Voice Calls questions

Hi to everybody, i want to be able to call a number and speak each other without any problem (just like calling the number from my mobile phone) , the only differance is that i will be staying about 1m-1.5m from the speaker and i should be able to hear normal from the arduino`s speaker.

So i will need:
1.Arduino uno rev3
2.Arduino GSM shield right
right?

my questions are

  1. Can i make a call with a single click of a button? If the answer is yes, is this button built in or i have to do it myself (where i should solder 2 wires of the button)

  2. How big speaker can i solder to the system ? Can i solder something like this


    and also how many Watts can the speaker be?

3.Do i need to have any other board(s) accessoaries or parts to make this work?

Thanks!

Hi,

You can make a call pushing down a button writing a function in your sketch. This function checks button status and, if it pressed, do something like this:

Using this code, you can finish the call by pressing enter in the serial monitor (with new line option selected).

 char remoteNumber[21] = "+12345678910"; // Telephone number
   
  // let the user know you're calling:
  Serial.print("Calling to : ");
  Serial.println(remoteNumber);
  Serial.println();
  
  // Check if the receiving end has picked up the call
  if(vcs.voiceCall(remoteNumber))
  {
    Serial.println("Call Established. Enter line to end");
    // Wait for some input from the line
    while(Serial.read()!='\n' && (vcs.getvoiceCallStatus()==TALKING));          
    // And hang up
    vcs.hangCall();
  }
  Serial.println("Call Finished");

To connect a speaker to the GSM shield, you can read this tutorial to learn how to connect the hardware: http://arduino.cc/en/Guide/ArduinoGSMShield#toc11

Greetings.

Thanks for your reply. But how i will set up exactly wich button to be listened and by pressing it, this function to be executed?
Does this shield has several different buttons pins so i can solder couple of buttons and setup different functions to them?
How can i define in my program/function for example if it was php

function b1()
{
$my_number='00359888888';

if($button1_status=='pressed')
{
lets_call_my_number();
}

if ($button2_status=='pressed')
{
send_sms_to_my_number();
}
}

i hope you can understand my idea, i am not a professional in c or c++ but like in php this gives a simple view of my idea

Thanks

call
}

any examples where to solder a button for voice calling ?

Please i need to do this ->Arduino Makes a Phone Call - YouTube

what is the wiring diagram of the button and also how can i tell to call a given number by pressing the button
any tutorials?

Hello:

You need to use the Arduino to control the button. See here:

but use pin number 2.

Remember that the shield pins are connected to the Arduino pins except pins 2, 3 and 7.

You have to merge both sketches (button example and SMS example). This should run:

// libraries
#include <GSM.h>

#define PINNUMBER ""

// initialize the library instance
GSM gsmAccess; // include a 'true' parameter for debug enabled
GSM_SMS sms;

// constants won't change. They're used here to
// set pin numbers:
const int buttonPin = 6; // the number of the pushbutton pin
const int ledPin = 13; // the number of the LED pin

// variables will change:
int buttonState = 0; // variable for reading the pushbutton status

void setup()
{
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);

// initialize serial communications
Serial.begin(9600);

Serial.println("SMS Messages Sender");

// connection state
boolean notConnected = true;

// Start GSM shield
// If your SIM has PIN, pass it as a parameter of begin() in quotes
while(notConnected)
{
if(gsmAccess.begin(PINNUMBER)==GSM_READY)
notConnected = false;
else
{
Serial.println("Not connected");
delay(1000);
}
}

Serial.println("GSM initialized");
}

void loop()
{

Serial.print("Enter a mobile number: ");
char remoteNumber[20]; // telephone number to send sms
readSerial(remoteNumber);
Serial.println(remoteNumber);

// sms text
Serial.print("Now, enter SMS content: ");
char txtMsg[200];
readSerial(txtMsg);
Serial.println("SENDING");
Serial.println();
Serial.println("Message:");
Serial.println(txtMsg);

// send the message
sms.beginSMS(remoteNumber);
sms.print(txtMsg);
sms.endSMS();
Serial.println("\nCOMPLETE!\n");
}

/*
Read input serial
*/
int readSerial(char result[])
{
int i = 0;
while(1)
{
while (Serial.available() > 0)
{
char inChar = Serial.read();
if (inChar == '\n')
{
result = '\0';

  • Serial.flush();*
  • return 0;*
  • }*
  • if(inChar!='\r')*
  • {*
    _ result = inChar;_
    * i++;*
    * }*
    * }*
    * }*
    }

You have to use the Arduino to control the button.
See this page for button control, but use pin 6 instead of 2.

Remember shield pins are connected to Arduino pins (except 2,3 and 7), so you can connect to the shield +GND, 5V and pin 6.

Now you have to merge both examples: sendSMS and button. This sketch should run, please check it:

// libraries
#include <GSM.h>

#define PINNUMBER ""

// initialize the library instance
GSM gsmAccess; // include a 'true' parameter for debug enabled
GSM_SMS sms;

// constants won't change. They're used here to
// set pin numbers:
const int buttonPin = 6; // the number of the pushbutton pin
const int ledPin = 13; // the number of the LED pin

// variables will change:
int buttonState = 0; // variable for reading the pushbutton status

void setup()
{
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);
// initialize serial communications
Serial.begin(9600);

Serial.println("SMS Messages Sender");

// connection state
boolean notConnected = true;

// Start GSM shield
// If your SIM has PIN, pass it as a parameter of begin() in quotes
while(notConnected)
{
if(gsmAccess.begin(PINNUMBER)==GSM_READY)
notConnected = false;
else
{
Serial.println("Not connected");
delay(1000);
}
}

Serial.println("GSM initialized");
}

void loop()
{

// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);

// check if the pushbutton is pressed.
// if it is, the buttonState is HIGH:
if (buttonState == HIGH) {
// turn LED on:
digitalWrite(ledPin, HIGH);
// send the message
sms.beginSMS("+123456789");
sms.print("Hi!");
sms.endSMS();
Serial.println("\nCOMPLETE!\n");

}
else {
// turn LED off:
digitalWrite(ledPin, LOW);
}
}

thank you, but i just need it to make a voice call instead of sending sms , how i shoud connect 2 pin button to the 3 pin as you said (GND, PIN6, 5V) ??

HI,

I've been working with the GMS shield for a couple weeks now, but i'm at the point in need to set up voice calling. I don't believe i have a software issue, but just a hardware issue. When i establish a call, my speaker is unclear and crackly. I'm just trying to use the speaker and mic setup from the GSM tutorial guide.
In the picture i attached there are two parts circled in red. I assumed they were some zener diode. Can any specify exactly what these are suppose to be? If they are some kind of diode, what rating should it be? also, do i need anything for the "differential layout"? I think these are my problems. Thanks.

GSMShieldMicSpeakerCircuit.png