#include <Wire.h>
#include <LiquidCrystal_I2C.h>
const int POT_PIN = A0;
const int BUTTON_PIN = 2;
const int LED_PIN = 3;
const int BUZZER_PIN = 9;
LiquidCrystal_I2C lcd(0x27, 16, 2);
bool ligado = false;
bool lastButtonState = HIGH;
void setup() {
 pinMode(BUTTON_PIN, INPUT_PULLUP);
 pinMode(LED_PIN, OUTPUT);
 pinMode(BUZZER_PIN, OUTPUT);
 lcd.init();
 lcd.backlight();
 Serial.begin(115200);
}
void loop() {
 bool currentButton = digitalRead(BUTTON_PIN);
 if (lastButtonState == HIGH && currentButton == LOW) {
 ligado = !ligado;
 delay(50);
 }
 lastButtonState = currentButton;
 int potValue = analogRead(POT_PIN);
 int freq = map(potValue, 0, 1023, 100, 2000);
 if (ligado) {
 tone(BUZZER_PIN, freq);
 digitalWrite(LED_PIN, HIGH);
 } else {
 noTone(BUZZER_PIN);
 digitalWrite(LED_PIN, LOW);
 }
 lcd.setCursor(0, 0);
  lcd.print("Pot: ");
 lcd.print(potValue);
 lcd.print(" ");
 lcd.setCursor(0, 1);
 lcd.print("Freq: ");
 lcd.print(freq);
 lcd.print(" Hz ");
 Serial.print("Pot: ");
 Serial.print(potValue);
 Serial.print(" | Freq: ");
 Serial.println(freq);
 delay(100);
}