GSM3 click

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  • MIKROE-1720
  • MIKROE-1720
  With GSM3 click you can have two of the most used wireless communication protocols in...more
Product information "GSM3 click"


With GSM3 click you can have two of the most used wireless communication protocols in one device — GSM/GPRS and Bluetooth. The click has an onboard 2.4 GHz active antenna, so it is Bluetooth compatible. It carries the SIM800H quad-band GPS/GPRS module from SIMCOM.

GSM3 click is designed to use either 3.3V or 5V power supply and communicates with the target MCU over UART and the following mikroBUS pins: PWM, INT, AN, RST, CS.

Onboard antennas

The click has an SMA antenna connector and an audio input/output pad for connecting a microphone and earphones (which can also be used as an FM antenna).

Quad-band module

SIM800H has world-wide coverage — quad-band frequency: GSM 850, EGSM 900, DCS 1800 and PCS 1900. The module can search four frequency bands automatically.

Low power consumption

Typical power consumption in sleep mode is only 0.7mA. While in sleep mode the SIM800H can still receive SMS.

Key features

  • SIM800H module
    • GPRS data downlink/uplink transfer max: 85.6 kbps
    • Supports GPRS coding schemes CS-1, CS-2, CS-3 and CS-4
    • Integrated TCP/IP protocol stack
    • Supports SIM card: 1.8V, 3V
    • Bluetooth antenna pad
  • Connection pad for audio input/output
  • Interface: UART
  • 3.3V or 5V power supply


Type GSM
Applications GSM is a robust and reliable solution for communicating with your devices. Turn appliances on/off, exchange SMS messages for status updates and so on
On-board modules SIM800H
Key Features 2.4 GHz Bluetooth antenna, GSM antenna connector. SIM card socket integrated at the bottom side of the board
Key Benefits Connection pad for audio input output
Interface GPIO,UART
Input Voltage 3.3V or 5V
Compatibility mikroBUS
Click board size L (57.15 x 25.4 mm)

Pinout diagram

This table shows how the pinout on GSM3 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

NotesPinMikrobus logo.png


Power on status STAT 1 AN PWM 16 PWRKEY Power on/down of the module
Hardware reset of the module RST 2 RST INT 15 CTS Request to send
Clear to send RTS 3 CS TX 14 TXD Transmit data
Not connected NC 4 SCK RX 13 RXD Receive data
Not coneected NC 5 MISO SCL 12 NC Not connected
Not connected NC 6 MOSI SDA 11 NC Not connected
Power supply +3.3V 7 3.3V 5V 10 +5V Power supply
Ground GND 8 GND GND 9 GND Ground


Code examples that demonstrate the usage of GSM3 click with MikroElektronika hardware, written for mikroC, mikroBasic and mikroPascal for PIC are available on Libstock.

Libstock also hosts an alternative extensive GSM library for a variety of hardware setups and with a detailed user manual.

This code snippet shows the initialization routine for the GSM3 click, when used with AT parser.

 1 void GSM3_init( void )
2 {
3     engine_init( gsm_default_handler );
4     hal_gsm_pwr( 0 );
5     Delay_ms( 100 );
6     hal_gsm_pwr( 1 );
7     Delay_ms( 2000 );
8     hal_gsm_pwr( 0 );
10     while( !hal_gsm_stat() );
11     Delay_ms( 10000 );
13     at_cmd( "AT" );
14     at_cmd( "AT+CSCS="GSM"" );
15     at_cmd( "AT+CMGF=1" );
16 }


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