Electricity

• AC
• DC

digital in digital read

digital out digital rite

GPIO general purpose input output

right to rows of the breadboard

Neo Pixel

**Digital Input In Class Exercise

light two LEDs up**

#define grLEDPin 4
#define redLEDPin 3
#define switchPin 2
int delayAmount = 10;

void setup() {
  // put your setup code here, to run once:
  pinMode(grLEDPin,OUTPUT);
  pinMode(redLEDPin,OUTPUT);
  pinMode(switchPin,INPUT);

  Serial.begin(9600);
  }

void loop() {
  
  Serial.println("Hello");
  Serial.println(delayAmount);
   Serial.println(millis());
  delayAmount++;
  if (delayAmount>100){
    delayAmount=1;
    }
  // put your main code here, to run repeatedly:
  digitalWrite(grLEDPin,HIGH);
  digitalWrite(redLEDPin,LOW);
  delay(delayAmount);

  digitalWrite(grLEDPin,LOW);
  digitalWrite(redLEDPin,HIGH);
  delay(delayAmount);

  digitalWrite(grLEDPin,LOW);
  digitalWrite(redLEDPin,LOW);
  delay(delayAmount);
}

Use Switch to turn LEDs on

#define grLEDPin 4
#define redLEDPin 3
#define switchPin 2
int delayAmount = 10;

void setup() {
  // put your setup code here, to run once:
  pinMode(grLEDPin,OUTPUT);
  pinMode(redLEDPin,OUTPUT);
  pinMode(switchPin,INPUT);

  Serial.begin(9600);
  }

void loop() {

  int switchState = digitalRead(switchPin);
  
  Serial.println(switchState);  
  if (switchState==HIGH){

  digitalWrite(grLEDPin,HIGH);
  digitalWrite(redLEDPin,LOW);
  delay(delayAmount);

  digitalWrite(grLEDPin,LOW);
  digitalWrite(redLEDPin,HIGH);
  delay(delayAmount);

}
else{
  digitalWrite(grLEDPin,LOW);
  digitalWrite(redLEDPin,LOW);
  delay(delayAmount);
}
}

Or

#define grLEDPin 4
#define redLEDPin 3
#define switchPin 2
int delayAmount = 10;

void setup() {
  // put your setup code here, to run once:
  pinMode(grLEDPin,OUTPUT);
  pinMode(redLEDPin,OUTPUT);
  pinMode(switchPin,INPUT);

  Serial.begin(9600);
  }

void loop() {

  int switchState = digitalRead(switchPin);
  digitalWrite(grLEDPin, ! switchPin);

  Serial.println(switchState);  

}

Q

bool

int

The Arduino boards have a few pins which can generate a continuous PWM signal. On the Arduino Nano 33 IoT. they’re pins 2, 3, 5, 6, 9, 10, 11, 12, A2, A3, and A5. On the Arduino Uno, they’re pins 3, 5, 6, 9, 10, and 11. To control them, you use the analogWrite() command like so: