what each line of code does?

#define LED_1_PIN 12 #define LED_2_PIN 11 #define LED_3_PIN 10

#define BUTTON_PIN 2

#define POTENTIOMETER_PIN A2

unsigned long previousTimeLED1Blink = millis(); unsigned long blinkDelayLED1 = 500;

int LED1State = LOW;

void setup() { Serial.begin(9600); Serial.setTimeout(10);

pinMode(LED_1_PIN, OUTPUT); pinMode(LED_2_PIN, OUTPUT); pinMode(LED_3_PIN, OUTPUT);

pinMode(BUTTON_PIN, INPUT); }

void loop() { // action 1 if (Serial.available() > 0) { int data = Serial.parseInt(); if ((data >= 100) && (data <= 4000)) { blinkDelayLED1 = data; } }

// action 2 unsigned long timeNow = millis(); if (timeNow - previousTimeLED1Blink > blinkDelayLED1) { if (LED1State == LOW) { LED1State = HIGH; } else { LED1State = LOW; } digitalWrite(LED_1_PIN, LED1State); previousTimeLED1Blink += blinkDelayLED1; }

// action 3 int potentiometerValue = analogRead(POTENTIOMETER_PIN); int intensity = potentiometerValue / 4; analogWrite(LED_2_PIN, intensity);

// action 4 if (digitalRead(BUTTON_PIN) == HIGH) { digitalWrite(LED_3_PIN, HIGH); } else { digitalWrite(LED_3_PIN, LOW); } }