ESP 32 WROOM 32D ESP32 ESP32D DEVKITC V4 ESP32-DevKitC Development Board with WROOM-32D module ESP32-DevKitC V4 is a small-sized ESP32-based development board produced by Espres-sif. Most of the I/O pins are broken out to the pin headers on both sides for easy interfacing. Developers can either connect peripherals with jumper wires or mount ESP32-DevKitC V4 on a breadboard.