// BY THEO FAUCHER

#include <Wire.h>
#include <SeeedOLED.h>
#include <SPI.h>

void setup()
{
  Wire.begin();
  SeeedOled.init();  //initialze SEEED OLED display
  DDRB|=0x21;
  PORTB |= 0x21;
  SPI.setBitOrder(MSBFIRST);
  SPI.setDataMode(0);     // bit actif sur front montant de clock
  SPI.setClockDivider(8); // clock initiale à 2,5MHz...
  SPI.begin();
  Serial.begin(115200);
  SeeedOled.clearDisplay();           //clear the screen and set start position to top left corner
  SeeedOled.setNormalDisplay();       //Set display to Normal mode
  SeeedOled.setPageMode();            //Set addressing mode to Page Mode
  SeeedOled.setTextXY(4,4);          //Set the cursor to Xth Page, Yth Column
}

void ecritureOctet(int octet1, int octet2, int octet3)
{
  SPI.transfer(octet1);
  SPI.transfer(octet2);
  SPI.transfer(octet3);
}

void loop()
{
  int ValeurPotar = analogRead(A0);
  int Tension = ValeurPotar*5/1023.0;
  Serial.print(Tension);
  Serial.print(" Volt");

  if (Tension < 2) {
      ecritureOctet(0, 255, 0);
      Serial.print("Couleur: Vert");
      SeeedOled.setTextXY(4,4);
      SeeedOled.putString("Couleur: Vert");

  }

  if (Tension >= 2 && Tension < 4) {
      ecritureOctet(255, 0, 0);
      Serial.print("Couleur: Rouge");
      SeeedOled.setTextXY(4,4);
      SeeedOled.putString("Couleur: Rouge");

  }

  if (Tension >= 4) {
      ecritureOctet(0, 0, 255);
      Serial.print("Couleur: Bleu");
      SeeedOled.setTextXY(4,4);
      SeeedOled.putString("Couleur: Bleu");

  }
}