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 unlock the Linux and STM32 boards, WiFi and the offline desktop app. Maker and Pro add the AI agent; No AI leaves it out.
Discover the simulator + light AI help.
The full workbench, zero AI. You write every line.
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.
TESTE
An interactive ESP32 circuit simulation you can run free in your browser on Velxio, by oagengenharias.
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <HTTPClient.h>
#include <Wire.h>
#include <DHT.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
// =====================================================
// CONCRETRACK - CURA DO CONCRETO
// ESP32 + 4 DHT22 + OLED
// DEVICE: cura-01
// VERSAO: cura-velxio-2.1
// =====================================================
// =====================================================
// WIFI
// =====================================================
const char* WIFI_SSID = "Velxio-GUEST";
const char* WIFI_PASSWORD = "";
// =====================================================
// CONCRETRACK
// =====================================================
const char* DEVICE_ID = "cura-01";
const char* CONFIG_URL =
"http://concrefer.concretrack.com.br:18445/api/v1/device-config/cura-01";
const char* INGEST_URL =
"http://concrefer.concretrack.com.br:18445/api/v1/ingest";
// IMPORTANTE:
// COLOQUE AQUI A DEVICE API KEY QUE JA FUNCIONOU
const char* DEVICE_API_KEY =
"ee9c4a6fd72559bd7f43b4341dd0cf2e3e1b8f13fd8f60f474fc7ce3b3f4d996";
// =====================================================
// DHT22
// =====================================================
#define DHTTYPE DHT22
#define PIN_T1 13
#define PIN_T2 14
#define PIN_T3 27
#define PIN_T4 26
DHT sensorT1(PIN_T1, DHTTYPE);
DHT sensorT2(PIN_T2, DHTTYPE);
DHT sensorT3(PIN_T3, DHTTYPE);
DHT sensorT4(PIN_T4, DHTTYPE);
// =====================================================
// OLED
// =====================================================
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(
SCREEN_WIDTH,
SCREEN_HEIGHT,
&Wire,
-1
);
// =====================================================
// VARIAVEIS
// =====================================================
float temp1 = 0.0;
float temp2 = 0.0;
float temp3 = 0.0;
float temp4 = 0.0;
float temperaturaMaxima = -100.0;
bool sensoresOK = false;
bool relogioSincronizado = false;
bool telaTemperaturas = true;
unsigned long inicioSistema = 0;
unsigned long ultimaLeitura = 0;
unsigned long ultimoEnvio = 0;
unsigned long ultimoConfig = 0;
unsigned long ultimaTrocaTela = 0;
unsigned long ultimaTentativaWiFi = 0;
int intervaloMinutos = 1;
int configRevision = 1;
uint32_t seqAtual = 1;
uint64_t serverTimeBase = 0;
unsigned long millisBase = 0;
String bootId;
// =====================================================
// GERAR BOOT ID
// =====================================================
String gerarBootId() {
uint64_t chipid = ESP.getEfuseMac();
char buffer[24];
unsigned long parteAlta =
(unsigned long)(chipid >> 32);
unsigned long parteBaixa =
(unsigned long)(chipid & 0xFFFFFFFFULL);
snprintf(
buffer,
sizeof(buffer),
"%08lX%08lX",
parteAlta,
parteBaixa
);
return String(buffer);
}
// =====================================================
// RELOGIO DO SERVIDOR
// =====================================================