LCD+Tem+Distance+Lux

sensores.ino

#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR 0x3F
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7

#define trigPin 13
#define echoPin 12
#define led 11
#define led2 10

const int sensorPin = 0;
int lightLevel, high = 0, low = 1023;

const int temperaturePin = 1;

LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);

void setup() {
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(led, OUTPUT);
  pinMode(led2, OUTPUT);
  
  lcd.begin (20,4,LCD_5x8DOTS);
  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);

}

void loop() {
  
  lcd.setBacklight(HIGH);
  lcd.home ();

// Temperatura
  lcd.setCursor(0,3);
  float voltage, degreesC;
  voltage = getVoltage(temperaturePin);
  degreesC = (voltage - 0.5) * 100.0;
  lcd.print("Temperatura: ");
  lcd.print(degreesC);
  lcd.print(" C");
  
  
// Luminosidad  
  lightLevel = analogRead(sensorPin);
  lightLevel = map(lightLevel, 1023, 0, 0, 255);
  lightLevel = constrain(lightLevel, 0, 255);
  
  

  
  long duration, distance;
  digitalWrite(trigPin, LOW);  // Added this line
  delayMicroseconds(2); // Added this line
  digitalWrite(trigPin, HIGH);
//  delayMicroseconds(1000); - Removed this line
  delayMicroseconds(10); // Added this line
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
  if (distance < 4) {  // This is where the LED On/Off happens
    digitalWrite(led,HIGH); // When the Red condition is met, the Green LED should turn off
    digitalWrite(led2,LOW);
  }
  else {
    digitalWrite(led,LOW);
    digitalWrite(led2,HIGH);
  }
  
  if (distance < 20 && distance > 5){
    lcd.setCursor(0,0);
    lcd.print("Cuidado!!!          ");
  }
  if (distance < 5 && distance > 0){
    lcd.setCursor(0,0);
    lcd.print("Para ctm!!!         ");
  }
  if (distance > 20){
    lcd.setCursor(0,0);
    lcd.print("                   ");
  }
 
  lcd.setCursor(0,1);
  if (distance < 200) {
    lcd.print("Distancia ");
    lcd.print(distance);
    lcd.print(" cm    ");
  }
  else {
     lcd.print("Fuera de Rango... ");
  }
  lcd.setCursor(0,2);
  lcd.print("Luminosidad: ");
  lcd.print(lightLevel);
  lcd.print(" Lux");
  delay(50);
}

float getVoltage(int pin)
{
  return (analogRead(pin) * 0.004882814);
}