Blink.ino

// Pin config
const uint8_t button1Pin = 3; // Button 1
const uint8_t button2Pin = 4; // Button 2
const uint8_t led1Pin = 5; // LED 1
const uint8_t led2Pin = 6; // LED 2
// Button states
bool button1State = LOW;
bool button2State = LOW;
bool button1LastState = LOW;
bool button2LastState = LOW;
// Blink bools
bool blink1Enabled = false;
bool blink2Enabled = false;
// Blink1 timers
bool led1Phase = HIGH;
unsigned long blink1OnPhaseEndTime = 0;
unsigned long blink1OffPhaseEndTime = 0;
// Blink2 timers
bool led2Phase = HIGH;
unsigned long blink2OnPhaseEndTime = 0;
unsigned long blink2OffPhaseEndTime = 0;
// Arduino Setup
void setup() {
  pinMode(button1Pin, INPUT);
  pinMode(button2Pin, INPUT);
  pinMode(led1Pin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
}
// Arduino Loop
void loop() {
  checkButtons();
  if (blink1Enabled) {
    blink1();
  }
  if (blink2Enabled) {
    blink2();
  }
}
// Check button states
void checkButtons() {
  button1State = digitalRead(button1Pin);
  button2State = digitalRead(button2Pin);
  if (button1State != button1LastState) {
    button1LastState = button1State;
    if (button1State == HIGH) {
      setupLeds();
      blink1Enabled = true;
    } else {
      blink1Enabled = false;
    }
  }
  if (button2State != button2LastState) {
    button2LastState = button2State;
    if (button2State == HIGH) {
      setupLeds();
      blink2Enabled = true;
    } else {
      blink2Enabled = false;
    }
  }
}
// Blink LED 1
void blink1() {
  if (led1Phase == HIGH) { // ON Phase
    if (blink1OnPhaseEndTime == 0) {
      blink1OnPhaseEndTime = millis() + 1000;
    }
    if (millis() >= blink1OnPhaseEndTime) {
      blink1OnPhaseEndTime = 0;
      led1Phase = LOW;
      digitalWrite(led1Pin, LOW);
    }
  } else { // OFF Phase
    if (blink1OffPhaseEndTime == 0) {
      blink1OffPhaseEndTime = millis() + 1000;
    }
    if(millis() >= blink1OffPhaseEndTime) {
      blink1OffPhaseEndTime = 0;
      led1Phase = HIGH;
      digitalWrite(led1Pin, HIGH);
    }
  }
}
// Blink LED 2
void blink2() {
  if (led2Phase == HIGH) { // ON Phase
    if (blink2OnPhaseEndTime == 0) {
      blink2OnPhaseEndTime = millis() + 1000;
    }
    if (millis() >= blink2OnPhaseEndTime) {
      blink2OnPhaseEndTime = 0;
      led2Phase = LOW;
      digitalWrite(led2Pin, LOW);
    }
  } else { // OFF Phase
    if (blink2OffPhaseEndTime == 0) {
      blink2OffPhaseEndTime = millis() + 1000;
    }
    if(millis() >= blink2OffPhaseEndTime) {
      blink2OffPhaseEndTime = 0;
      led2Phase = HIGH;
      digitalWrite(led2Pin, HIGH);
    }
  }
}
// Setup
void setupLeds() {
  digitalWrite(led1Pin, HIGH);
  digitalWrite(led2Pin, HIGH);
}