We can buy ESP32 chips and modules from Espressif and their distributors. Then, we can make our own development board for ESP32. Sometimes, these boards-based ESP32 boards are sold to the public. In this section, we will review two ESP32 development boards.

SparkFun ESP32 Thing is one of the ESP32 development boards from SparkFun. This board uses the ESP32 chip. The board provides TTL USB to make it possible to communicate with the ESP32 chip. In addition, SparkFun ESP32 Thing has an LiPo connector so we can run the board with a battery. For further information about SparkFun ESP32 Thing, you can visit on this site: https://www.sparkfun.com/products/13907. A form of the SparkFun ESP32 Thing board is shown in the following photo:

Adafruit is an electronic manufacturer and electronic product online store. They make a development board-based ESP32 called Adafruit HUZZAH32 – ESP32 Feather Board. This board uses the ESP32 module. Adafruit HUZZAH32 has a TTL USB and LiPo connector like the SparkFun ESP32 Thing board. You can visit https://www.adafruit.com/product/3405 to purchase this board:

Other board-based ESP32 boards can be found on Alibaba and AliExpress. You can search for ESP32 board as keywords. There are many custom development boards with ESP32 chips or modules.

In this book, I use ESP-WROVER-KIT for testing.