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Week1

Xuedan Gao

First Attempt
#

In my first attempt, watch here, I failed because I didn’t store the button state. This caused the counter to increment too quickly.

if (btnState == HIGH) 
{
  counter++;
}

Second Attempt (Success)
#

After storing the button state, I successfully solved the issue. You can watch it here.

if(prevbtnState != btnState)
  {
    if (btnState == HIGH) 
    {
      counter++;
    }
  }
  prevbtnState = btnState;

The code:
# 

int counter = 0; 
int prevbtnState = LOW;

void setup() {
  pinMode(2, INPUT);
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  Serial.begin(9600);
}

void updateCounter() {
  int btnState = digitalRead(2);
  
  if(prevbtnState != btnState) {
    if (btnState == HIGH) {
      counter++;
    }
  }
  prevbtnState = btnState;
}

void controlLEDs() {
  if (counter % 3 == 0) {
    digitalWrite(13, LOW);
    digitalWrite(12, LOW);
  }
  
  if (counter % 3 == 1) {
    digitalWrite(13, HIGH);
    digitalWrite(12, LOW);
  }
  
  if (counter % 3 == 2) {
    digitalWrite(13, HIGH);
    digitalWrite(12, HIGH);
  }
}

void loop() {
  updateCounter();
  controlLEDs();
  delay(10);
}
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