SPIRIT click
SPIRIT click

Description of product

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.

Specifications

TypeRF Sub 1GHz
ApplicationsSecurity systems, mobile health and medicine applications, IoT, wireless metering, etc.
MCUSP1ML 868MHz ultra low-power RF module
MCU Memory16 kB RAM and 128 kB Flash
Key FeaturesLow data rate, low power sub-GHz transceiver
InterfaceGPIO,UART
Input Voltage3.3V or 5V
CompatibilitymikroBUS
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).

Notes                               Pin            Mikrobus logo.png                    Pin           Notes
NC1ANPWM16SHDNShutdown
Reset input, active lowRST2RSTINT15NC
Command modeCMD3CSTX14TXDUART transmit data
NC4SCKRX13RXDUART receive data
NC5MISOSCL12NC
NC6MOSISDA11NC
Power supply+3.3V73.3V5V10+5VPower supply
GroundGND8GNDGND9GNDGround

Jumpers and settings

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

Programming

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.");
06 
07         spirit_mode(SPIRIT_OPERATING_MODE);
08     }
09     else
10     {
11         LOG_ERROR("Failed to enter to operation mode...");
12     }
13 
14     return true;
15 }

Features

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

Downloads