/*
  Basic Parallel LCD Demo with DHT
  Shows basic wiring and writing to a parallel LCD module
  11/11/2025
*/

#include <LiquidCrystal.h>
#include <dht.h>

struct sensorData {
  float temperature;
  int humidity;
};

// pin constants
const int RS = 12, EN = 11, D4 = 10, D5 = 9, D6 = 8, D7 = 7;
const int DHT_PIN = 13;

sensorData dhtData;

// create objects
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);
dht DHT;

void showData() {
  Serial.print(dhtData.temperature, 1);
  Serial.print("\t");
  Serial.println(dhtData.humidity);
  lcd.setCursor(8, 0);
  lcd.print(dhtData.temperature, 1);
  lcd.print(char(223));
  lcd.print("C ");
  lcd.setCursor(10, 1);
  lcd.print(dhtData.humidity);
  lcd.print(" %");
}

void setup() {
  // start serial
  Serial.begin(9600);
  // start LCD
  lcd.begin(16, 2);
  // print a splash on the LCD
  lcd.setCursor(4, 0);
  lcd.print("DHT Demo");
  lcd.setCursor(6, 1);
  lcd.print("V1.0");
  delay(2000);
  lcd.clear();
  // print headers
  lcd.setCursor(0, 0);
  lcd.print("Temp:");
  lcd.setCursor(0, 1);
  lcd.print("Humidity:");
}

void loop() {
  int chk = DHT.read22(DHT_PIN);
  dhtData.temperature = DHT.temperature;
  dhtData.humidity = DHT.humidity;
  showData();
  delay(2000);
}