GSM/GNSS 2 click
PID: MIKROE-2440
GSM/GNSS 2 click combines GPS/GLONASS location tracking with GSM module capability
for mobile communication. The click carries SIM868 quad-band GSM/GPRS module.
GSM/GNSS 2 click is designed to run on either 3.3V or 5V power supply. It communicates with
the target MCU over UART interface with additional functionality provided by the following
pins on the mikroBUS™ line: AN, RST, CS, PWM, INT.
When connected to a GPS antenna, it can receive GPS coordinates, time, and other information
from orbiting satellites.
SIM868 module features
SIM868 is integrated with a high-performance GSM/GPRS engine and a GNSS engine.
Quad‐band frequencies
SIM868 is a quad-band GSM/GPRS module that works on frequencies GSM 850MHz, EGSM
900MHz, DCS 1800MHz and PCS 1900MHz.
SIM868 features GPRS multi-slot class 12/class 10 (optional) and supports the GPRS coding
schemes CS-1, CS-2, CS-3 and CS-4. The GNSS solution offers best-in-class acquisition and
tracking sensitivity, Time-To-First-Fix (TTFF) and accuracy.
Power consumption
SIM868 is designed with a power saving technique so that the current consumption is as low as
0.65mA in sleep mode (with GNSS engine powered down).
GPS and GLONASS
GNSS stands for Global Navigation Satellite System, an umbrella term that describes both the
United States GPS and the Russian GLONASS global positioning systems. GLONASS is
an acronym for Globalnaya Navigatsionnaya Sputnikovaya Sistema (Global Navigation Satellite
System).
GPS currently has 33 satellites in orbit, and GLONASS has 24. This two-constellation system is
particularly suitable for urban areas with high-rise buildings and complex environments.
GLONASS is suited for usage in high latitudes (north or south), where getting a GPS signal can
be difficult.
Key features
SIM868 module
o Quad‐band 850/900/1800/1900MHz
o GPRS class 12: max. 85.6 kbps (downlink/uplink)
o GPRS mobile station class B
GPS antenna connector
GNSS antenna connector
SIM card socket
microSD card socket
UART interface
3.3V or 5V power supply
Specification
Product Type
Applications
MCU
Key Features
Interface
Power Supply
Compatibility
Click board size
GSM - GPS
Navigation, surveying and mapping, asset tracking, etc.
SIM868 Quad-Band GSM/GPRS module
GPS antenna connector, GNSS antenna connector, SIM card socket
UART
3.3V or 5V
mikroBUS
L (57.15 x 25.4 mm)
Pinout diagram
This table shows how the pinout on GSM/GNSS 2 click corresponds to the pinout on the
mikroBUS™ socket (the latter shown in the two middle columns).
Notes
Pin
Pin
Notes
mikroBUStm
SIM card detection
DET
1
AN
PWM
16
RING
Ring indicator
SIM reset
RST
2
RST
INT
15
CTS
Clear to send
Request to send
RTS
3
CS
TX
14
TXD
Transmit data
Not connected
NC
4
SCK
RX
13
RXD
Receive data
Not connected
NC
5
MISO
SCL
12
NC
Not connected
Not connected
NC
6
MOSI
SDA
11
NC
Not connected
7
3.3V
5V
10
+5V
Power supply
8
GND
GND
9
GND
Ground
Power supply +3.3V
Ground
GND
Maximum ratings
Description
Min
Typ
Max Unit
Supply Voltage 3.4
4.4
V
+85
°C
Normal operation: ‐40
1.8V, 3V
Support SIM card:
I[VBAT]
2
A
Programming
Code examples for GSM/GNSS 2 click, written for MikroElektronika hardware and compilers
are available on Libstock.
Code snippet
This code snippet initializes the MCU and the module. It first sends an initial message to the user
and then logs an events such as calls or messages on the microSD card and reads the current GPS
location, all in an infinite loop.
01 void main( void )
02 {
03
system_init();
04
at_init( rsp_handler, UART1_Write, buffer, sizeof( buffer ) );
05
at_cmd_save( "+CMS ERROR", 1000, NULL, NULL, NULL,
at_cb_send_init_message );
06
at_cmd_save( "+FSMEM", 3000, NULL, NULL, NULL, at_cb_microsd_end );
07
at_cmd_save( "+CMT", 3000, NULL, NULL, NULL, sms_action_handler );
08
at_cmd_save( "+CMGS", 1000, NULL, NULL, NULL, at_cb_send_init_message
);
09
10
gsm_gnss_2_power_on();
11
12
gsm_gnss_2_init();
13
14
send_SMS();
// Sending initial message
15
16
while( !msg_sent ) at_process();
// Waiting for SMS sending
status
17
18
LOG( "rn**********************************************************rn"
);
19
LOG( "Finished Sending SMS Message.");
20
LOG( "rn**********************************************************rn"
);
21
22
micro_SD();
// Creating files on microSD
23
24
while( !sd_f ) at_process();
// Waiting for SD card
operations
25
26
LOG( "rn**********************************************************rn"
);
27
LOG( "Finished SD Initialization.");
28
LOG( "rn**********************************************************rn"
);
29
Delay_ms( 1000 );
30
31
LOG( "rn**********************************************************rn"
);
32
LOG( "Waiting for the Message or Call in an Infinite Loop");
33
LOG( "rn**********************************************************rn"
);
34
35
////////////////////////////////////////////////////////////////////////////
36
while( true )
37
{
38
at_process();
39
40
if ( action_f )
// Message received or call
ended
41
{
42
update_log();
43
action_f = false;
44
}
45
}
46
////////////////////////////////////////////////////////////////////////////
47 }
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