connection of dtmf decoder and arduino uno

Projects General Guidance
1

hi
i have dtmf decoder(cs9370gdp). In the manual it is given to connect q1,q2,q3,q4 to some 3,4,5,6 pins.. is that connection fixed or we can change it...? i have tried by changing the pins but i am not able to get the same output. actually i need four pwm signal pin as they mentioned in their manual it is connected to 3 pwm signals and 1 digital pin so we have only 3 left... please help.

2

But I saw this code using pin 16,17,18,&19, it say can be connected to any four digital pins.

const int StD=0;           // Can be connected to Interrupt 0/1 (i.e. D2/D3)
const int Q[4]={
  16,17,18,19};            // Can be connected to any four digital pins
int key;

void setup()
{
  Serial.begin(9600);
  attachInterrupt(StD,dtmf,RISING);  // attach the interrupt to be activated at the Rising edge of the StD pulse
  for(int i=0;i<4;i++)
    pinMode(Q[i],INPUT);             // define the data pins Q1-Q4 as input pins 
}

void loop()
{
}

void dtmf()
{
  key=0;
  for(int i=0;i<4;i++)
    key+=digitalRead(Q[i])<<i;        // Read the data pins digitally and convert it into a decimal number 
  Serial.println(key);
}

DTMF Decoder board.pdf (429 KB)

3

Hey,guys...am new here...still learning the ropes...
i have a dtmf decoder and i'd like help on how to connect it to the 2phones and arduino then see it function...information plus schematics will be well appreciated.ThankYou.

4

You won't get anywhere until you specify the decoder chip or assembly so that either you have a datasheet, or we can find it for you.

5

I have the DTMF decoder MT8870.
can I get help with that?

6

Hey,guys...
i have a dtmf decoder MT8870 and i'd like help on how
to connect it to the 2phones and arduino then
see it function...information plus schematics
will be well appreciated.ThankYou.

7

924355:
Hey,guys...
i have a dtmf decoder MT8870 and i'd like help on how
to connect it to the 2phones and arduino then
see it function...information plus schematics
will be well appreciated.ThankYou.

Hooking a 8870 to an arduino is pretty simple, just 4 data input pins and one dataready input pin. However your desire to "connect it to the 2 phones" is not clear at all. What are the objectives of the project?

8

I want to use it to control a quadcopter/Rover:) ..but thats later on,I want to see it in action so that I know how to implement this function to the project or anyother whatsover... I want to be able to call the other phone then see it decode the buttons I press...
I also want to see how I connect the receiving phone to the dtmf decoder or arduino..am pretty new at this,:slight_smile: diagrams/schematics will be pretty helpful.