Arduino Tutorial

Choose a suitable Arduino board

Considering low power consumption, we select Arduino Pro Mini @3.3V 8MHz as Bootloader

for FireBeetle BLE4.1 microcontrollers.

Fig2: FireBeetle Board-328P with BLE4.1

Special Note: Pro Mini uses 8MHz OCXO. Its processing speed is relatively slow for

115200-baud rate. The high baud rate may lead to unreadable code and packet loss

etc. 9600-baud rate is recommended.

Low Power Consumption Mode

BLE 4.1 switch to low power consumption mode with AT command: AT+LOWPOWER=ON.

The Bluetooth can still broadcast and connect in the low power mode. When the Bluetooth

received data, it will awake automatically and send an interrupt signal to the chip: 328p. The

interrupt pin here should be connected to D2 of 328p which is interrupt 0 in the code.