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Simulator

ESP32 and Arduino simulator in your browser

Your firmware, the program on your board, runs on a 3D workbench with your parts and wires. Press a button or drag a sensor, and the screens, LEDs and serial monitor react.

Runs 260 boards: ESP32, ESP32-S3, ESP32-C3, ESP32-C6, Arduino Uno, Nano, Mega and Raspberry Pi Pico. To try it, open a project, pick Preview and press Run.

See examples
An ESP32, an OLED, a buzzer and three LEDs joined by jumper wires on a green mat. As a distance slider drops, the OLED counts down and the lit LED moves from green to yellow to red.
Drag the distance down and the OLED counts it while the LEDs go from green to red. ESP32 ultrasonic parking sensor

What it can show you

A small OLED on the green mat reads ClawdBot Tamagotchi with mood, care and idle lines, with Feed, Play and Sleep buttons in the panel beside it.

OLED screens

Press Feed, Play or Sleep and the pet's mood changes on a 128x64 OLED. ClawdBot tamagotchi

A Waveshare ESP32-C6 LCD board from above, its screen showing orange fish, dark teal water and tan sand.

Color screens

Orange fish swim over tan sand on the color LCD built into this ESP32-C6 board. Aquarium from our ESP32 coding test

A black ESP32-C6 touch board from above with a white cartoon face on its screen, blinking and changing expression.

Touchscreens

Tap the screen with the touch controls and the face reacts. Tiny ESP DeskBuddy

An ESP32, an OLED showing a status word and a strip of LEDs on the green mat, with motion sensor and button controls in the panel.

LED strips

Flip the motion sensor or press the button. The screen goes from FREE to HERE to BUSY and the LEDs change color. Desk presence busy light

From above, a lilac block labeled SG90 Lock Servo with a white arm that swings when a card is scanned, next to an OLED and an ESP32.

Servos

Scan a card and the servo arm swings while the OLED says UNLOCKED. This servo has no 3D model yet, so it gets a labeled stand-in body. RFID treasure chest

An Arduino Uno and a buzzer on the green mat. A light sensor slider drops and the serial monitor panel fills with lines saying Intruder detected.

Arduino and the serial monitor

Drag the light sensor down on an Arduino Uno and the serial monitor prints Intruder detected. Laser tripwire alarm

A Raspberry Pi Pico, a red button and an OLED on the green mat. The OLED shows a small blue face that blinks and looks side to side.

Raspberry Pi Pico

A short sketch we wrote for this page: press the button and the face changes mood. Pico projects

The same firmware on a real board

We flashed real boards, then ran the exact same firmware in the simulator. All 12 OLED builds closely matched the real board, down to the scenes, text and timing. On the C6's color LCD the layout and motion matched, and the colors looked different on camera.

Read the ESP32 coding test
Three builds side by side, each shown in the simulator and filmed on the real board: a night drive on an OLED that looks the same in both, then an aquarium and an aurora scene on a color LCD with different colors on camera.

Boards it runs

The simulator runs 260 boards today. Arduino sketches run on all of them. ESPHome projects run on every ESP32, ESP32-S3, ESP32-C3 and ESP32-C6 board. ESP-IDF projects run on the 23 ESP32 and ESP32-S3 boards we've verified, like the DevKit v1 and ESP32-S3-DevKitC-1. Boards without a simulator profile aren't offered, and you can still Deploy to them.

  • ESP32151 boards

    DevKit v1, Cheap Yellow Display, Adafruit Feather V2

  • ESP32-S373 boards

    DevKitC-1, XIAO ESP32S3, M5Stack CoreS3

  • ESP32-C319 boards

    DevKitM-1, C3 Super Mini, XIAO ESP32C3

  • ESP32-C66 boards

    DevKitC-1, Waveshare C6 Touch LCD, XIAO ESP32C6

  • Arduino5 boards

    Uno, Nano, Mega

  • RP20406 boards

    Raspberry Pi Pico, Pico W, Nano RP2040 Connect

What runs in it

What you see

  • OLEDs, character LCDs and color screens
  • LED strips and plain LEDs that dim and brighten
  • Servos that swing
  • Jumper wires between parts

What you control

  • Buttons, rotary encoders, joysticks and keypads
  • Touchscreens, RFID cards and gestures
  • Distance, light and weight sliders
  • 58 I2C sensor models
  • Your webcam on ESP32-S3 boards, your microphone on all ESP32 chips

What you get around the run

  • Serial monitor, both ways
  • Buzzers you can hear
  • Virtual Wi-Fi on ESP32 chips
  • Pause, stop, reset, orbit, zoom and drag parts

Try it on your project

  1. Describe a project to Schematik, or open one from the community.
  2. Open the Preview tab to see your board and parts on the mat.
  3. Press Run. The first run takes a minute or two while your firmware compiles.
Browse ESP32 projects

What it leaves out

  • It runs firmware and doesn't model voltage or current, so a wrong resistor or a swapped wire won't show up here. Wires come from your pin assignments.
  • Parts without a 3D model get a generated or stand-in body, and an icon in the simulator tells you.
  • Steppers, DC motors and relays stay still.
  • Arduino and RP2040 runs have no Wi-Fi, and Bluetooth isn't simulated on any board.
  • Running a project needs a Schematik account.

Questions

Yes. Schematik compiles your project and runs the firmware in your browser on ESP32, ESP32-S3, ESP32-C3 and ESP32-C6 boards. Nothing to install and no board needed.