Robin & Carly Arduino

Button

We were able to achieve both LEDs turn on 

immediately after the push of a button and stay on.

Fade

We used the button instead for our fading LED

as well. By holding the button, the LED would 

become brighter and then loop again and again.

const int LED = 13; // the pin for the LED

const int BUTTON = 7; // the input pin where the

// pushbutton is connected

int val = 0; // val will be used to store the state

// of the input pin

int old_val = 0; // this variable stores the previous

// value of "val"

int state = 0; // 0 = LED off and 1 = LED on

void setup() {

pinMode(LED, OUTPUT); // tell Arduino LED is an output

pinMode(BUTTON, INPUT); // and BUTTON is an input

}

void loop(){

val = digitalRead(BUTTON); // read input value and store it

// yum, fresh

// check if there was a transition

if ((val == HIGH) && (old_val == LOW)){

state = 1 - state;

delay(10);

}

old_val = val; // val is now old, let's store it

if (state == 1) {

digitalWrite(LED, HIGH); // turn LED ON

} else {

digitalWrite(LED, LOW);

}

}

Sensor

Using a potentiometer, we were able to control

1. the speed of the blinking

2. the intensity of the LED

through two different codes, but same arrangement.

//CHANGING SPEED

int sensorPin = A0;

int LED = 9;

int sensorValue = 30;

void setup () {

  pinMode (LED, OUTPUT);

}

void loop () {

  sensorValue = analogRead(sensorPin);

  digitalWrite(LED, HIGH); 

  delay(sensorValue);

  digitalWrite(LED, LOW);

  delay(sensorValue);

}

//CHANGING INTENSITY

int KNOB = A0;

int LED = 9;

int sensorValue = 0;

int outputValue = 0;

int knobValue = 0;

void setup() {

  pinMode (LED, OUTPUT);

  Serial.begin(9600);

}

void loop() {

  int knobValue = analogRead(A0);

  outputValue = map(knobValue, 0, 1023, 0, 255);

  analogWrite(LED, outputValue);

  Serial.println(outputValue); 

  delay (10);

  

}

Actuator

Instead of using LEDs, we used a speaker 

from a toy as an output still using the 

potentiometer. During the process, however

the chord broke off the speaker, so we were

unable to see if it worked. 

int speaker = 11;
int val = 0;

void setup ( ) {
  pinMode(speaker, OUTPUT);
  }

void loop ( ) {
  val = analogRead(0);
  tone(speaker, (2*val)-500); // 2 sets range & 500 determines pitch
  }