/*
  Blink
  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink

  Fade
  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Fade

  ReadAnalogVoltage
  https://www.arduino.cc/en/Tutorial/BuiltInExamples/ReadAnalogVoltage

  DigitalReadSerial
  https://www.arduino.cc/en/Tutorial/BuiltInExamples/DigitalReadSerial

*/

int led = 9;         // the PWM pin the LED is attached to
int brightness = 0;  // how bright the LED is
int fadeAmount = 5;  // how many points to fade the LED by

// digital pin 2 has a pushbutton attached to it. Give it a name:
int pushButton = 2;

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);

  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);

  // declare pin 9 to be an output:
  pinMode(led, OUTPUT);

  // make the pushbutton's pin an input:
  pinMode(pushButton, INPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(100);                      // wait for a second
  digitalWrite(LED_BUILTIN, LOW);   // turn the LED off by making the voltage LOW
  delay(100);                      // wait for a second

  // set the brightness of pin 9:
  analogWrite(led, brightness);

  // change the brightness for next time through the loop:
  brightness = brightness + fadeAmount;

  // reverse the direction of the fading at the ends of the fade:
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  }
  // wait for 30 milliseconds to see the dimming effect
  delay(30);

  //start of readanalogue voltage
  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  float voltage = sensorValue * (5.0 / 1023.0);
  // print out the value you read:
  Serial.println(voltage);
  //end of analogue voltage

  // read the input pin:
  int buttonState = digitalRead(pushButton);
  // print out the state of the button:
  Serial.println(buttonState);
  delay(1);  // delay in between reads for stability

}