SPIRIT click

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  • MIKROE-2568
  • MIKROE-2568
SPIRIT click  carries the  SP1ML  868MHz ultra low-power RF module. The... more
Product information "SPIRIT click"

SPIRIT click carries the SP1ML 868MHz ultra low-power RF module. The board is designed to use 3.3V power supply and 3.3V or 5V I/O voltage levels. It communicates with the target MCU over UART interface, with additional functionality provided by the following pins on the mikroBUS™ line: PWM, RST, CS.

It can be used to wirelessly send and receive UART data.

SP1ML 868MHz RF module features

SP1ML is based on the SPIRIT1 RF sub-GHz transceiver (with integrated SMPS), STM32L1 microcontroller, integrated filter/balun, and chip antenna.

There are two operational modes, command mode and operating mode. The command mode allows module configuration and status interrogation using an extended ‘AT’ style command set. In operating mode the module serves its primary purpose as a wireless transceiver.

In operating mode the module uses only 13.5mA, 2.2mA in command mode, and even lower in stanby with just 1.4µA. This kind of power consumption makes it ideal for smart devices that send small amounts of data.

The module has an integrated antenna and crystal.


Type RF Sub 1GHz
Applications Security systems, mobile health and medicine applications, IoT, wireless metering, etc.
MCU SP1ML 868MHz ultra low-power RF module
MCU Memory 16 kB RAM and 128 kB Flash
Key Features Low data rate, low power sub-GHz transceiver
Interface GPIO,UART
Input Voltage 3.3V or 5V
Compatibility mikroBUS
Click board size M (42.9 x 25.4 mm)

Pinout diagram

This table shows how the pinout on SPIRIT 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 SHDN Shutdown
Reset input, active low RST 2 RST INT 15 NC  
Command mode CMD 3 CS TX 14 TXD UART transmit data
  NC 4 SCK RX 13 RXD UART receive data
  NC 5 MISO SCL 12 NC  
  NC 6 MOSI SDA 11 NC  
Power supply +3.3V 7 3.3V 5V 10 +5V Power supply
Ground GND 8 GND GND 9 GND Ground

Jumpers and settings

LOGIC SEL - used to select 3.3 or 5V logical level for UART communication (J1A in the schematic).


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

General description

The library implements communication protocol between the MCU host and SPIRIT click module. It can work in two modes, command mode and operating mode. The command mode allows module configuration and status interrogation using an extended ‘AT’ style command set. In operating mode the module serves its primary purpose as a wireless transceiver. It uses asynchronous approach to issue commands and receive responses via callback functions.

Code snippet

The code snippet shows an example callback function for the ATO command. It checks if the response is OK to change from library state to operating mode.

01 static bool on_ato(char* response)
02 {
03     if(strcmp(response, "OK") == 0)
04     {
05         LOG_INFO("Entered operating mode.");
07         spirit_mode(SPIRIT_OPERATING_MODE);
08     }
09     else
10     {
11         LOG_ERROR("Failed to enter to operation mode...");
12     }
14     return true;
15 }


  • Configurable command buffer size.
  • Ring buffer for receiving data via UART
  • Supported mikroC compilers for ARM, PIC32, PIC, FT90.
  • Asynchronous command issuing.


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