Bluetooth click

With the range up to a 100m and low power consumption, Bluetooth click is a great solution if you are looking for a simple way to integrate Bluetooth 2.1 communication to your device. It features the RN-41 low power, class 1 Bluetooth radio module. Bluetooth click communicates with the target board MCU through UART interface and is designed to run on 3.3V power supply only.

RN-41 module

The RN-41 Class 1 Bluetooth radio module delivers up to a 3-Mbps data rate, for distances up to 100 meters (class 1 radio).

Bluetooth 2.1

Bluetooth 2.1 + EDR version includes sniff subrating, a feature that significantly increases battery life for devices that have long periods in idle mode, like home sensor networks, headsets, etc. The host can specify maximum transmit and receive latencies, so that a device knows how often in a cycle it needs to enter sniff mode.

Power consumption

The average power consumption in normal mode is 30mA, 8mA in low-power sniff mode, and only 2.5mAin stand-by mode.

Low power consumption and high data rates make this click the best choice in barcode scanners, measurement and monitoring systems, industrial sensors and controls, medical devices, asset tacking, etc.

Specification

Key features

• RN-41 module
  • Bluetooth® version 2.1 module
  • Low power (30 mA connected, <10 mA sniff mode)
  • 3-Mbps data rate for distances up to 100 meters
• Interface: UART
• 3.3V power supply

Pinout diagram

This table shows how the pinout on Bluetooth click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin	mikroBUStm				Pin	Notes
Not connected	NC	1	AN	PWM	16	NC	Not connected
Active-low reset	RESET	2	RST	INT	15	NC	Not connected
Not connected	NC	3	CS	TX	14	TX	UART transmit
Not connected	NC	4	SCK	RX	13	RX	UART receive
Not connected	NC	5	MISO	SCL	12	RTS	UART RTS, goes high to disable host transmitter
Not connected	NC	6	MOSI	SDA	11	CTS	UART CTS, if set high, it disables transmitter
Power supply	+3.3V	7	3.3V	5V	10	NC	Not connected
Ground	GND	8	GND	GND	9	GND	Ground

Programming

The following code snippet shows how to change the default Bluetooth device name.

 1 void  BT_new name()
2 {
3     do {
4         UART1_Write_Text( "$$$" );                    // Enter command mode
5         Delay_ms( 500 );
6     } while ( BT_Get_Response() != BT_CMD );
7     do {
8         UART1_Write_Text( "SN,BlueTooth-Click" );     // Name of the device
9         UART1_Write( 13 );                            // CR
10         Delay_ms( 500 );
11     } while ( BT_Get_Response() != BT_AOK );
12 }

Code examples that demonstrate the usage of Bluetooth click with MikroElektronika hardware, written for mikroC, mikroBasic and mikroPascal for ARM, dsPIC and PIC are available on Libstock.