/* JTR 2020-09-14: Created, Thermostat with User Interface
 
 */ 

#include <Arduino.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT_U.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for SSD1306 display connected using software SPI (default case):
#define OLED_CLK   14 // OLED: D0
#define OLED_MOSI  13 // OLED: D1
#define OLED_RST   22 // OLED: RES
#define OLED_DC    17 // (ESP32-"TX2") OLED: DC
#define OLED_CS    23 // OLED: CS

#define DHTPIN    26 
#define DHTTYPE DHT11   // DHT 11

#define POTI_IN   27

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,OLED_MOSI, OLED_CLK, OLED_DC, OLED_RST, OLED_CS);
DHT dht(DHTPIN, DHTTYPE); 

void setup() {

  Serial.begin(115200);
  delay(1250);
  
  Serial.println("GO!.");

  dht.begin();

  if(!display.begin(SSD1306_SWITCHCAPVCC)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  // Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  display.clearDisplay();
  display.display();

  display.setTextSize(1);             // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE);        // Draw white text
  display.setCursor(0,0);             // Start at top-left corner
  display.println(F("Starting..."));
  display.display();
  delay(1000);
}

void loop() {
    float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

   if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.println(F("°F"));

  int potiLvl=analogRead(POTI_IN); // -> 0-4095
  Serial.print("Poti: ");
  Serial.println(potiLvl);

  display.clearDisplay();

  display.setTextSize(2);             // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE);        // Draw white text
  display.setCursor(0,0);             // Start at top-left corner
  display.println(String(potiLvl));
  display.display();

 delay(500);
}