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.
An interactive ESP32 circuit simulation you can run free in your browser on Velxio, by ryanankar.
/*************************************************************
Latihan Blynk IoT dengan ESP32:
- Potensiometer -> Pin D34 (Virtual Pin V6)
- LED Merah -> Pin D18 (Virtual Pin V7)
*************************************************************/
/* Fill-in information from Blynk Device Info here */
#define BLYNK_TEMPLATE_ID "TMPL6VY-TOzBZ"
#define BLYNK_TEMPLATE_NAME "Quickstart Device"
#define BLYNK_AUTH_TOKEN "0NIE1QAp2ZKNjfbqnvRLnpUDAhZJU7z7"
/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
// Your WiFi credentials.
// Ganti dengan Nama WiFi dan Password Anda.
char ssid[] = "ARFANAKBAR";
char pass[] = "Aespa1705-";
BlynkTimer timer;
// Definisi Pin Sesuai Rangkaian
const int POT_PIN = 34; // Pin SIG Potensiometer ke D34
const int LED_PIN = 18; // Anoda LED ke D18
// Fungsi untuk mengontrol LED dari Blynk App (Virtual Pin V7)
BLYNK_WRITE(V7)
{
int ledState = param.asInt(); // Membaca nilai tombol (0 atau 1)
digitalWrite(LED_PIN, ledState); // Mengubah status LED fisik
}
// Fungsi ini dipanggil secara berkala oleh timer (setiap 1 detik)
void myTimerEvent()
{
// 1. Baca nilai analog dari potensiometer (0 hingga 4095 pada ESP32)
int potValue = analogRead(POT_PIN);
// 2. Kirim nilai potensiometer ke Blynk Cloud pada Virtual Pin V6
Blynk.virtualWrite(V6, potValue);
// 3. Kirim uptime ESP32 ke Virtual Pin V2 (opsional dari template bawaan)
Blynk.virtualWrite(V2, millis() / 1000);
}
void setup() {
Serial.begin(115200);
delay(1000);
// Mulai koneksi WiFi secara manual untuk melihat pesan error-nya
WiFi.begin(ssid, pass);
Serial.print("Menghubungkan ke WiFi");
int counter = 0;
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
counter++;
if (counter > 40) { // Jika lebih dari 20 detik tidak tersambung
Serial.println("\nGagal terhubung! Periksa kembali SSID/Password atau sinyal 2.4GHz.");
break;
}
}
if (WiFi.status() == WL_CONNECTED) {
Serial.println("\nWiFi Berhasil Terhubung!");
Serial.print("IP Address: ");
Serial.println(WiFi.localIP());
}
// Setelah itu baru jalankan Blynk
Blynk.config(BLYNK_AUTH_TOKEN);
Blynk.connect();
pinMode(LED_PIN, OUTPUT);
pinMode(POT_PIN, INPUT);
timer.setInterval(1000L, myTimerEvent);
}
void loop()
{
Blynk.run();
timer.run();
}