#include <LiquidCrystal.h>
LiquidCrystal lcd(PA6, PA5, PA4, PA3, PA2, PA1);
const int trigP = PB8;
const int echoP = PB9;
long duration;
int distanceCm;
float distanceM;

void setup() {
  lcd.begin(16, 2);
  lcd.print(" US Range Meter ");
  lcd.setCursor(0, 1);
  lcd.print("Cm:"); // Cm label at column 0 of row 1
  pinMode(trigP, OUTPUT);
  pinMode(echoP, INPUT);
  delay(1000);
}

void loop() {
  digitalWrite(trigP, LOW);
  delayMicroseconds(2);
  digitalWrite(trigP, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigP, LOW);
  duration = pulseIn(echoP, HIGH);
  distanceCm = duration * 0.034 / 2;
  distanceM = distanceCm / 100.0; // Convert to meters

  // Clear only the number part of the display to avoid flickering
  lcd.setCursor(3, 1);
  lcd.print("    ");
  lcd.setCursor(7, 1);
  lcd.print("    ");
  lcd.setCursor(11, 1);
  lcd.print("    ");

  // Print cm value
  lcd.setCursor(3, 1);
  lcd.print(distanceCm);
  lcd.print(" ");

  // Print m value (at column 11, row 1)
  lcd.setCursor(11, 1);
  lcd.print("M:");
  lcd.print(distanceM, 2); // 2 decimal places for meter

  delay(1000);
}