Radio FM cu TEA5767 si... Arduino

   Modulul de radio FM, echipat cu TEA5767 se gaseste la un pret f. bun pe ebay si poate fi controlat de un microcontroler...
   O prezentare foarte detaliata se gaseste in fisa de catalog (datasheet) si in materialul producatorului, AN10133 - Low voltage FM stereo radio with TEA5767/68
   Sunt cateva articole bune, care trateaza acest modul:
- TEA5767 (+ ATmega8) FM radio de pe site-ul http://tomeko.net/
- Making an FM radio-Part 1; the TEA5767 de pe http://ssihla.wordpress.com/ 

- TEA5767 FM Radio Breakout Board for Arduino de la doctormonk.com

- A two dollar programmable FM radio

- Arduino FM receiver with TEA5767 de la electronicsblog.net (unde este detaliat si explicat un cod/sketch)

   Fara a avea modulul radio conectat, am compilat codul de pe site si am gasit erori, in sensul ca s-au schimbat instructiunile din Wire.send in Wire.write... 

asa ca am inlocuit termenii, iar noul sketch ar trebui sa arate asa:

/// Arduino FM receiver with TEA5767 http://www.electronicsblog.net

#include <Wire.h>

#include <LiquidCrystal.h>

unsigned char search_mode=0;

int b=0;

int c=0;

#define Button_next 30

#define Button_prev 31

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--;

  ////////////////////

}

   PS: in articol este folosit un Arduino Mega, asa ca pinii de inainte si inapoi trebuie redefiniti...

   Am realizat si eu o varianta de montaj, cu o mufa pentru jack stereo:

27.06.2013

   Primul pas, dupa conectare la o placa Arduino, a fost sa vad ce adresa de comunicare are pe i2c si aceasta este, ca in documentatia Philips/NXP, 0x60:

   Am folosit metoda descrisa in articolul Interfata i2c la LCD pentru Arduino (i2c scanner).

   Am conectat si afisajul cu cristale lichide pe 16 coloane a 2 randuri cu interfata i2c si am regasit adresa 0x20:

   Dupa mici modificari ale sketch-ului dinainte pentru Arduino Uno in loc de Arduino Mega si folosirea unui afisaj LCD16x2 cu interfata i2c in locul celei clasice (paralele) am obtinut:

// Arduino FM receiver with TEA5767 http://www.electronicsblog.net

// using LCD16x2 with i2c interface, http://nicuflorica.blogspot.ro

// adapted skech by niq_ro 

// version 1.1

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x20,16,2); // adress is 0x20 for LCD16x2

unsigned char search_mode=0;

int b=0;

int c=0;

#define Button_next 11

#define Button_prev 12

unsigned char frequencyH=0;

unsigned char frequencyL=0;

unsigned int frequencyB;

double frequency=0;

double freq_available=0; 

void setup()   { 

  Wire.begin();

  lcd.init(); 

  lcd.backlight(); //backlight is now ON

  // set up the LCD's number of columns and rows: 

  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=104.5; //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=5;

    delay(10);

  };

  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=50;

  };    

  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=5;

    delay(10);

  };

  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=10;

  };          

  if (!c==0) c--;

  ////////////////////

}

   Deoarece nu am fost multumit de modul de scanare (nu reactioneaza cum trebuie la apasarea tastelor), am cautat pe net si am descoperit chiar o librarie TEA5767 cu exemplu, care mai necesita o librarie Button.
   Am modificat un pic exemplul pentru afisajul meu cu interfata i2c si am obtinut:

   Mai e "de lucrat" la exemplu asta deoarece nu are decat scanare inainte si inapoi, fara a opri sunetul in perioada cautarii (activare functie MUTE), dar ca exemplu de urmat e ok:

#include <TEA5767.h>

// from https://github.com/andykarpov/TEA5767

#include <Wire.h>

#include <Button.h>

// from http://arduino-info.wikispaces.com/HAL-LibrariesUpdates

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x20,16,2); // adress is 0x20 for LCD16x2

// adapted sketch by niq_ro from http://nicuflorica.blogspot.ro

// version 2.0

TEA5767 Radio;

double old_frequency;

double frequency;

int search_mode = 0;

int search_direction;

unsigned long last_pressed;

Button btn_forward(11, PULLUP);

Button btn_backward(12, PULLUP);

void setup() {  

  Wire.begin();

  Radio.init();

  Radio.set_frequency(104.5); 

  Serial.begin(9600);

  lcd.init();

  lcd.backlight(); //backlight is now ON

  lcd.begin(16,2);

  lcd.clear();

}

void loop() {

  unsigned char buf[5];

  int stereo;

  int signal_level;

  double current_freq;

  unsigned long current_millis = millis();

  

  if (Radio.read_status(buf) == 1) {

    current_freq =  floor (Radio.frequency_available (buf) / 100000 + .5) / 10;

    stereo = Radio.stereo(buf);

    signal_level = Radio.signal_level(buf);

    lcd.setCursor(0,0);

    lcd.print("FM: "); lcd.print(current_freq);

    lcd.print("MHz ");

    lcd.setCursor(0,1);

    if (stereo) lcd.print("STEREO "); else lcd.print("MONO ");

    lcd.print(signal_level);

    lcd.print("/15 ");

  }

  

  if (search_mode == 1) {

      if (Radio.process_search (buf, search_direction) == 1) {

          search_mode = 0;

      }

  }

  

  if (btn_forward.isPressed()) {

    last_pressed = current_millis;

    search_mode = 1;

    search_direction = TEA5767_SEARCH_DIR_UP;

    Radio.search_up(buf);

    delay(500);

  }

  

  if (btn_backward.isPressed()) {

    last_pressed = current_millis;

    search_mode = 1;

    search_direction = TEA5767_SEARCH_DIR_DOWN;

    Radio.search_down(buf);

    delay(500);

  } 

   delay(100);

}

   Am facut si un filmulet, numit FM radio FM with TEA5767 and Arduino:

   Am conectat si afisajul de tip Nokia 5110:

   Sketch-ul fiind:

/*********************************************************************

This is an example sketch for our Monochrome Nokia 5110 LCD Displays

  Pick one up today in the adafruit shop!

