Introduction: Use TEA5767 FM Module to Create an Arduino Based FM Radio

Picture of Use TEA5767 FM Module to Create an Arduino Based FM Radio

In this project, we show how to use LinkSprite TEA5767 FM module to create an Arduono based FM radio.

Step 1: Parts List

Picture of Parts List

We will need the following parts:

    1 x TEA5767 FM Radio Breakout
    1 x Arduino Uno
    1 x Linker Base Shield
    2 x Linker Button
    2 x Linker cable
    several male to female jumper wires

Step 2: Wiring Diagram

Picture of Wiring Diagram

We will first install the Linker base shield on top of Arduino Uno.
    Install one Linker button to GPIO 6, and the other Linker button to GPIO 7.
    Connect TEA 5767 to Arduino Uno in the following way:
        SDA of TEA5767 breakout board to A4 of Arduino.
        SCL of TEA5767 breakout board to A5 of Arduino.
        GND of TEA5767 breakout board to GND of Arduino
        VCC of TEA5767 breakout board to VCC of Arduino.

The following are the interfaces of TEA5767 breakout board and Arduino:

Step 3: Code

The Arduino code is as below:

/// Original from Arduino FM receiver with TEA5767 http://www.electronicsblog.net
// Modified by Jingfeng Liu
//  LinkSprite.com
//
#include <Wire.h>
#include <LiquidCrystal.h>

unsigned char search_mode=0;

int b=0;
int c=0;

#define Button_next 6
#define Button_prev 7

unsigned char frequencyH=0;
unsigned char frequencyL=0;

unsigned int frequencyB;
double frequency=0;

double freq_available=0;

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup()   {

  Wire.begin();
  lcd.begin(16, 2);

  /// buttons

  pinMode(Button_next, INPUT);
  digitalWrite(Button_next, HIGH); //pull up resistor

  pinMode(Button_prev, INPUT);
  digitalWrite(Button_prev, HIGH); //pull up resistor

  frequency=87.5; //starting frequency

  frequencyB=4*(frequency*1000000+225000)/32768; //calculating PLL word

  frequencyH=frequencyB>>8;

  frequencyL=frequencyB&0XFF;

  delay(100);

  Wire.beginTransmission(0x60);   //writing TEA5767

  Wire.write(frequencyH);
  Wire.write(frequencyL);
  Wire.write(0xB0);
  Wire.write(0x10);
  Wire.write(0x00);
  Wire.endTransmission();

  delay(100);

}

void loop()
{

  unsigned char buffer[5];

  lcd.setCursor(0, 0);

  Wire.requestFrom(0x60,5); //reading TEA5767

  if (Wire.available())

  {
    for (int i=0; i<5; i++) {

      buffer[i]= Wire.read();
    }

    freq_available=(((buffer[0]&0x3F)<<8)+buffer[1])*32768/4-225000;

    lcd.print("FM ");

    lcd.print((freq_available/1000000));

    frequencyH=((buffer[0]&0x3F));

    frequencyL=buffer[1];

    if (search_mode) {

      if(buffer[0]&0x80) search_mode=0;

    }

    if (search_mode==1) lcd.print(" SCAN");
    else {
      lcd.print("       ");
    }

    lcd.setCursor(0, 1);

    lcd.print("Level: ");
    lcd.print((buffer[3]>>4));
    lcd.print("/16 ");

    if (buffer[2]&0x80) lcd.print("STEREO   ");
    else lcd.print("MONO   ");

  }

  ///// buttons read

  //////////// button_next//////////
  if (!digitalRead(Button_next)&&!b) {

    frequency=(freq_available/1000000)+0.05;

    frequencyB=4*(frequency*1000000+225000)/32768+1;

    frequencyH=frequencyB>>8;
    frequencyL=frequencyB&0XFF; 

    Wire.beginTransmission(0x60); 

    Wire.write(frequencyH);
    Wire.write(frequencyL);
    Wire.write(0xB0);
    Wire.write(0x1F);
    Wire.write(0x00);

    Wire.endTransmission();

    //////////////////////

    b=100;

  };

  if (!digitalRead(Button_next)&&b==1) {

    ///scannnn UP

    search_mode=1;

    Wire.beginTransmission(0x60); 

    Wire.write(frequencyH+0x40);
    Wire.write(frequencyL);
    Wire.write(0xD0);
    Wire.write(0x1F);
    Wire.write(0x00);

    Wire.endTransmission();

    /////////////////

    b=100;

  };  

  if (!b==0) b--;

  //////////// button_prev//////////
  if (!digitalRead(Button_prev)&&!c) {

    frequency=(freq_available/1000000)-0.05;

    frequencyB=4*(frequency*1000000+225000)/32768+1;

    frequencyH=frequencyB>>8;
    frequencyL=frequencyB&0XFF;

    Wire.beginTransmission(0x60); 

    Wire.write(frequencyH);
    Wire.write(frequencyL);
    Wire.write(0xB0);
    Wire.write(0x1F);
    Wire.write(0x00);

    Wire.endTransmission();

    c=100;

  };

  if (!digitalRead(Button_prev)&&c==1) {

    ///scannnn DOWN

    search_mode=1;

    Wire.beginTransmission(0x60); 

    Wire.write(frequencyH+0x40);
    Wire.write(frequencyL);

    Wire.write(0x50);
    Wire.write(0x1F);
    Wire.write(0x00);
    Wire.endTransmission(); 

    c=100;

  };        

  if (!c==0) c--;

  ////////////////////

}


After we download the code to Arduino, we can press the two buttons to scan up and scan down the channels to search for stations.

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