pThe main aim of this book is to teach the Arduino IDE and MicroPython programming languages in ESP32 based projects, using the highly popular ESP32 DevKitC development board. Many simple, basic, and intermediate level projects are provided in the book using the Arduino IDE with ESP32 DevKitC. All projects have been tested and work. Block diagrams, circuit diagrams, and complete program listings of all projects are given with explanations. In addition, several projects are provided for programming the ESP32 DevKitC using MicroPython. The projects provided in this book are designed to teach the following features of the ESP32 processor:/pulliGPIOs/liliTouch sensors/liliExternal interrupts/liliTimer interrupts/liliI²C and I²S/liliSPI/liliPWM/liliADC/liliDAC/liliUART/liliHall sensor/liliTemperature sensor/liliInfrared controller/liliReading and writing to SD card/liliReading and writing to flash memory/liliRTC timer/liliChip ID/liliSecurity and encryption/liliWi-Fi and network programming/liliBluetooth BLE programming/liliCommunication mobile devices/liliLow power design/liliESP-IDF programming/li/ulpThe projects have been organized with increasing levels of difficulty. Readers are encouraged to tackle the projects in the order given. A specially prepared hardware kit is available from Elektor. With the help of this hardware, it should be easy and fun to build the projects in this book./p