Go Down

Topic: Arduino Uno + sim900 (Read 1 time) previous topic - next topic


hi i am trying to make a call or send an sms using this combination of uno and sim900

well i am using a IComSat v1.0 sim900 and arduino 1.0 to program
thts the datasheet...

but everytime i try to upload my program to the uno the sim900 stops responding. and then dsnt turn on.

//Serial Relay - Arduino will patch a
//serial link between the computer and the GPRS Shield
//at 19200 bps 8-N-1
//Computer is connected to Hardware UART
//GPRS Shield is connected to the Software UART

#include <SoftwareSerial.h>

SoftwareSerial mySerial(7, 8 );

void setup()
  mySerial.begin(19200);               // the GPRS baud rate   
  Serial.begin(19200);                 // the GPRS baud rate   

void loop()
  if (mySerial.available())
  if (Serial.available())


the program is to allow a connection and then let me use at commands to make calls or send sms but it seems to not work.

if there is a easier program please let me know


Read the part of the data sheet about data consumption.

The board  / chip can draw anywhere between 500 and 2000mA.  Make sure your external supply is capable of providing that much current, since USB won't be able to.
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

Go Up