTION 8 // Resolusi 8-bit (0-255)
// =====================================================
// DEKLARASI OBJEK
// =====================================================
DHT dht(DHT_PIN, DHT_TYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
// =====================================================
// BATAS KONDISI (THRESHOLDS)
// =====================================================
#define TEMP_SIAGA 40.0
#define TEMP_BAHAYA 50.0
#define FLAME_PCT_SIAGA 20 // Intensitas Api > 20%
#define FLAME_PCT_BAHAYA 30 // Intensitas Api > 30%
// =====================================================
// SETUP
// =====================================================
void setup() {
Serial.begin(115200);
// Set Pin Mode untuk Sensor & Indikator
pinMode(FLAME_PIN, INPUT);
pinMode(RGB_RED, OUTPUT);
pinMode(RGB_GREEN, OUTPUT);
pinMode(RGB_BLUE, OUTPUT);
// Inisialisasi LEDC (Arduino ESP32 v3.x API)
// Pin, Frekuensi, Resolusi digabung dalam 1 fungsi
ledcAttach(GROVE_BUZZER_PIN, BUZZER_FREQ, BUZZER_RESOLUTION);
// Matikan indikator pada saat startup
rgbOff();
buzzerOff();
// Inisialisasi Sensor DHT22
dht.begin();
// Inisialisasi LCD I2C
Wire.begin(SDA_PIN, SCL_PIN);
lcd.init();
lcd.backlight();
// Layar Sambutan
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Fire Detector");
lcd.setCursor(0, 1);
lcd.print("System Starting");
delay(2000);
lcd.clear();
Serial.println("=================================");
Serial.println(" FIRE DETECTION SYSTEM READY ");
Serial.println("=================================");
}
// =====================================================
// KONTROL RGB LED
// =====================================================
void rgbOff() {
digitalWrite(RGB_RED, LOW);
digitalWrite(RGB_GREEN, LOW);
digitalWrite(RGB_BLUE, LOW);
}
void rgbAman() {
rgbOff();
digitalWrite(RGB_GREEN, HIGH);
}
void rgbSiaga() {
rgbOff();
digitalWrite(RGB_BLUE, HIGH);
}
void rgbBahaya() {
rgbOff();
digitalWrite(RGB_RED, HIGH);
}
// =====================================================
// KONTROL GROVE PASSIVE BUZZER (API ESP32 v3.x)
// =====================================================
void buzzerOn() {
// Menghas