// Sietse Jonker & Dano Bosch
// 13/02/2024

#include <Wire.h>
#include <Adafruit_SH110X.h>
#include <Adafruit_SGP30.h>
#include <DHT.h>

#define MICPIN 6
#define DHTPIN 7
#define SCL 9
#define SDA 8
#define DHTTYPE DHT11
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define i2c_adress 0x3c

Adafruit_SH1106G display = Adafruit_SH1106G(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire);
DHT dht(DHTPIN, DHTTYPE);

Adafruit_SGP30 sgp;

uint16_t TVOC_base, eCO2_base;
uint16_t counter = 0;
float temperature = 0;
float humidity = 0;
uint16_t eCO2 = 0;
uint16_t TVOC = 0;
bool noise = false;

void resetValues() {
  TVOC_base;
  eCO2_base;
  counter = 0;
  temperature = 0;
  humidity = 0;
  eCO2 = 0;
  TVOC = 0;
  noise = false;
}

void displayData() {
  // clear display for new info
  display.clearDisplay();

  // set custom text properties
  display.setTextSize(2);
  display.setTextColor(SH110X_WHITE);
  display.setCursor(0, 0);

  // display info on oled screen
  display.println((String) "Temp: " + int(temperature) + "C" + '\n'
    + "Humi: " + int(humidity) + "%" + '\n'
    + "eCO2: " + int(sgp.eCO2) + '\n'
    + "TVOC: " + int(sgp.TVOC));
                  
  display.display();
}

void setup() {
  Serial.begin(115200);

  // tell display what settings to use
  display.begin(i2c_adress, true);
  display.clearDisplay();

  // tell sensors to start reading
  dht.begin();
  sgp.begin();

  pinMode(MICPIN, INPUT);
  pinMode(DHTPIN, INPUT);

  resetValues();
}

void loop() {
  // if sensor doesnt work print in serialmonitor
  if (!sgp.IAQmeasure()) {
    Serial.println("SGP30: BAD");
    return;
  } else {
    Serial.println("SGP30: OK");
  }

  // read dht11 sensor
  temperature = float(dht.readTemperature());
  humidity = float(dht.readHumidity());

  // display sensordata on oled screen
  displayData();

  // get new baseline every 30 seconds
  if (counter == 30) {
    sgp.getIAQBaseline(&eCO2_base, &TVOC_base);
  }
  delay(1000);
  counter++;
}