#include <avr/dtostrf.h>
#include <DHT.h>
#define DHTPIN 11     // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
DHT dht(DHTPIN, DHTTYPE);

#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"


#define TFT_CS 17
#define TFT_DC 15
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

// global variabelen
float h,t,oh,ot;

void setup() {
  // put your setup code here, to run once:

  tft.begin();
  dht.begin();

  h = dht.readHumidity();
  t = dht.readTemperature();

  // nieuwe tekst schrijven 
  tft_txt(h,t,ILI9341_RED,ILI9341_GREEN);
  // waarden opslaan
  oh = h;
  ot = t;


}

void loop() {
  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)

  h = dht.readHumidity();
  t = dht.readTemperature();

  // vorige tekst overschrijven in zwarte kleur
  tft_txt(oh,ot,ILI9341_BLACK,ILI9341_BLACK);
  // nieuwe tekst schrijven
  tft_txt(h,t,ILI9341_RED,ILI9341_GREEN);

  // waarden opslaan
  oh = h;
  ot = t;

  delay(1000);
}

void tft_txt(float h, float t, unsigned int ch, unsigned int ct) {
  char buffer[10];
  tft.setCursor(0,0);
  tft.setTextColor(ch);
  tft.setTextSize(2);
  tft.print("Humidity: ");
  
  dtostrf(h, 6, 2, buffer);
  
  tft.print(buffer);

  tft.setCursor(0,40);
  tft.setTextColor(ct);
  tft.setTextSize(2);
  tft.print("Temperature: ");
  tft.print(t);

}