Hi
I am trying to read the response from the AT Command to check my airtime balance. I am getting the correct message from the AT command but I cant seem to get it to print over serial. The serial print command is just printing the AT command that was sent.
Here is my results that I get. It should print Balance is = +CUSD: 0,"Balance: R 0.00 .SMS: 12.",64
Instead its printing
Balancec is = AT+CUSD=1,"*101#"
I have tried different methods but all with the same results. This is my first time in 6 years trying to program again so please be gentle 
+CMT: "+27XXXXXXXXX","","19/02/24,14:41:00+08"
Balance
Balancec is = AT+CUSD=1,"*101#"
OK
+CUSD: 0,"Balance: R 0.00 .SMS: 12.",64 <--- I want to read this part
TEMPRATURE = 32C
Light Must Switch OFF
TEMPRATURE = 32C
here is my code: (I had to remove a lot to get it to post)
#include "DHT.h"
#include <Adafruit_Sensor.h>
#include <SoftwareSerial.h>
#include <EEPROM.h>
//*************************************************************
#define DHTPIN 2//DHT sensor attached to digital pin 2 of Arduino Uno
// Uncomment whatever type of sensor you're using
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT22 // DHT 22 (AM2302)
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
// Initialize DHT sensor for normal 16mhz Arduino
//***************************LM35****************************
int val;
int tempPin = 1;
//**********************************************************
DHT dht(DHTPIN, DHTTYPE);
SoftwareSerial SIM900module(7, 8);//software serial port
// Create global varibales to store temperature and humidity
int t; // temperature in celcius
int f; // temperature in fahrenheit
int h; // humidity
char incomingChar;//variable to store incoming SMS characters
String Num; //Variable to store incoming phone number
String txtmsg; //Store entire string message
String t2;
String St = "+27846035086";
String Na = "+2772595723";
String W; // Week number
String TT; // AT command error test variable
String balance; // return ussd message
int Weeknum = 0;
int Status = 0;
int Week = 0;
int Balance = 0;
int Lights = 5;
int Fan = 4;
int Tmin; // Minimum temp
int Tmax; // Maximum temp
int Hmin; // Humidity min var
int Hmax; // Humidity max var
//**************************************************************
void setup() {
dht.begin();
Serial.begin(19200);
Serial.read();
delay(1000);
SIM900module.begin(19200);
delay(100);
powerUpOrDown();
// Give time to your GSM shield log on to network
delay(10000);
Serial.println("SIM900 module ready...");
// AT command to set SIM900 to SMS mode
SIM900module.print("AT+CMGF=1\r");
delay(100);
// Set module to send SMS data to serial out upon receipt
SIM900module.print("AT+CNMI=2,2,0,0,0\r");
delay(100);
pinMode(Lights, OUTPUT);
pinMode (Fan , OUTPUT);
W = EEPROM.read(0);
Week = EEPROM.read(0);
Tmin = EEPROM.read(1);
Tmax = EEPROM.read(2);
Hmin = EEPROM.read(2);
Hmax = EEPROM.read(4);
}
//*****************************************************Power ON/OFF**********************************
void powerUpOrDown()
{
SIM900module.print("AT\r");
delay(1000);
String serIn = SIM900module.readString();
Serial.print(serIn);
if(serIn.indexOf("OK") >=0) //test if OK was found in AT command response (is modem on or off)
{
return;
}
delay(100);
pinMode(9, OUTPUT);
digitalWrite(9,LOW);
delay(1000);
digitalWrite(9,HIGH);
delay(2000);
digitalWrite(9,LOW);
delay(3000);
}
//**********************************************************************Main Loop**********************************************************************
void loop() {
if (SMSRequest()) {
if (readData()) {
if(findNum()) {
delay(100);
if (Weeknum > 0) // Sends message for week selection
{
String dataMessage = ("Week: " + String (Weeknum) + " Selected");
SIM900module.print(dataMessage);
delay(100);
}
if (Status > 0) // Reports on sensor data
{
// REPLACE WITH YOUR OWN SMS MESSAGE CONTENT
String dataMessage = ("Week: "+ String(W) + " Temperature: " + String(t2) + "*C ");// + " Humidity: " + String(h) + "%");
// Send the SMS text message
SIM900module.print(dataMessage);
delay(100);
}
if (Balance > 0) // Reports on sensor data
{
// Send the SMS text message
SIM900module.print(String (balance));
delay(100);
}
// End AT command with a ^Z, ASCII code 26
SIM900module.println((char)26);
delay(100);
SIM900module.println();
// Give module time to send SMS
delay(5000);
delSMS();
}
}
}
readData();
temp_reg();
// hum_reg ();
// disp_Time();
}
//*****************************************************************Read data from DHT11 Sensor*****************************************************
if(txtmsg.indexOf("Balance") >=0)
{
Balance=1; // Just a market to see if sms should be sent
SIM900module.println("AT+CUSD=1,\"*101#\"\r"); // AT command for Balance request
delay(5000);
String balance = SIM900module.readStringUntil("64"); // Read string until 64 is found (end of message
Serial.print("Balancec is = ");
Serial.print(balance);
//balance = balance.substring(11,37); this part is for when I can actually get the message
// Serial.print("Balance received is: ");
// Serial.println(balance);
// return true;
}
return false;
}
}
//******************************************************************Find Senders Number***********************************************************
/* void findNum()
{
Num = txtmsg.substring(9,21); // Set global var for cell number to received SMS number
delay(100);
Serial.println(String ("number is")+Num);
if (Num == St) // test if it is first Number
{
Serial.println("Message received from Stephan");
SIM900module.println("AT + CMGS = \"+27846035086\"");
delay(100);
}
else if (Num == Na) // test if it is second number
{
Serial.println("Message received from Nadia");
SIM900module.println("AT + CMGS = \"+27846035086\"");
delay(100);
}
else if (Num !=St && Num !=Na)
{
Serial.println("Number Not recognized");
}
}*/
boolean findNum()
{
if(txtmsg.indexOf("+27846035086") >=0)
{
Serial.println("Received Message: from Stephan");
SIM900module.println("AT + CMGS = \"+27846035086\"");
delay(100);
return true;
}
if(txtmsg.indexOf("+27725957223") >=0)
{
Serial.println("Received Message: from Nadia");
SIM900module.println("AT + CMGS = \"+27725957223\"");
return true;
}
else
{
Serial.println("Number not recognized");
return false;
}
}
//***************************************Delete SMS When done************************************
void delSMS() { // Delete All messages
//mySerial.println( "AT+CMGF=1" ); // Did not help
//delay(1000); //Did not help
SIM900module.print("AT+CMGDA=\"");
SIM900module.println("DEL ALL\"");
delay(500);
Serial.println( "All Messages Deleted" );
}
The part I am struggeling with
if(txtmsg.indexOf("Balance") >=0)
{
Balance=1; // Just a market to see if sms should be sent
SIM900module.println("AT+CUSD=1,\"*101#\"\r"); // AT command for Balance request
delay(5000);
String balance = SIM900module.readStringUntil("64"); // Read string until 64 is found (end of message
Serial.print("Balancec is = ");
Serial.print(balance);
//balance = balance.substring(11,37); this part is for when I can actually get the message
// Serial.print("Balance received is: ");
// Serial.println(balance);
// return true;
}
Please if anyone can tell me what I am doing wrong
Thanks in advance