Week 01 | Arduino Basis

Code

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int i=0;
int lastButtonState = LOW;
int currentButtonState;

void setup() {
// initialize digital pin LED_BUILTIN as an output.
pinMode(15, OUTPUT);
pinMode(14, OUTPUT);
pinMode(16,INPUT);
digitalWrite(15,LOW);
digitalWrite(14,LOW);
Serial.begin(9600);
}

void loop() {
currentButtonState = digitalRead(16);
Serial.println(currentButtonState);
if(currentButtonState == HIGH && lastButtonState == LOW){
  i=i+1;
}
if(i>2){
  i=0;
}

lastButtonState = currentButtonState;

if(i==1){
  analogWrite(15,255);//analogWrite is value between 0-255
  analogWrite(14,0);
}
else if(i==2){
  analogWrite(14,255);
  analogWrite(15,255);
}
else if(i==0){
  analogWrite(14,0);
  analogWrite(15,0);
}
delay(50);//debuncing
}

Self-Reflection - coding

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The logic of hardware computing is the same with processing and Java

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At first, I face some problem with coding because I am a new learning of coding(only java), so it’s hard for me to migrate knowledge from Java class to hardware computing. My problem is that, I thought the actions, 2 times of pressing bottom, transform the same HIGH signal to the Pico board, how can it be detected by the board into different information and trigger two LED? But through the hint of my classmate, counting, I realize the logic is the same, just use math.

The if condition part

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I find it hard to set the suitable if condition at first, this is my initial coding:

int i=0;
Button = digitalRead(16);
if(Button == 1){
  i=i+1;
}
if(Button == 0){
  i=0;
}
if(i==1){
  analogWrite(15,255);//analogWrite is value between 0-255
  analogWrite(14,0);
}
else if(i==2){
  analogWrite(14,255);
  analogWrite(15,255);
}
else if(i==0){
  analogWrite(14,0);
  analogWrite(15,0);
}

The problom of this is that the value of i will keep couting from 0 to 1, 2, 3, 4… And this will cause the LEDs only light up for a short second. So we need to stop the counting when i=2. And what we want is that only do the math when the last buttom state is LOW, the current state is HIGH, so I change the if condition.

Circuit

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Question

• I have one problem: why we need introduce an other resistor for the second LED? Because I test only use one LED, it is still lighted up(but without the buttom control).