Skywire Click

Skywire™ click is an adapter click, which hosts NimbeLink/Skywire™ cellular modems (using stacking headers) to MikroElektronika development boards. It carries the MCP1826 low dropout regulator from Microchip. Skywire™ click is designed to run either on 3.3V or 5V power supply. The click communicates with the target MCU over UART interface, and the following mikroBUS™ pins: PWM, AN, INT, RST, CS.

NOTE: the Skywire™ modem and the Thermo 3 click are not included in this offer.

Additional mikroBUS™ socket

Skywire™ click has the capability to host an additional mini sized click board™. It also has its own power supply to make the needed voltage for the modules.

Skywire cellular modems

Skywire™ cellular modems are the smallest on the market today. This product family from NimbeLink covers everything from 2G and 3G to LTE. They all share the same footprint and pinout, and are flexible for implementation.

Specifications

Pinout diagram

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

Notes	Pin					Pin	Notes
Enable	EN	1	AN	PWM	16	CTS	Clear To Send
RESET	RST	2	RST	INT	15	AD1_J	ADC IN
Request To Send	RTS	3	CS	TX	14	TX	UART transmit
	NC	4	SCK	RX	13	RX	UART receive
	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

The following table describes the functions of the onboard jumpers.

Programming

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

Code snippet

The following code snippet starts the main function in the Skywire application.

This is a simple main function, which excepts a call and replies with an SMS to caller. The content of the SMS is the current temperature measurement in degrees Celsius.

01: void main()
02: {
03:     measure_f = false;
04:     system_init();
05:     skywire_power_on();
06:     at_init( rsp_handler, UART3_Write, buffer, sizeof( buffer ) );
07:     at_cmd_save( "+CLCC", 1000, NULL, NULL, NULL, callerid_handler );           // Assigning caller ID handler
08:     at_cmd_single( "AT" );
09:     at_cmd_single( "AT+CSCS="GSM"" );
10:     at_cmd_single( "AT+CMGF=1" );
11:     while( 1 )
12:     {
13:         at_process();
14:         
15:         if( measure_f )
16:         {
17:             measure_temp();
18:             at_cmd_single( "AT+CLCC" );
19:             at_cmd_single( "ATH" );
20:             Delay_ms( 2000 );                                                   // Delay needed after ATH
21:             reply_to_caller();
22:             measure_f = false;
23:         }
24:     }
25: }