ESP32 guides, components and practical projects
Start by uploading a Serial sketch, then build LED, button, DHT11 and OLED circuits using step-by-step wiring and Arduino code.
Follow this order with a classic ESP32 WROOM DevKit and Arduino-ESP32 3.x. Each guide explains its exact hardware assumptions. Finish each expected result before moving on.
Install the board package, select your board and port, then verify a Serial-only upload.
Parts: ESP32 DevKit, data-capable USB cable and computer.
Before you start: Start here; no circuit or onboard LED is required.
Wire an external LED and control a digital output.
Parts: Add an LED, 220 ohm resistor, breadboard and jumper wires.
Before you start: First confirm the Serial upload in step 1 works.
Read a button with INPUT_PULLUP and use it to control the LED.
Parts: Add a pushbutton; reuse the LED circuit and breadboard.
Before you start: First make the external LED blink in step 2.
Install a sensor library and read temperature and humidity in Serial Monitor.
Parts: Add a DHT11; check the guide for bare-sensor versus module wiring and pull-up requirements.
Before you start: Keep the working upload setup and practise the button wiring before adding a sensor.
Wire an SSD1306 I2C OLED and show text. Combining sensor values is a later exercise.
Parts: Add the guide’s 128×64 SSD1306 I2C OLED; verify its supply and signal requirements.
Before you start: Use the library-installation and Serial Monitor skills from step 4.
Need background first? Read What is ESP32? and the DevKit board guide. After these five steps, choose a sensor path or display path.
Find what you need
Understand ESP32 from the ground up.
Build practical ESP32 systems.
Understand the parts before wiring.
Project discovery
Working builds with sensors, displays, and connected outputs.
Good first builds when you want quick wiring, visible output, and a clear result.
Low-risk projects that teach one circuit idea at a time.
Robotics, automation, camera systems, networking, and multi-sensor builds.
Need something specific? Try the header search for OLED, BME280, DHT22, Wi-Fi, Bluetooth, GPIO, relay, RFID, camera, robot, or sensor.
Project finder
Best First
Classroom ESP32 trainer with a push button on GPIO12 and status LED on GPIO14.
Build projectNext Challenge
Build an ESP32 HC-SR04 distance monitor with TRIG GPIO5, ECHO GPIO18 through a 10 kOhm / 20 kOhm divider, 5 V sensor…
Build projectAdvanced Upgrade
Build an ESP32 SSD1306 weather clock with BME280 readings, NTP time, timezone rules and Wi-Fi recovery.
Build projectLaunch picks
Hand-picked from the live catalog — start with any row below.
Featured Component
One I2C chip reads temperature, humidity, and barometric pressure — the upgrade path when you want real weather data from a single module.
Why ESP32 Engine
Open forever
No paywalls. No login required. No premium tier. Every guide, project, and component page is free.
Clear difficulty labels
Each public project shows the difficulty level supported by its wiring, code, and source content.
Built for parents
Safety notes, simple explanations, and age-appropriate language. Designed for supervised learning from age 10+.
Ready for classrooms
Structured missions, printable notes, and content that supports hands-on STEM learning.
Works on any device
Every page is mobile-first — follow a guide on your phone while you build at the bench.
Made for real making
Every guide has wiring tables, copy-paste Arduino code, a troubleshooting section, and a real working output.
For adults helping learners
Start with low-voltage projects, supervise wiring changes, and ask learners to explain what changed before powering the circuit again.
Use compact missions and fully reviewed projects for short classroom experiments, skill progression, and evidence-based troubleshooting.
