IoTSimulator

Online ESP32 simulator

Simulate ESP32-C3 RISC-V directly in your browser. Wire sensors, run real Arduino C++ sketches, and plot live telemetry curves in real time.

Start simulating freeView workspace demo

The ESP32 simulator in action

Real C++ editor on the left, interactive circuit canvas on the right, and AI copilot ready to help.

IoTSimulator Studio
IoTSimulator ESP32 workbench screenshot showing ESP32-C3 connected circuit and code editor

How to simulate ESP32 in 3 simple steps

Skip downloading gigabytes of ESP-IDF toolchains. Prototype wireless IoT in seconds.

1
Pick ESP32-C3 board and parts
Start with the modern 32-bit RISC-V ESP32-C3 board. Add LEDs, resistors, ultrasonic sensors, and displays with snap-to-grid placement.
2
Wire with 3.3V logic protection
Route neat orthogonal jumper wires between board GPIO pins and components with color coding and short-circuit warnings.
3
Write code and inspect telemetry
Write standard Arduino C++ in the Monaco editor. Compile in under 1 second and monitor live waveforms on the real-time serial plotter.

Everything you need to build and test

From modern RISC-V GPIO experiments to real-time serial waveform plotting.

Modern 32-bit RISC-V core with 3.3V logic

Simulate the modern ESP32-C3 microcontroller running at 160MHz directly in your browser. Practice with 3.3V GPIO pins and analog sensors safely.

  • Accurate ESP32-C3 RISC-V CPU execution in WebAssembly
  • True 3.3V GPIO logic and high-resolution ADC analog pin calculations
  • Direct compatibility with standard Arduino C++ functions and libraries
IoTSimulator
ESP32-C3 DevKit RISC-V code editor and simulation workbench

Supported ESP hardware and boards

Full peripheral emulation supporting 3.3V logic and multi-core execution.

ESP32-C3 DevKit

ESP32-C3 DevKit

Modern 32-bit RISC-V microcontroller with true 3.3V GPIO simulation, ADC readings, and C++ sketch execution.

Core:Single-core RISC-V (160 MHz)
Voltage:3.3V Logic Level
Memory:400 KB SRAM, 4 MB Flash
Simulate ESP32-C3 DevKit
ESP32 DevKit V1

ESP32 DevKit V1

The classic dual-core workhorse. Currently in development for upcoming multi-core emulation updates.

Core:Xtensa dual-core (240 MHz)
Voltage:3.3V Logic Level
Memory:520 KB SRAM, 4 MB Flash
Coming Soon in Roadmap
NodeMCU ESP8266

NodeMCU ESP8266

Popular budget microcontroller for simple smart relays. Currently planned for upcoming simulation roadmaps.

Core:Tensilica L106 (80/160 MHz)
Voltage:3.3V Logic Level
Memory:80 KB user RAM, 4 MB Flash
Coming Soon in Roadmap

Support a vast library of IoT components

Every 3.3V sensor, actuator, and display you need to build realistic virtual IoT prototypes.

Sensors & Inputs

15+ Parts
DHT22 / DHT11
DHT22 / DHT11
Temp & Humidity
HC-SR04
HC-SR04
Ultrasonic Sonar
PIR Sensor
PIR Sensor
Motion Detector
MPU6050
MPU6050
6-Axis Gyro & Accel
Photoresistor
Photoresistor
LDR Light Sensor
Potentiometer
Potentiometer
Analog Rotary Dial
Gas Sensor
Gas Sensor
MQ-2 Gas & Smoke
Flame Sensor
Flame Sensor
IR Fire Detector
Tilt Switch
Tilt Switch
Ball Tilt Angle
Sound Sensor
Sound Sensor
Acoustic Trigger

Actuators & Outputs

14+ Parts
SG90 Servo
SG90 Servo
180° Angle Actuator
5V Relay Module
5V Relay Module
High Voltage Switch
Buzzer
Buzzer
Piezo Tone Generator
Stepper Motor
Stepper Motor
Precision Rotation
RGB LED
RGB LED
Multi-Color Diode
Pushbutton
Pushbutton
Tactile Momentary
Slide Potentiometer
Slide Potentiometer
Linear Fader Dial
DIP Switch 8
DIP Switch 8
8-Way Bus Switch
Rotary Encoder
Rotary Encoder
Incremental Dial
Slide Switch
Slide Switch
SPDT Toggle Switch

Displays & Modules

10+ Parts
SSD1306 OLED
SSD1306 OLED
128x64 I2C Graphic
16x2 / 20x4 LCD
16x2 / 20x4 LCD
Alphanumeric Display
7-Segment Display
7-Segment Display
Multiplexed Digits
Neopixel Matrix
Neopixel Matrix
Addressable RGB Grid
DS1307 RTC
DS1307 RTC
Real-Time Clock
MicroSD Card
MicroSD Card
SPI Data Logger
Membrane Keypad
Membrane Keypad
4x4 Matrix Input
LED Bar Graph
LED Bar Graph
10-Segment Level
LED Ring
LED Ring
Circular Neopixels
Breadboard
Breadboard
Full Breadboard Rails

Ready-to-run starter projects

Open working ESP32 circuits with code and breadboard wiring pre-assembled in one click.

Explore all projects
ESP32-C3 Digital ThermometerRun

ESP32-C3 Digital Thermometer

Simulate high-accuracy temperature and humidity readings with DHT22 and LCD1602.

ESP32-C3 • DHT22Launch
ESP32-C3 NeoPixel Mood LampRun

ESP32-C3 NeoPixel Mood Lamp

Addressable RGB NeoPixel ring animation and smooth color fade patterns.

ESP32-C3 • NeoPixel RingLaunch
ESP32-C3 Ultrasonic TelemetryRun

ESP32-C3 Ultrasonic Telemetry

Real-time sonar distance measurement streamed to live telemetry serial plotter.

ESP32-C3 • HC-SR04Launch
ESP32-C3 Servo Angle ControllerRun

ESP32-C3 Servo Angle Controller

Smooth PWM servo motor position control driven by analog rotary potentiometer.

ESP32-C3 • SG90 ServoLaunch

Frequently asked questions

Common questions about virtual WiFi, MQTT streams, and 3.3V logic level compatibility.

Yes! IoTSimulator is 100% free for students, makers, and educators. You can design circuits, compile Arduino C++ sketches, and plot telemetry with zero subscription fees.
IoTSimulator features full hardware emulation for the ESP32-C3 DevKit (32-bit single-core RISC-V at 160MHz) with 3.3V GPIO logic and accurate ADC pin calculations.
No! Setting up the ESP32 toolchain on a local computer takes gigabytes of disk downloads. On IoTSimulator, our cloud server compiles standard Arduino C++ sketches in under 1 second.
Any numerical values printed over Serial.println() are automatically plotted as live multi-channel waveforms in the built-in Serial Plotter tab, perfect for sensor distance and analog voltage monitoring.
Yes! You can copy your working C++ sketch directly into the official Arduino IDE or VS Code PlatformIO and flash your physical board via USB with zero code changes.