FireBeetle ESP32 IOT Microcontroller DFRobot FireBeetle ESP32 IOT Microcontroller is a low-power consumption microcontroller designed for Internet of Things (IoT) projects. The FireBeetle Board integrates a Dual-Core ESP-WROOM-32 ESP32 WiFi-BT-BLE MCU Module for Wi-Fi and BLUETOOTH® dual-mode communication. The board has a 10μA electric current in deep-sleep mode and the main controller supports USB and 3.7V external lithium battery power supply methods. The USB and external DC can charge the LiPo battery directly.