Hi I am trying to use sim900 shield with my arduino. The first and main problem i am facing is that it is not coumunicating with my ardiuno. i tried Arduino uno mega due none of them are working same problem exits with each ardiuno. i tried software serial on mega and hardware serial on due still the same problem ardiuno is not coumunicating even i typed AT i dont get a response "ok" none of them are working i tired many tutorials and example even the simple example is not working mentioned in this link.[https://lastminuteengineers.com/sim900-gsm-shield-arduino-tutorial/]
I used the simple tutorial and the simple code mentioned in this link but its not handshaking
Can any one please help me out with this issue i am so fed up now. GSM shield is power on green light is blinking every 3 second means network is found but when i type AT it does not respond.
I am uploading a picture of my project
@zainraza24, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with your project
Do you have a link (URL) to the shield that you're using?
I am using the softwareserial as i have code for software serial.
include <SoftwareSerial.h>
//Create software serial object to communicate with SIM900
SoftwareSerial mySerial(7, 8); //SIM900 Tx & Rx is connected to Arduino #7 & #8
void setup()
{
//Begin serial communication with Arduino and Arduino IDE (Serial Monitor)
Serial.begin(9600);
//Begin serial communication with Arduino and SIM900
mySerial.begin(9600);
Serial.println("Initializing...");
delay(1000);
mySerial.println("AT"); //Handshaking with SIM900
updateSerial();
mySerial.println("AT+CSQ"); //Signal quality test, value range is 0-31 , 31 is the best
updateSerial();
mySerial.println("AT+CCID"); //Read SIM information to confirm whether the SIM is plugged
updateSerial();
mySerial.println("AT+CREG?"); //Check whether it has registered in the network
updateSerial();
}
void loop()
{
updateSerial();
}
void updateSerial()
{
delay(500);
while (Serial.available())
{
mySerial.write(Serial.read());//Forward what Serial received to Software Serial Port
}
while(mySerial.available())
{
Serial.write(mySerial.read());//Forward what Software Serial received to Serial Port
}
}
Check the power supply spec for the modem…
although i’ve not used the SIM900, I’ve used a few other SIMCOM modems.
They all need up to 2A max, particularly during initial cell discovery*, so that could be your problem.
Otherwise, worth checking that 2G is still available in your region, as the SIM800 is only a 2G modem, and won’t work when the carriers have folded their 2G networks (like here in Australia).
*which can take up to a minute for the first time in busy cells. Typically 10-20 secs under normal startup.
I am supplying 12 volts from a powersupply so it can draw as much current as it needs.
2 g available i can see edge sign on my cell phone i am using same sim card on the modem.and modem is blinking yellow light 1 per 3 seconds it measn it has found the network
can u please tell me about how to configure it to 9600. its no even responding to any thing i type in serial monitor. even for simply typing AT it does not responde me ok. At check the communication between modem and ardiuno. sim comunicatiion will come after. i am stuck at the first command AT.
