ERROR:SIM900 doesn't answerCheck power and serial pins in GSM.cpp on GSM shield

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1

ERROR: SIM900 doesn't answer. Check power and serial pins in GSM.cpp

Iam getting this error

This is the board iam using

480×640 41.1 KB

This is the code iam using

#include "SIM900.h"
#include <SoftwareSerial.h>
#include "call.h"
#include <DHT.h>
#include "sms.h"

SMSGSM sms;
#define DHTPIN 7
#define DHTTYPE DHT11

CallGSM call;
boolean started=false;
char sms_text[160];

DHT dht(DHTPIN, DHTTYPE);

void setup()
{
dht.begin();
Serial.begin(9600);

if (gsm.begin(9600))
{
Serial.println("\nstatus=READY");
started=true;
}
else
Serial.println("\nstatus=IDLE");
}

void loop()
{
float humidity, temperature;
String smsText ="";

switch (call.CallStatus())
{
case CALL_NONE: // Nothing is happening

break;

case CALL_INCOM_VOICE : // Yes! Someone is calling us

Serial.println("RECEIVING CALL");
call.HangUp();
delay(2000);
humidity = dht.readHumidity();
temperature = dht.readTemperature();
delay(2000);
smsText = "Temperature: "+String(temperature,1)+"C Humidity: "+String(humidity,1)+"%";
smsText.toCharArray(sms_text,160);
//Serial.println(smsText);
sms.SendSMS("+91mynumber",sms_text);
break;

case CALL_COMM_LINE_BUSY: // In this case the call would be established

Serial.println("TALKING. Line busy.");

break;
}
delay(1000);
}

This is the code iam using

//De-comment this two lines below if you have the
//second version og GSM GPRS Shield
#define GSM_TXPIN 2
#define GSM_RXPIN 3

Above is the code from GSM.cpp file

i think iam making some error

iam not connecting the tx and rx connector pins correctly i think any input.

iam new to this adruidno

here the video of what iam trying to make it.

2

Your diagram suggests that you are using D0 & D1 to communicate with the SIM900A shield. If that is so then you cannot use Serial as it uses D0 & D1 to communicate too.

In future please use code tags around your code, not quote tags.