RN4871 click

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  • MIKROE-2544
  • MIKROE-2544
RN4871 click  carries the  RN4871   Bluetooth®  4.2 low energy module from... more
Product information "RN4871 click"

RN4871 click carries the RN4871 Bluetooth® 4.2 low energy module from Microchip. The click is designed to run on a 3.3V power supply. It uses ASCII Command Interface over UART for communication with target microcontroller, with additional functionality provided by the following pins on the mikroBUS™ line: RST, CS, and INT.

RN4871 module features

The RN4871 Bluetooth Low Energy module integrate Bluetooth 4.2 baseband controller, on-board Bluetooth stack, digital and analog I/O, and RF power amplifier into one solution.

The module contains an integral ceramic chip antenna.

All products in the RN series can be dynamically configured by the host microcontroller with a few simple ASCII commands.

The RN4871 supports both peripheral and central Generic Access Profile (GAP) roles, actively scanning for other connectable devices instead of waiting for incoming connection requests. The peripherals are usually small, low power devices like sensors and monitors, that broadcast information to the central device. The central device can communicate with multiple peripherals.

RN4871 click features



Type Bluetooth,BLE
Applications Health/Medical Devices, Sports Activity/Fitness Meters, Beacon Applications, Internet of Things (IoT) Sensor Tag, Remote Control, Wearable Smart Devices and Accessories, Smart Energy/Smart Home, Industrial Control
On-board modules RN4871 Bluetooth module from Microchip
Key Features Low energy module
Interface UART,GPIO
Input Voltage 3.3V
Compatibility mikroBUS
Click board size M (42.9 x 25.4 mm)

Pinout diagram

This table shows how the pinout on RN4871 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

NotesPinMikrobus logo.pngPinNotes
  NC 1 AN PWM 16 NC  
Module Reset RST_N 2 RST INT 15 UART_CTS UART Clear To Send
UART Ready To Send UART_RTS 3 CS TX 14 UART_TXD UART Data output
  NC 4 SCK RX 13 UART_RXD UART Data input
  NC 5 MISO SCL 12 NC  
  NC 6 MOSI SDA 11 NC  
Power supply +3.3V 7 3.3V 5V 10 NC  
Ground GND 8 GND GND 9 GND Ground

Maximum ratings

Supply Voltage 1.9   3.6 V
Frequency Band 2.402   2.480 GHz
Operating Temperature Range -20°C   +70°C  
Sensitivity   90dBm    


Code examples for RN4871 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet shows send function for RN4xxx clicks. If the message type is correct, it will estabilish connection with the device specified by the address in the parameter and then send the properly formated data.

01 #define BTCMD( TXT ) UART2_Write_Text( TXT )
02 void RN4xxx_send(char *pAddr, T_RN4xxx_message msgData )
03 {
04    static char msgTxt [255];
06    if (msgData.msgType ==  'Q')
07    {
08        /*Connects to a device with specified adress*/
09        BTCMD("C,1,");
10        BTCMD (pAddr);
11        BTCMD("r");
12        Delay_ms(3000);
13        /*Secures the connection, entering data stream mode*/
14        BTCMD("Br");
15        Delay_ms(3000);
16    }
17    /*Sentence construction */
18    msgTxt[0] = '#';
19    msgTxt[1] = msgData.msgType;
20    msgTxt[2] = ',';
21    msgTxt[3] = msgData.dataType/0x100;
22    msgTxt[4] = msgData.dataType%0x100;
23    msgTxt[5] = ',';
24    msgTxt[6] = msgData.id;
25    msgTxt[7] = ',';
26    msgTxt[8] = '';
27    strcat (msgTxt, msgData.payload);
28    strcat (msgTxt, "*rn");
30    BTCMD ( msgTxt );
32    if (msgData.msgType ==  'Q')
33    {
34        Delay_ms(3000);
35        /*Enters CMD mode*/
36         BTCMD("$");
37        Delay_ms(100);
38        BTCMD("$$$");
39        Delay_ms(1000);
40        /*Kills connection*/
41        BTCMD("K,1r");
42        Delay_ms(500);
43    }
44 }


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