ESP32 Devkitv1 help

Projects Programming
6 
#include <Tone32.h>
#include <pitches.h>

#define IR_Sensor 18
#define BUZZER_PIN 19
#define BUZZER_CHANNEL 0


int Counter;
int IR;
int frequency;

// the setup function runs once when you press reset or power the board
void setup() 
{
	Serial.begin(115200);
	Serial.println("Setup start");
	pinMode(IR_Sensor, INPUT);
	Serial.println("Setup end");
}

// the loop function runs over and over again until power down or reset
void loop()
{
	if (Counter == 0)
	{
		IR = digitalRead(IR_Sensor);
		if (IR = HIGH)
		{
			Counter++;
			Serial.println(Counter);
			delay(1000);
		}
	}

	if (Counter >= 1);
	{
		Counter++;
		delay(1000);
	}

	if (Counter >= 900)
	{
		Serial.println(Counter);
		Counter = 0;
		delay(500);
	}

	Serial.println(Counter);
	Buzzz();
	Serial.println(frequency);
}

void Buzzz()
{

	if (Counter == 300 && Counter <= 600)
	{
		frequency = 4000;
	}
	if (Counter == 600 && Counter <= 900)
	{
		frequency = 8000;
	}
	
	if (Counter <= 300)
	{
		Serial.println("Buzz");
		tone(BUZZER_PIN, frequency, 500, BUZZER_CHANNEL);
		noTone(BUZZER_PIN, BUZZER_CHANNEL);
		delay(500);
		tone(BUZZER_PIN, frequency, 500, BUZZER_CHANNEL);
		noTone(BUZZER_PIN, BUZZER_CHANNEL);
		delay(500);
	}
}