Arduino Relays

/*********************************************************************
  This is an example for our Monochrome OLEDs based on SSD1306 drivers

  Pick one up today in the adafruit shop!
  ------> http://www.adafruit.com/category/63_98

  This example is for a 128x64 size display using I2C to communicate
  3 pins are required to interface (2 I2C and one reset)

  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada  for Adafruit Industries.
  BSD license, check license.txt for more information
  All text above, and the splash screen must be included in any redistribution
*********************************************************************/

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

#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

#if (SSD1306_LCDHEIGHT != 64)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif
#define RELAY1 4
#define RELAY2 5
#define RELAY3 6
#define RELAY4 7
#define DELAY 1000

void setup()   {
  Serial.begin(9600);
  pinMode(RELAY1, OUTPUT);
  pinMode(RELAY2, OUTPUT);
  pinMode(RELAY3, OUTPUT);
  pinMode(RELAY4, OUTPUT);

  // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3D (for the 128x64)
  // init done

    display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.setCursor(30, 0);
  display.println("Relays");
  display.setCursor(0, 20);
  display.println("1 2 3 4");
  display.display();
  switchRelay(RELAY1, 0, false);
  switchRelay(RELAY2, 1, false);
  switchRelay(RELAY3, 2, false);
  switchRelay(RELAY4, 3, false);
}


void loop() {
   // 1 = OFF; 0 = ON

   // Relay 1 ON
   switchRelay(RELAY1, 0, true);
   delay(DELAY);

   // Relay 2 ON
   switchRelay(RELAY2, 1, true);
   delay(DELAY);

   // Relay 3 ON
   switchRelay(RELAY3, 2, true);
   delay(DELAY);

   // Relay 4 ON
   switchRelay(RELAY4, 3, true);
   delay(DELAY);

   // Relay 1 OFF
   switchRelay(RELAY1, 0, false);
   delay(DELAY);

   // Relay 2 OFF
   switchRelay(RELAY2, 1, false);
   delay(DELAY);

   // Relay 3 OFF
   switchRelay(RELAY3, 2, false);
   delay(DELAY);

   // Relay 4 OFF
   switchRelay(RELAY4, 3, false);
   delay(DELAY);
}

void switchRelay(int port, int order, bool state) {
  digitalWrite(port, state ? 0 : 1);
  display.fillRect(order*24, 35, 15, 15, (uint8_t)0);
  display.setTextSize(2);
  display.setCursor(order*24, 35);
  display.print(state ? "I " : "O ");
  display.display();
}