12. You can input AT+HELP=ALL to query all AT Command information

Fig1: Enter AT+HELP=? to get AT Command List

Bluetooth Connection

Before using BLE4.1 series devices, it is better to know some key buttons first.

 BOOT: Update Bluetooth firmware/Enable the approach connection (<10cm).

Firmware update**: Press and hold the "BOOT" button until you plug USB cable, entering

firmware update mode. For any enquiry, please refers to the part: Firmware Update. (You

can release your hand after you plugged the USB cable.)

Approach connection**: Press and hold the host BOOT button, approach the slave

Bluetooth device to connect.

 WAKEUP: the button can wake up the device from low-power consum[ption mode (you can

also connect this pin to MCU to realize the same function)

 RST: BLE4.1 reset button

Below is the BLE4.1 minimum system circuit diagram for your reference: Fig1: the BLE4.1

minimum system circuit diagram