ARDUINO FM RADIO

Here is a simple FM radio with Ardiuno  board ,
Which required popular Radio module called  RDA5807M.

The RDA5807M series support frequency range is from 50MHz to 115MHz.

Easily available in the market

i simply find this module in MP3 players available in the market ,

this modules is without 32khz crystal, you need to placed this crystal on the IC 6 pin & to the ground

You must have Libraries like -------Wire.h ----    TEA5767Radio.h   -------    LiquidCrystal.h   

Here in Code TEA5767Radio were used , it will support RDA5807M Chip.

Also remember these two pins must be proper

  * Arduino Pin A5  =  Radio Chip Pin SDA  
 * Arduino Pin A4   =  Radio Chip Pin SCL   

1 ----> Arduino SDA
2 ----> Arduino SCL
3 ----> GND
5 ----> +5V
6 ----> GND
7 ----> Audio out (right channel)
8 ----> Audio out (left channel)
10 ---> Antenna

 * LCD RS pin to digital pin 12
 * LCD Enable pin to digital pin 11
 * LCD D4 pin to digital pin 5
 * LCD D5 pin to digital pin 4
 * LCD D6 pin to digital pin 3
 * LCD D7 pin to digital pin 2
 * LCD R/W pin to ground
 * Arduino SDA PIN A5
 * Arduino SCL PIN A4
 * ends to +5V and ground
 * UP SEARCH (A0)
 * DOWN SEARCH (A1)
-----------------------------------------------------------------
#include <Wire.h>                             
#include <TEA5767Radio.h>                     
#include <LiquidCrystal.h>                   
                                             
                                             
TEA5767Radio radio = TEA5767Radio();         
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);           
float frequency = 0;                         
int fUP = A0;                                 
int fDOWN = A1;                             
int count = 0;                                 


void setup()
{
  delay(1000);
  Wire.begin();
  frequency = 96.0;                       //starting frequency

  radio.setFrequency(frequency);
  lcd.begin(16,2);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("FM: ");
  lcd.setCursor(0, 1);
  lcd.print(frequency);

}

void loop()
{

  if(digitalRead(fUP))                   
  {
    count=0;
    while (digitalRead(fUP))
    {
      count++;
      if(count > 0 && count <= 6)       
      {
        frequency += 0.1;
        frequencyUpdate();
        delay(200);
      }
      else if (count > 6 && count <= 2) 
      {
        frequency += 0.1;
        frequencyUpdate();
        delay(80);
      }
      else                             
      {
        frequency += 0.1;
        frequencyUpdate();
        delay(5);
      }
    }

  }



   if(digitalRead(fDOWN))                 
   {
     count = 0;
    while (digitalRead(fDOWN))         
    {
      count--;
      if(count < 0 && count >= -6)
      {
        frequency -= 0.1;
        frequencyUpdate();
        delay(200);
      }
      else if (count < -6 && count >= -12)
      {
        frequency -= 0.1;
        frequencyUpdate();
        delay(80);
      }
      else                               
      {
        frequency -= 0.1;
        frequencyUpdate();
        delay(5);
      }
    }
   }

}


void frequencyUpdate()                    //this function changes the frequency of the station, is called by preset and frequency up/down conditions.
{
  frequency = constrain(frequency, 50.0, 115.0);     //50MHz to 115MHz.
  lcd.setCursor(0,0);
  lcd.print("KSF FM:");
  lcd.setCursor(0,1);
  lcd.print(frequency);
  radio.setFrequency(frequency);
}