blink.c

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO 
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino model, check
  the Technical Specs of your board  at https://www.arduino.cc/en/Main/Products
  
  This example code is in the public domain.

  modified 8 May 2014
  by Scott Fitzgerald
  
  modified 2 Sep 2016
  by Arturo Guadalupi
  
  modified 8 Sep 2016
  by Colby Newman

  modified 2017-01-06 by Lloyd Leung to be used with the top for pins of an ESP8266 ESP-12e nodeMCU lua dev board.

*/



int timer = 2000;           // The higher the number, the slower the timing.
int ledPins[] = {
  16, 5, 4, 0
};       // an array of pin numbers to which LEDs are attached
int pinCount = 4;

void setup() {
    Serial.begin(115200);
    delay(10);


    Serial.println();
    Serial.println();

  
  // the array elements are numbered from 0 to (pinCount - 1).
  // use a for loop to initialize each pin as an output:
  for (int thisPin = 0; thisPin < pinCount; thisPin++) {
    pinMode(ledPins[thisPin], OUTPUT);
    Serial.print("Turned pin ");
    Serial.print(String(thisPin));
    Serial.println(" to an OUTPUT pin");
  }

    Serial.println();
    Serial.println();

}


void readPin(int thisPin){
    Serial.print("Reading pin ");
    Serial.print(thisPin);

    if(digitalRead(ledPins[thisPin])){
        Serial.println(" HIGH");
    }else {
        Serial.println(" LOW");
    }
}

void onOff(int thisPin) {
      // turn the pin on:
    digitalWrite(ledPins[thisPin], HIGH);
    Serial.print(thisPin);
    Serial.println("Pin is set HIGH");


    delay(timer);
    readPin(thisPin);
    
    // turn the pin off:
    digitalWrite(ledPins[thisPin], LOW);
    Serial.print(thisPin);
    Serial.println("Pin is set LOW");
    delay(timer);

    readPin(thisPin);

    Serial.println();
    Serial.println();

}



// the loop function runs over and over again forever
void loop() {
  
 // loop from the lowest pin to the highest:
  for (int thisPin = 0; thisPin < pinCount; thisPin++) {
    onOff(thisPin);
  }

  // loop from the highest pin to the lowest:
  for (int thisPin = pinCount - 1; thisPin >= 0; thisPin--) {
    onOff(thisPin);
  }

}