ChatGPT Arduino Accelerating Blinky, Attempt #2

/* Me: This doesn't work if the user presses the button while the delay is executing. */

/* ChatGPT: You are correct. If the button is pressed while the delay is executing, the code will not detect the button press until after the delay has finished.

One way to fix this issue is to use a timer to track the elapsed time since the last button press, rather than using a delay. This will allow the code to continue checking for button presses while the LED is blinking.

Here is an example of how this could be implemented: */


const int buttonPin = 2;    // pin for the button
const int ledPin = 13;      // pin for the LED
int blinkInterval = 1000;   // interval at which to blink (milliseconds)

// variables for tracking the button state
int buttonState = 0;    // current state of the button
int lastButtonState = 0; // previous state of the button

// variable for tracking the elapsed time
unsigned long previousMillis = 0;

void setup() {
  // set the LED pin as output
  pinMode(ledPin, OUTPUT);
  // set the button pin as input
  pinMode(buttonPin, INPUT);
}

void loop() {
  // read the button state
  buttonState = digitalRead(buttonPin);
  // check if the button state has changed
  if (buttonState != lastButtonState) {
    // check if the button is pressed
    if (buttonState == HIGH) {
      // decrease the blink interval
      blinkInterval = max(blinkInterval - 100, 100);
    }
    // save the current button state as the last button state
    lastButtonState = buttonState;
  }
  // get the current time
  unsigned long currentMillis = millis();
  // check if the elapsed time is greater than the blink interval
  if (currentMillis - previousMillis >= blinkInterval) {
    // turn the LED on
    digitalWrite(ledPin, HIGH);
    // save the current time as the previous time
    previousMillis = currentMillis;
  }
  // check if the elapsed time is greater than half the blink interval
  else if (currentMillis - previousMillis >= blinkInterval / 2) {
    // turn the LED off
    digitalWrite(ledPin, LOW);
    // save the current time as the previous time
    previousMillis = currentMillis;
  }
}