//Define Digital 
// Pin 3,5,6,9,10,11 have hardware ~ PWM support.
#define PinD0 0  // D0/RX     PD0   RX LED    Serial (USART)	RX        GPIO
#define PinD1 1  // D1/TX     PD1   TX LED    Serial (USART)	TX        GPIO
#define PinD2 2  // D2        PD2             External interrupt	INT0  GPIO
#define PinD3 3  // D3~       PD3             External interrupt	INT1  GPIO
#define PinD4 4  // D4        PD4                                       GPIO  
#define PinD5 5  // D5~       PD5                                       GPIO
#define PinD6 6  // D6~       PD6                                       GPIO
#define PinD7 7  // D7        PD7                                       GPIO
#define PinD8 8  // D8        PB0                                       GPIO  
#define PinD9 9  // D9~       PB1                                       GPIO
#define PinD10 10 // D10~      PB2             SPI	SS   (Chip select)    
#define PinD11 11 // D11~      PB3             SPI	MOSI (Main Out Secondary In)               
#define PinD12 12 // D12       PB4             SPI	MISO (Main In Secondary Out)              
#define PinD13 13 // D13       PB5     LED     SPI	SCK  (Serial clock output)        
//      PinA4_2   // D18/A4    PC4             I2C	SDA  (Data)  (duplicated)
//      PinA5_2   // D19/A5    PC5             I2C	SCL  (Clock) (duplicated)
//Define Analog  
#define PinA0 14  // D14/A0    PC0                       ADC[0]    GPIO
#define PinA1 15  // D15/A1    PC1                       ADC[1]    GPIO
#define PinA2 16  // D16/A2    PC2                       ADC[2]    GPIO
#define PinA3 17  // D17/A3    PC3                       ADC[3]    GPIO
#define PinA4 18  // D18/A4    PC4     I2C	SDA (Data)   ADC[4]    
#define PinA5 19  // D19/A5    PC5     I2C	SCL (Clock)  ADC[5]    

//ICSP (In-circuit serial programming)
// P1 Atmega328 Serial Wire Debug (MISO)*
// P2 Atmega328 Serial Wire Debug (VCC)
// P3 Atmega328 Serial Wire Debug (SCK)
// P4 Atmega328 Serial Wire Debug (MOSI)
// P5 Atmega328 Serial Wire Debug (RESET)
// P6 Atmega328 Serial Wire Debug (GND)

//Define Other
// +3V3      +3V3 Power Rail Output
// +5V       +5V  Power Rail Output
// GND       Ground
// VIN       Voltage Input 5-12V
// USB VCC   Voltage Input 5V
// RESET     Reset
// AREF      Analog reference voltage
// IOREF     Reference for digital logic V - connected to 5V

// Other
//  8 bit timer    Timer0, Timer 2
// 16 bit timer    Timer1,
// GPIO            General IO/ Including External/ Pin Change Interrupts  
// Watchdog Timer	 Usage example

#define CycleTime 250

void setup() {
  // put your setup code here, to run once:
  pinMode(PinD0, OUTPUT);
  pinMode(PinD1, OUTPUT);
  pinMode(PinD2, OUTPUT);
  pinMode(PinD3, OUTPUT);
  pinMode(PinD4, OUTPUT);
  pinMode(PinD5, OUTPUT);
  pinMode(PinD6, OUTPUT);
  pinMode(PinD7, OUTPUT);
  pinMode(PinD8, OUTPUT);
  pinMode(PinD9, OUTPUT);
  pinMode(PinD10, OUTPUT);
  pinMode(PinD11, OUTPUT);
  pinMode(PinD12, OUTPUT);
  pinMode(PinD13, OUTPUT);
  pinMode(PinA0, OUTPUT);
  pinMode(PinA1, OUTPUT);
  pinMode(PinA2, OUTPUT);
  pinMode(PinA3, OUTPUT);
  pinMode(PinA4, OUTPUT);
  pinMode(PinA5, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(PinD0, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD1, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD0, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinD2, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD1, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinD3, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD2, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinD4, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD3, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinD5, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD4, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinD6, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD5, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinD7, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD6, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinD8, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD7, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinD9, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD8, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinD10, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD9, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinD11, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD10, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinD12, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD11, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinD13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD12, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinA0, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinD13, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinA1, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinA0, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinA2, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinA1, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinA3, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinA2, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinA4, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinA3, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(PinA5, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinA4, LOW);    // turn the LED off by making the voltage LOW
  delay(CycleTime);                       // wait for a second
  digitalWrite(PinA5, LOW);    // turn the LED off by making the voltage LOW
  delay(CycleTime);                       // wait for a second
  }