Wokwi Online Simulator: Simulate Arduino & ESP32 IoT Projects

Wokwi Arduino ESP32 Simulator Complete Guide

Introduction: What is Wokwi online Simulator?

Wokwi is a powerful and easy-to-use online simulator for Arduino, ESP32, and IoT projects. Unlike traditional tools that require complex setup and physical hardware, Wokwi allows users to:

Simulate microcontrollers in a browser
Test sensors, actuators, displays, and cloud interaction
Debug and test code before uploading to real hardware
Collaborate and share projects with a simple URL

Whether you’re a student, educator, or IoT developer, Wokwi online simulator empowers you to build, test, and refine your code without touching physical devices.

Why Wokwi online Simulator is Becoming the #1 IoT Simulation Tool

Runs in Browser: No installation or downloads required
Ideal for Beginners: Easy-to-use interface
Supports Advanced Devices: ESP32, ESP8266, Raspberry Pi Pico
Cloud-Compatible Projects: Simulate HTTP, MQTT, JSON, APIs
Real-Time Debugging: View live pin values and memory usage
Open Source + GitHub integration

Getting Started with Wokwi Online Simulator

Step 1: Visit the Wokwi Website

Open your browser and visit: https://wokwi.com
You can see Simulate with Wokwi Online under click, Arduino, ESP32, STM 32, Pi Pico as per your requirement and if you need further guidance click on ‘DOCS’ tab right top corner shown below images

Step 2: Create a New Project

Click “New Project” and select:
- Arduino UNO
- ESP32 DevKit
- ESP8266
A new simulation workspace opens with a code editor, schematic editor, and serial monitor.

Step 3: Write or Paste Your Code

Wokwi supports C/C++ code written in Arduino IDE style. You can directly paste Arduino code into the editor. (check above image)

Step 4: Add Components via Diagram View

Click the “Add Part” button and search for:

Sensors: DHT22, MQ-2, Ultrasonic
Actuators: LED, Servo, Motor
Displays: OLED, LCD 1602, 7-Segment
Communication Modules: MQTT, Wi-Fi, HTTP Client

Drag and drop to connect parts using the graphical interface. (check above image)

Wokwi ESP32 Simulator: ESP32 IoT Projects Made Simple

ESP32 is a popular microcontroller for Wi-Fi and BLE-enabled IoT applications. Wokwi’s simulator for ESP32 supports:

Wi-Fi (simulated)
HTTP GET/POST
MQTT publishing and subscribing
Built-in OLED support
JSON parsing using ArduinoJson

Example Project: Simulate ESP32 + NTP clock

Below is the result of Wokwi ESP32 simulator +NTP clock

Example Project DIY: Simulate ESP32 + DHT22 + MQTT

Goal: Simulate ESP32 reading temperature from a DHT22 sensor and publishing it via MQTT.

Code Overview:

#include <WiFi.h>
#include <PubSubClient.h>
#include "DHT.h"

#define DHTPIN 15
#define DHTTYPE DHT22

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.hivemq.com";
const int mqttPort = 1883;
const char* topic = "iotdunia/dht22";

WiFiClient espClient;
PubSubClient client(espClient);
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  client.setServer(mqttServer, mqttPort);
  dht.begin();
}

void loop() {
  if (!client.connected()) {
    while (!client.connect("ESP32Client")) {}
  }
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  if (!isnan(h) && !isnan(t)) {
    String payload = "{\"temperature\":" + String(t) + ",\"humidity\":" + String(h) + "}";
    client.publish(topic, payload.c_str());
  }
  delay(3000);
}

Wokwi Arduino Simulator: Simulate Arduino Projects on Wokwi

Example Project: Arduino + LED + Push Button

Link: Arduino LED Button Simulation

Highlights:

Turns on LED when button is pressed
Teaches digital input/output

const int buttonPin = 2;
const int ledPin = 13;

void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  int buttonState = digitalRead(buttonPin);
  digitalWrite(ledPin, buttonState);
}

Simulate IoT with Cloud APIs (HTTP + JSON)

Wokwi’s ESP32 simulator allows you to fetch JSON from any public API (like OpenWeatherMap, ThingSpeak, etc.)

Example Project: ESP32 + HTTP GET (OpenWeather API)

Key Features:

Uses HTTPClient.h
Parses JSON with ArduinoJson
Display result on OLED

How Wokwi IoT Simulator works

Advanced Features of Wokwi

Live Serial Monitor

Displays serial data from Serial.print()
Useful for debugging logic and sensor output

MicroPython & AVR Support

Supports MicroPython for ESP32, ESP8266
Emulate ATtiny85 and other microcontrollers

GitHub Integration

Login via GitHub
Save and share projects publicly or privately
Embed Wokwi projects in blogs or LMS

See also:

Conclusion

Wokwi is the perfect tool for:

Students learning Arduino/ESP32
IoT professionals testing concepts
Educators running remote labs

You can now simulate almost any Arduino or ESP32 project entirely online, interact with sensors, debug your code, and even connect to MQTT/HTTP without ever buying hardware.

So before you spend money on physical devices, try Wokwi to build confidence and test your full IoT logic in the cloud.

Frequently Asked Questions (FAQ)

Q1. What is Wokwi?
Wokwi is an online simulator for Arduino, ESP32, ESP8266, and IoT projects that runs directly in your browser.

Q2. Can I simulate cloud-based IoT projects on Wokwi?
Yes, Wokwi supports HTTP, MQTT, JSON, and many real-world IoT scenarios.

Q3. Is Wokwi free?
Yes, Wokwi is 100% free for individuals, educators, and hobbyists.

Q4. Can I save my Wokwi projects?
Yes, you can save and share your projects using a unique Wokwi project URL.

Q5. Does Wokwi support ESP32 and MQTT?
Yes, Wokwi has full support for ESP32, MQTT protocol, and DHT/other sensors.

See also:

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