  ------> http://www.adafruit.com/products/338

These displays use SPI to communicate, 4 or 5 pins are required to

interface

Adafruit invests time and resources providing this open source code,

please support Adafruit and open-source hardware by purchasing

products from Adafruit!

Written by Limor Fried/Ladyada  for Adafruit Industries.

BSD license, check license.txt for more information

All text above, and the splash screen must be included in any redistribution

*********************************************************************/

// Nokia 5110 LCD (PCD8544) from https://code.google.com/p/pcd8544/

/* niq_ro ( http://nicuflorica.blogspot.ro ) case for Nokia 5110 LCD (PCD8544) - LPH 7366:

 For module from China, you must connect like this:

* Pin 1 (RST) -> Arduino digital 6 (D6)

* Pin 2 (CE) -> Arduino digital 7 (D7)

* Pin 3 (DC) -> Arduino digital 5 (D5)

* Pin 4 (DIN) -> Arduino digital 4 (D4)

* Pin 5 (CLK) - Arduino digital 3 (D3)

* Pin 6 (Vcc) -> +5V thru adaptor module (see http://nicuflorica.blogspot.ro/2013/06/afisajul-folosit-la-telefoanele-nokia.html )

* Pin 7 (LIGHT) -> +5V thru 56-100 ohms resistor (for permanent lights) or... other pin control

* Pin 8 (GND) -> GND1 or GND2 

*/

// adapted sketch by niq_ro from http://nicuflorica.blogspot.ro

// version 3.0

#include <Adafruit_GFX.h>

#include <Adafruit_PCD8544.h>

// Adafruit_PCD8544 display = Adafruit_PCD8544(SCLK, DIN, DC, CS, RST);

Adafruit_PCD8544 display = Adafruit_PCD8544(3, 4, 5, 7, 6);

#include <TEA5767.h>

// from https://github.com/andykarpov/TEA5767

#include <Wire.h>

#include <Button.h>

// from http://arduino-info.wikispaces.com/file/view/Button.zip/405390486/Button.zip

// TEA5767 begin

TEA5767 Radio;

double old_frequency;

double frequency;

int search_mode = 0;

int search_direction;

unsigned long last_pressed;

Button btn_forward(11, PULLUP);

Button btn_backward(12, PULLUP);

// TEA5767 end

void setup () {

  Wire.begin();

  Radio.init();

  Radio.set_frequency(104.5); 

  Serial.begin(9600);

  display.begin();

  // init done

  // you can change the contrast around to adapt the display

  // for the best viewing!

  display.setContrast(100);

  display.clearDisplay();

  // Print a logo message to the LCD.

  display.setTextSize(1);

  display.setTextColor(BLACK);

  display.setCursor(0,0);

  display.println("tehnic.go.ro");

  display.setCursor(24, 8);

  display.print("& niq_ro");

  display.setCursor(1, 24);

  display.print("radio FM");  

  display.setCursor(0, 32);

  display.print("cu TEA5767");

  display.setCursor(0, 40);

  display.print("versiunea ");

  display.setTextColor(WHITE, BLACK);

  display.print("3.0");

  display.display();

  delay (5000);

  display.clearDisplay(); 

}

void loop () {

  unsigned char buf[5];

  int stereo;

  int signal_level;

  double current_freq;

  unsigned long current_millis = millis();

  

  if (Radio.read_status(buf) == 1) {

    current_freq =  floor (Radio.frequency_available (buf) / 100000 + .5) / 10;

    stereo = Radio.stereo(buf);

    signal_level = Radio.signal_level(buf);

   display.setTextSize(2);

   display.setTextColor(BLACK);

   display.setCursor(0,0);

   display.print(display.print(current_freq));

   display.setCursor(47,15);

   display.print("MHz");

   display.setCursor(0,20);

   display.setTextSize(1);

   display.setTextColor(BLACK);

   

   if (stereo) display.print("STEREO"); else display.print("MONO");

   // display level of FM signal..

   display.setCursor(0,35);

   display.setTextSize(1);

   display.setTextColor(WHITE, BLACK);

   display.print(signal_level);

   display.print("/15 ");

   

   display.display();

   delay (500);

display.clearDisplay(); 

// draw a signal level triangle...

   display.drawLine(80, 30, 80, 45, BLACK);

   display.drawLine(80, 45, 50, 45, BLACK);

   display.drawLine(50, 45, 80, 30, BLACK);

int sl = signal_level;

   for (int x = 0; x < sl; x++)

   { 

   display.drawLine(50+2*x, 45, 50+2*x, 45-x, BLACK);

   }

  }

  

  if (search_mode == 1) {

      if (Radio.process_search (buf, search_direction) == 1) {

          search_mode = 0;

      }

  }

  

  if (btn_forward.isPressed()) {

    last_pressed = current_millis;

    search_mode = 1;

    search_direction = TEA5767_SEARCH_DIR_UP;

    Radio.search_up(buf);

    delay(1000);

  }

    

  if (btn_backward.isPressed()) {

    last_pressed = current_millis;

    search_mode = 1;

    search_direction = TEA5767_SEARCH_DIR_DOWN;

    Radio.search_down(buf);

    delay(1000);

  } 

   delay(100);

}

   Filmul cu acest afisaj se numeste FM radio with TEA5767 and Arduino (II):