Source: https://mokxi.com/learn/esp32-course Updated: 2026-11-11 Embedded track ESP32 # An ESP32 course, from first light to WiFi and BLE Pins at 3.3 V, interrupts, a screen and NeoPixels on the ESP32-C3, then WiFi, a web server, MQTT, ESP-NOW and Bluetooth on the ESP32. Free In your browser 3 courses, 27 lessons, about 21 hours Start free First light on the C3 See the course Overview ## How you will learn it The ESP32 is the board most connected projects use: cheap, fast and with WiFi and Bluetooth built in. It also has its own rules, from 3.3 V pins to a different PWM peripheral, which is why it gets a course of its own. Embedded on the ESP32-C3 covers the board itself: pins, interrupts, Serial, an OLED and NeoPixels, ending in a memory game and a console. Connected devices then takes it online, one protocol per lesson. Outcomes ## What you will learn - Wire inputs and outputs for 3.3 V logic and use interrupts well. - Drive an I2C OLED and a strip of addressable LEDs. - Join WiFi, call an API and serve a web page from the board. - Write MQTT publish code, send data peer to peer with ESP-NOW and make a BLE device a phone can find. Your route ## The courses and lessons to take Every lesson opens in the editor right away, signed in or not, and the simulator checks each step. - Step 1 · 13 lessons · 11 h ### Embedded on the ESP32-C3 The board itself, from first light to a console. - First light on the C3 One pin, one lamp, one program on a RISC-V board. Why 3.3 V changes the resistor you pick, and what the board does while it waits. - Interrupts, and what they cost A handler that runs the moment a pin falls, a counter shared with the main loop, and the bounce that makes one press count as four. - A screen on two wires A 128x64 OLED over I2C, bit-banged on two pins. Addresses, acknowledgments, a frame buffer in RAM, and what a redraw costs. - Color on one wire Sixteen addressable LEDs on a single pin, and a protocol where the length of a pulse is the bit. The timing is the whole problem. Every lesson in the course - Step 2 · 7 lessons · 4 h ### Connected devices WiFi and radio, one protocol per lesson. - Joining WiFi The connect loop every connected device starts with: WiFi.begin, the states a station walks through, the address DHCP hands out, and what a wrong password and a wrong network name look like. - A web server The board serves a page: a WiFiServer on port 80 reads the browser’s request a line at a time, switches two LEDs from the path, and prints the page back. - MQTT with PubSubClient Publish and subscribe through a broker: topics, payloads, QoS and retained messages, the PubSubClient connect loop with its error codes, and the same reading sent over HTTP where the simulator has no broker. - BLE: a lamp your phone can find Bluetooth Low Energy the way phones see it: a GATT server with the Nordic UART service, a characteristic to write, notifications back, and advertising again after a phone leaves. Every lesson in the course - Step 3 · 7 lessons · 6 h ### Build a handheld game console A build to finish with: a handheld game console on the C3. Wire a color screen, buttons and sound to an ESP32-C3, one working step at a time, and finish with three games you can play. Every lesson in the course Keep going ## Guides and tools on the same subject Simulator ### ESP32 simulator Open it Guide ### ESP32 projects for beginners Open it Guide ### ESP32-C3 SuperMini pinout Open it Track ### Embedded track Arduino, ESP32, Raspberry Pi Pico and STM32: pins, timing, buses, motors, WiFi, registers and debugging, every lesson checked on a simulated board. See the whole track Questions ## Questions people ask Should I learn Arduino before the ESP32? It helps but is not required. The ESP32-C3 course starts at first light. If you have never written a sketch, Embedded on the Arduino Uno is the gentler start. Can a simulator really do WiFi? Yes. Connected devices runs the WiFi, web server, ESP-NOW and BLE code on a simulated ESP32, so you can see each request and reply. MQTT is the one exception: the simulator has no broker, so that lesson sends the same reading over HTTP. Which ESP32 does the course use? The ESP32-C3, a RISC-V chip, for the board course, and the classic ESP32 for Connected devices. The code carries over to other ESP32 boards with small pin changes.