ESP32-C3 SuperMini Simulator
The postage-stamp RISC-V board, free in your browser
Simulate the ESP32-C3 SuperMini online for free: the tiny RISC-V ESP32-C3 running Arduino C++, MicroPython or ESP-IDF on an in-browser emulator, with its 16 pins wired to a SPICE-solved circuit.
Free plan · No install, no account · Runs in your browser
ESP32-C3 SuperMini at a glance
The SuperMini is the postage-stamp C3 board that turns up in every parts-bin project: the same single-core RISC-V ESP32-C3 as the DevKit, sixteen pins, and almost no board around the chip. Its inputs are driven by the analog engine like the rest of the catalog, so a switch or divider wired to a GPIO reads the voltage the circuit actually produces rather than an idealised level.
- Processor
- ESP32-C3, single RISC-V core at 160 MHz
- Memory
- 400 KB SRAM · 4 MB flash
- Emulation
- esp32c3js (in-browser)
- Languages
- Arduino C++ · MicroPython · ESP-IDF
- Made by
- AITEWIN Robot
- Plan
- Free
What you can do with the ESP32-C3 SuperMini simulator
The board on the canvas is the real thing as far as your code is concerned: the same pins, the same buses, the same peripherals, wired to the same 100+ sensors, displays and actuators every other Velxio board talks to.
Arduino C++ sketches
Write a sketch in the Monaco editor with library completion, compile it against the board's own Arduino core and run the real firmware binary. The Serial Monitor is the USB port.
MicroPython
Switch the board to MicroPython from the toolbar and run main.py against the same circuit. Drivers are plain .py files in the workspace, copied onto the board's filesystem before your script starts.
ESP-IDF projects
Build a full ESP-IDF project (v5.5.4) with FreeRTOS tasks, sdkconfig and components, and run it on the emulated chip without a devkit on your desk.
WiFi against a virtual access point
The emulator advertises the Velxio-GUEST network: HTTP servers, MQTT clients and NTP sync in your sketch connect and answer, without leaving the browser.
GPIO, PWM and ADC
Drive LEDs, relays and servos, read buttons and potentiometers, dim with PWM. Every pin follows the board's real pin map, so what works here works on the hardware.
I2C, SPI and UART
Talk to OLEDs, IMUs, ADCs, RTCs and SD cards over the buses the board really has. Bus traffic runs through emulated peripherals, not through a shortcut.
Serial Monitor
USB CDC serial reaches the Serial Monitor at the sketch's baud rate, with input, timestamps and a plotter.
SPICE analog parts
Op-amps, transistors, regulators and passives simulate in real time with ngspice in the browser; the board's pins drive them and read the solved voltages back.
ESP32-C3 SuperMini examples
This board has no examples of its own yet. These are written for the ESP32-C3 DevKit devkit, which uses the same chip: they run on the ESP32-C3 SuperMini after a pin map check.
ESP32-C3: Blink LEDBlink an LED on GPIO 8 of the ESP32-C3. Runs through the QEMU lcgamboa backend (libqemu-riscv32) at 160 MHz.
ESP32-C3: Serial HelloPrint Hello World and a heartbeat every second from ESP32-C3 via Serial. Runs in the browser.
ESP32-C3: RGB LEDCycle through red, green, and blue on an RGB LED using GPIO 6, 7, 8 on the ESP32-C3.
ESP32-C3: Button + LEDPress a button on GPIO 9 to toggle an LED on GPIO 8. Tests GPIO input on the browser ESP32-C3 emulator.
ESP32-C3: Serial EchoType in Serial Monitor and see it echoed back by the ESP32-C3 browser emulator.
ESP32-C3: DHT22 Temperature & HumidityRead temperature and humidity with a DHT22 sensor on GPIO3 of the ESP32-C3 RISC-V board.
ESP32-C3: HC-SR04 Ultrasonic DistanceMeasure distance with an HC-SR04 sensor on the ESP32-C3. TRIG on GPIO5, ECHO on GPIO6.
ESP32-C3: PIR Motion DetectorDetect motion with a PIR sensor on GPIO7 of the ESP32-C3. Prints detection events and count to Serial.
Related simulators
Frequently asked questions
- Do ESP32-C3 DevKit sketches run on the SuperMini?
- Yes. Same chip and same emulator; only the pin set differs. The examples listed here are the DevKit's, and they run on the SuperMini after a pin map check.
- Which languages can the SuperMini run?
- Arduino C++, MicroPython and ESP-IDF, switched from the toolbar, exactly like the C3 DevKit.
- Does WiFi work?
- Yes. The emulated radio joins the Velxio-GUEST virtual access point, so HTTP, MQTT and NTP code runs in the browser.
- Is the ESP32-C3 SuperMini simulator free?
- Yes. The ESP32-C3 SuperMini runs on the free plan: open the editor, place the board and press Run. No install and no account are needed, and Velxio's editor and simulator core are open source under the GNU AGPLv3.
- Which languages can I use on the ESP32-C3 SuperMini?
- Arduino C++, MicroPython, ESP-IDF. The language is switched from the toolbar; the circuit on the canvas stays the same.
Ready to simulate the ESP32-C3 SuperMini?
Open the editor, place the ESP32-C3 SuperMini from the picker, wire what you need and press Run.
Launch the ESP32-C3 SuperMini simulator →