Ks0254 keyestudio Sim800c Shield

keyestudio Sim800c Shield

Introduction

This is a GPRS/GSM expansion board for Arduino.
The shield supports the frequency of EGSM 900MHz /DCS 1800MHz and GSM850 MHz /PCS 1900MHz, integrated with GPRS, DTMF and other functions.
It also supports DTMF. When enable the DTMF function, get the character feedback converted from the pressed button during the call, which can be used for remote control.
It is controlled by the AT command, you can directly start the function through the computer serial port and Arduino motherboard.
The SIM800C GPRS shield has a built-in SIM800H chip from SIMCom, with good stability.

Specifications

Power Supply <Vin>: 7-12V
Low power consumption: 0.7mA current in sleep mode
Low battery consumption (100mA @ 7V-GSM mode)
GSM 850/900/1800/1900MHz
GPRS multi-slot class 1 ~ 12
GPRS mobile station class B
GSM phase 2/2 + standard
Class 4 (2W @ 850/900 MHz)
Class 1 (1W @ 1800 / 1900MHz)
Controlling via AT command
USB /Arduino control switch
Serial baud rate self-adaption
Support DTMF
LED indicator for power supply status, network status and operating mode.

Technical Details

Dimensions: 77mm x 52mm x 27mm
Weight: 26g
Antenna length: 180mm

PINOUT

Test Code

Below is an example code.
Click here to download the libraries.
Click here to download the code
Or you can directly copy and paste the code below to Arduino IDE.

#include <sim800cmd.h>
//initialize the library instance
//fundebug is an application callback function,when someone is calling.
Sim800Cmd sim800demo(fundebug);

//the setup routine runs once when you press reset:
void setup()
{
    //initialize the digital pin as an output.
    pinMode(13,OUTPUT);
    //initialize SIM800H,return 1 when initialize success.
    while((sim800demo.sim800init()) == 0);
}

//the loop routine runs over and over again forever:
void loop()
{
  //Signal strength
  unsigned char csq = 0;
  //To obtain the signal strength, return 1 when obtain success.
 if( sim800demo.callReadCSQ(&csq) )
 {
     //Make Voice Call
     sim800demo.dialTelephoneNumber("15912345678;");// enter the phone you need to call
     while(1);
 }
 digitalWrite(13,HIGH);//turn the LED on by making the voltage HIGH
 delay(500);
 digitalWrite(13,LOW);//turn the LED off by making the voltage LOW
 delay(500);
}
 
//application callback function
void fundebug(void)
{
}

Code to Note:
1. Before compile the code, do remember to add the necessary libraries inside the libraries directory of Arduino IDE.
Download the libraries from below link:
https://drive.google.com/open?id=1u9Jrkv3jfkR9pSCzgjZI4CIA0JESgJH3
2. In the code sim800demo.dialTelephoneNumber("15912345678;"), here you can change the phone number you want to dial.

Note: As for arduino IDE 1.0 and subsequent versions, WProgram.h has been renamed Arduino.h, so this program requires arduino IDE 1.0 or later version to compile successfully. In the use of library functions, since the received serial data is too large, so it needs to change the original Arduino serial cache buffer more larger.
There are two methods as below:
1.unzip the hardware.zip, if your Arduino compiler is below 1.5.5 version, cut the HardwareSerial.cpp file into Arduino\hardware\arduino\cores\arduino, overwrite the original file.If it is higher than 1.5.5 version, cut the HardwareSerial.hfile into Arduino\hardware\arduino\sam\cores\ arduino,overwrite the original file.
2.If your Arduino compiler is below 1.5.5 version, open the HardwareSerial.cpp file inside the Arduino\hardware\arduino\cores\arduino, modify the # define SERIAL_BUFFER_SIZE 64 as # define SERIAL_BUFFER_SIZE 140. If it is higher than 1.5.5 version, then open HardwareSerial.h file, doing the same modification.

Example Use

Upload well the code to UNO R3, then stack the shield onto UNO R3. Connect the alligator clip line to both GND and A0-A5 interfaces, and clip the coin to GND and A0 connected to alligator clip line.