/*
  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>

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

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

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() {
  char dataBuff[8];

  int chk = DHT.read22(DHT_PIN);
  Serial.print(DHT.temperature, 1);
  Serial.print("\t");
  Serial.println(DHT.humidity, 1);
  snprintf(dataBuff, 8, "%4d %cC", (int)DHT.temperature, char(223));
  lcd.setCursor(9, 0);
  lcd.print(dataBuff);
  snprintf(dataBuff, 8, "%4d %%", (int)DHT.humidity);
  lcd.setCursor(9, 1);
  lcd.print(dataBuff);
  delay(2000);
}