#include <U8g2lib.h>
#include "u8g2_font_shnufont.h"
#include "pitches.h"
#include "song.h"

int tonepin = 5;

U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ A5, /* data=*/ A4, /* reset=*/ U8X8_PIN_NONE);   // All Boards without Reset of the Display

void setup(void) {
  u8g2.begin();
  u8g2.enableUTF8Print();		// enable UTF8 support for the Arduino print() function
  pinMode(6, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
  u8g2.setFont(u8g2_font_shnufont);
  u8g2.setFontDirection(0);
}

void loop(void) {

  u8g2.clearBuffer();
  if (analogRead(A3)<300)
  {
    u8g2.setCursor(0, 15);
    u8g2.print("绿灯");
    u8g2.sendBuffer();
    noTone(tonepin);
  }
  else {
    u8g2.setCursor(0, 40);
    u8g2.print("红灯禁止通行");
    u8g2.sendBuffer();
    playSong(melody_motherland, duration_motherland, sizeof(melody_motherland) / sizeof(melody_motherland[0]));
  }

  delay(1000);
}

void playSong(int melody[], float duration[], int length)
{
  for (int thisNote = 0; thisNote < length; thisNote++) {
    int noteDuration = 250 * duration[thisNote];
    tone(tonepin, melody[thisNote], noteDuration);
    // to distinguish the notes, set a minimum time between them.
    // the note's duration + 30% seems to work well:
    int pauseBetweenNotes = noteDuration * 1.00;
    delay(pauseBetweenNotes);
    // stop the tone playing:
    //noTone(tonepin);
  }
 
}