Testing RTC and FM all at once

rtc-fm.ino

#include <Wire.h>
#include "RTClib.h"
#include <TEA5767N.h>

TEA5767N radio = TEA5767N();
RTC_DS3231 rtc;


//Variables:
int signal_level;
double current_freq;
int inByte;
int flag = 0;
String frq;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

void setup () {
  //Sets the radio station
  radio.selectFrequency(104.2);
  Serial.begin(115200);



  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if (rtc.lostPower()) {
    Serial.println("RTC lost power, lets set the time!");
    // following line sets the RTC to the date & time this sketch was compiled
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
  }
}

void loop () {
  byte isBandLimitReached = 0;


  if (Serial.available() > 0) {
    char firstChar =  Serial.read();
    inByte = firstChar;
    if (inByte == '+' || inByte == '-') { //accept only + and - from keyboard
      flag = 0;
    } else {
      frq = Serial.readString();
      frq = firstChar + frq;
      Serial.println(frq);
      float f1 =  atof(frq.c_str());
      if (f1 <= 108  && f1 >= 88) {
        radio.selectFrequency(f1);
        flag = 0;
      }
    }
  }

  //If forward button is pressed, go up to next station
  if (inByte == '+') {

    radio.setSearchUp();
    isBandLimitReached = radio.searchNextMuting();
    if (radio.readFrequencyInMHz() >= 108) {
      Serial.println("Reached to the End, Let me scan from the Start");
      radio.selectFrequency(88.0);
      radio.setSearchUp();
      isBandLimitReached = radio.searchNextMuting();

    }
  }
  //If backward button is pressed, go down to next station
  if (inByte == '-') {
    radio.setSearchDown();
    isBandLimitReached = radio.searchNextMuting();
    if (radio.readFrequencyInMHz() <= 88) {
      Serial.println("Reached to the Start ,Let me scan from the End");
      radio.selectFrequency(108.0);
      radio.setSearchDown();
      isBandLimitReached = radio.searchNextMuting();

    }
  }



  if (flag == 0) {
    current_freq =  radio.readFrequencyInMHz();
    signal_level = radio.getSignalLevel();
    Serial.print("Current freq: ");
    Serial.print(current_freq);
    Serial.print("MHz( ");

    Serial.print(radio.isStereo() ? "Stereo" : "Mono");
    Serial.println(")");
    Serial.print("Signal Strength : ");
    Serial.print(signal_level);
    Serial.println("/15");


    DateTime now = rtc.now();

    Serial.print(now.year(), DEC);
    Serial.print('/');
    Serial.print(now.month(), DEC);
    Serial.print('/');
    Serial.print(now.day(), DEC);
    Serial.print(" (");
    Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
    Serial.print(") ");
    Serial.print(now.hour(), DEC);
    Serial.print(':');
    Serial.print(now.minute(), DEC);
    Serial.print(':');
    Serial.print(now.second(), DEC);
    Serial.println();

    Serial.println();


    flag = 1;
  }




}