Board Overview

Fig1: FireBeetle Board-328P with BLE4.1 PinOUT

LED indicators



RX: Serial data receiving indicator, light up when receive serial data



TX: Serial data transmitting indicator, light up when send serial data



CHG: Battery charge indicator: Flash without lithium battery; Light ON in charging; Light OFF when

full charged



LINK: a Bluetooth connect indicator; when Bluetooth connect to the device successfully, LINK will

light for 3s and blink for every 3s, light OFF when disconnected.

Buttons



BOOT: Bluetooth firmware update; enable KISS connection (approach connection).

Firmware update: please press and hold BOOT button and power-up (plug in USB), turning to the

firmware update mode. For any enquiries, please refers to the part: Firmware Update.

Approach connection: please hold the central BOOT button when it is in the working mode,

approaching the peripheral Bluetooth device and connect.



RST Arduino Reset button

Note: VCC is the output voltage of the power supply (USB power supply: 5V, lithium

battery power supply: 3.7V)