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

const int pressureInput = A0;
const int pressureZero = 102.4;
const int pressureMax = 921.6;
const int pressureTransducerMaxPSI = 100;
const int baudRate = 9600;
const int sensorReadDelay = 250;

int LED1 = 13;
int LED2 = 12;
float pressureValue = 0;

LiquidCrystal_I2C lcd(0x27, 20, 4);


void setup()
{
  Serial.begin(baudRate);
  lcd.init();
  lcd.init();
  lcd.backlight();
}

void loop()
{
  pressureValue = analogRead(pressureInput);
  pressureValue = ((pressureValue - pressureZero) * pressureTransducerMaxPSI) / (pressureMax - pressureZero);
  Serial.print(pressureValue, 1);
  Serial.println("PSI");
  lcd.setCursor(0, 0);
  lcd.print("Pressure:");
  lcd.print(pressureValue, 1);
  lcd.print("psi");
  lcd.print("psi");
  delay(sensorReadDelay);

}