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The same compiler
Your sketch goes through the same compiler used for the physical board. Errors come back with the right message and the right line — and code that builds here, builds there.
ESP32 simulator · in your browser
Code it. Wire it.
Watch it run.
STANNUM is a hands-on simulator for learning embedded programming. Write Arduino code, build the circuit on screen and press run — your program is compiled and executed on an emulated ESP32, live. Nothing to buy, nothing to install, nothing to burn out.
blink.cpp
editing
serial monitor
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modules ready
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boards supported
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in the browser
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to use
01
Not a cartoon of a circuit
Many simulators just animate what your code should do. STANNUM compiles it and executes it — what you see on screen is what your program actually does.
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An emulated chip
Behind the screen, an emulated ESP32 boots, loads your program and executes it line by line. A half-second delay in your code takes half a second on the clock.
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Live interaction
Press the on-screen button and your code notices. Drive a pin high and the LED lights up. Turn the potentiometer and the reading changes — both directions, instantly.
02
From code to a working circuit
Four steps from an empty editor to a blinking LED.
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Write the code
In the editor, using the Arduino language — the same one from the thousands of tutorials out there.
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Build the circuit
Drag modules onto the canvas and wire them pin by pin. Wired it wrong? Undo and try again — nothing burns out here.
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Hit run
In a few seconds your program is compiled and running on the emulated chip.
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Watch it happen
The LED blinks, the buzzer beeps, the display draws — and the serial monitor shows everything your code prints.
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Modules & boards
Twenty-eight modules ready to drag, wire and program — each one modeled after the actual part: BME280, NEO-6M, SSD1306 and friends.
SSD1306 OLED
A 128×64 display your code draws on, pixel by pixel — text, numbers, graphics.
SG90 servo
The arm on screen follows your code's signal, degree by degree.
NEO-6M GPS
Streams position data to your code over the serial port, sentence by sentence.
Output
- LED
- RGB LED
- LED bar graph
- MAX7219 8×8 matrix
- SSD1306 OLED
- SG90 servo
- Relay module
- Lamp
- Active buzzer
Input & measuring
- Push button
- Slide switch
- 4×4 keypad
- Analog joystick
- Potentiometer
- Voltmeter
Boards
- ESP32 DevKitC 30-pin
- ESP32 DevKitC V4 38-pin
- ESP32-WROOM-32 module
Starting with the ESP32 family — built to grow.
Sensors
- HC-SR501 PIR
- LDR photoresistor
- LM35
- NTC 10k thermistor
- Reed switch
- HC-SR04 ultrasonic
- MQ-2 gas & smoke
- YL-69 soil moisture
- FC-37 rain sensor
- NEO-6M GPS
- BME280
- MPU6050
- HMC5883L compass
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Made for getting started
Intuitive
Open it, get it: code on one side, circuit on the other, one button to run. No manual needed.
Zero cost
Boards, sensors, wires, breadboards — they cost money, and they burn out. Learn the same things without spending a cent.
Skills that transfer
The goal is simple: leave knowing how to program an ESP32. When you get a physical board, your code goes with you.