The GSM/GPRS expansion board is used SIM900 4 frequency GSM/GPRS module.GSM/GPRS function extension for main control board.And after the extension board can be short of breath transceiver, and GPRS communication data connection.

Pin:

1. The extension board have switch can choose SIM900 serial or SIM900 debug port connection, if choose the debug port, must be practical hardware serial port to control, simulate the serial port is invalid.Board provides farah capacitance of the RTC power supply module.

2. The Debug toggle switch, you can set the SIM900 Debug port connected to or through ATMEGA8U2 / FT232 connected to the PC, the Debug debugging

3. 3.3 V and 5 V compatible automatic level, can be adaptive to 3.3 V or 5 V of the main control board, support the leaf maple and Chipkit such other platform development board of 3.3 V

The principle diagram of the product and manual download:httttp://pan.baidu.com/s/1eQGezWu(copied to the browser)

Today, teach you to use sim900 extension board make household burglar alarm, detected by human activities is to call the specified number.(you can also join MQ2 sensors, such as smoke, gas leak detection alarm function, we can see the tutorial:httttp://item.taobao.com/item.htm?SPM = 686.1000925.1000774.31 sEYPHe&id = 15366746049)

Today's tutorial needed parts are:

3 pin dupont line and high line is not necessary, you can use the pin 1 dupont line instead.9 v / 2 a power adapter must be, because the ICOMSAT work the peak current is 2 a, such as make a phone call, if the power supply is insufficient will lose power.Antenna and the extension cord is with ICOMSAT matching, buy a send.Sim card is only supported unicom mobile Sim card, or does not support DianXinKa.

Because we want to use to sim900 serial port, so don't put the overlay and ICOMSAT before burning program, otherwise the burning process in uno.UNO driver installation is described here:httttp://item.taobao.com/item.htm?Id = 12614383503Jump on cap and other parameters, please refer to ICOMSAT manual, schematic diagram and libraries.

Although now we just do simple tutorial, do not need to use the library, but we still provide the library files, so that friends can develop more cow force of the work.I'm looking forward to oh ~

Nonsense not much said, here are the tutorial to use the code:

Int PIR = 2;/ / the human body infrared sensor D2 from uno

Int val = 0;

void setup()

{

PinMode (PIR, INPUT);

PinMode (9, the OUTPUT);/ / D9 is sim900 power control

DigitalWrite (9, HIGH);

Delay (1000);

DigitalWrite (9, LOW);

Delay (10000);

Delay (5000);

Serial. The begin (9600);

}

void loop()

{

Val = digitalRead (PIR);

If (val = = LOW)

{

Serial. Print ("" ATD12345678900;"");/ / 12345678900 to dial the telephone number you want

Delay (5000);

While (!DigitalRead (PIR));

}

The else

{

Serial. Print ("" NO "");

Delay (1000);

}

}

The next assembly hardware, use 3 pin dupont line, to link the human body infrared sensor to the D2, insert high mother, as shown in figure:

Insert sim card (confirm rich, has not expired), connected to the antenna, ICOMSAT on the stack.The diagram below:

Pay attention to jump caps are so jump.The diagram below:

If it is to use the pin 1 dupont line, but it will effect the diagram below:

Hardware have assembled in this way, because of using the program automatically boot, so after electricity sim900 module began to start, sensors are also beginning to work.Before use, be sure to put the human body infrared sensor, because from the theory of relativity, itself can determine if it's a move to detect movement.