#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>

const int pinSS[2][8] = {{33, 32, 12, 14, 27, 25, 26, 13}, {5, 17, 4, 2, 15, 18, 19, 16}};
// segments: a, b, c, d, e, f, g, dp

const int hex_number[] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F};
// in binary: 00111111, 00000110, 01011011, 01001111, 01100110, 01101101,01111101, 00000111, 01111111, 01101111

const int seaLevel = 1015; // in hPa
// data from https://www.ventusky.com/bandung

Adafruit_BMP280 bmp;
float temperature;
float pressure;
float altitude;

void changeNumber(int ssNumber, int number) {
  for (int i = 0; i < 8; i++) {
    digitalWrite(pinSS[ssNumber - 1][i], !((hex_number[number] >> i) & 0x1));
  }
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  bmp.begin(0x76);

  for (int i = 0; i < 8; i++) {
    pinMode(pinSS[0][i], OUTPUT);
    pinMode(pinSS[1][i], OUTPUT);
    digitalWrite(pinSS[0][i], HIGH);
    digitalWrite(pinSS[1][i], HIGH);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  temperature = bmp.readTemperature();
  pressure = bmp.readPressure();
  altitude = bmp.readAltitude();

  changeNumber(1, (int)(floor(temperature) / 10));
  changeNumber(2, (int)(floor(temperature)) % 10);

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" oC");

  Serial.print("Pressure: ");
  Serial.print(pressure);
  Serial.println(" Pa");

  Serial.print("Altitude: ");
  Serial.print(altitude);
  Serial.println(" m");

  Serial.println("--------------------");
  delay(2000);
}