Arduino lab programming 2 ENGR 111 UofL

main.c

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(A0, INPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
}

float lastUpdTime = 0;
const float updLimit = 1000/3;

int DISP_FPLIM() {
  if (millis() - lastUpdTime <= updLimit) {
    return 0;
  }
  lastUpdTime = millis();
  return 1;
}

void loop() {
  // PRGM 1
  float x = float(analogRead(A0));
  if (!DISP_FPLIM()) return;
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(String(x));
  // PRGM 2
  lcd.setCursor(0,1);
  float v = 5 * x / 1023;
  lcd.print(String(v) + " V");

  // ADC Mode
  digitalWrite(2, v > 2.5 ? HIGH : LOW);

  analogWrite(3, v / 5 * 255);

}