EE47 Lab 3

Tom Cohlmia

4/19/2013

 

A.a. I would change the duration numbers from 4 to 8 and 8 to 16.

  4, 8, 8, 4,4,4,4,4     to      8, 16, 16, 8,8,8,8,8

 

A.b. The Star Wars theme!

 

B.a. 5V

 

B.b. I initally set the potentiometer too high (or low) and couldn't see anything. I had to re-upload and adjust the dial. I also needed to turn on the backlight because it was really hard to see.

 

B.c.  I changed lcd.print("hello, world!"); to lcd.print("Tom Cohlmia");

 

 

C.1.a. LED dimming code using A0:

 

int sensorPin = A0;    // select the input pin for the potentiometer

int ledPin = 13;      // select the pin for the LED

int sensorValue = 0;  // variable to store the value coming from the sensor

 

void setup() {

  // declare the ledPin as an OUTPUT:

  pinMode(ledPin, OUTPUT);  

  Serial.begin(9600);

}

 

void loop() {

  // read the value from the sensor:

  sensorValue = analogRead(sensorPin);  

  sensorValue = map(sensorValue, 0, 1024, 5, 250);

  // turn the ledPin on

  analogWrite(ledPin, sensorValue);  

  // stop the program for <sensorValue> milliseconds:

  Serial.println(sensorValue);

  delay(30);                   

}

 

 

 

C.2.a. Flex sensor range: 22.5-58 kOhms

 

C.2.b.

     R1 = 22.5-58 kOhms

     R2 = 24 kOhms

     Vi = 3.3V

     Vo = Vi*R2/(R1+R2)

     Vo = 0.96-1.70V

 

C.2.c. The output ranges I am capable of doing are very different from the inputs I'd like to use for the LED, so I need to use map() to convert them into something more useful.

 

C.2.d.

Code using a flex sensor to adjust an LED's brightness, using the LCD to output the V0 measured at Analog ipnut A0.

 

 

// include the library code:

#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins

LiquidCrystal lcd(12, 11, 5, 4, 3, 2); 

int sensorPin = A0;    // select the input pin for the potentiometer

int ledPin = 13;      // select the pin for the LED

int sensorValue = 0;  // variable to store the value coming from the sensor

 

 

 

void setup() {

  // declare the ledPin as an OUTPUT:

  pinMode(ledPin, OUTPUT);  

  lcd.begin(16, 2);

  Serial.begin(9600);

}

 

void loop() {

  // read the value from the sensor:

  sensorValue = analogRead(sensorPin);

  lcd.print(sensorValue);  

  Serial.println(sensorValue);

  sensorValue = map(sensorValue, 85, 220, 5, 250);

  // turn the ledPin on

  analogWrite(ledPin, sensorValue);  

  // stop the program for <sensorValue> milliseconds:

  delay(100);

  lcd.clear(); 

}

 

 

 

C.3.a. 0.25-INF kOhms

C.3.b. It seems to be reverse exponential; at first it's infinite resistance

C.3.c. Copy of thumb wrestling code:

 

// include the library code:

#include <LiquidCrystal.h>

 

// initialize the library with the numbers of the interface pins

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

 

 

int sensorPin1 = A0;    // select the input pin for the potentiometer

int sensorPin2 = A1;    // select the input pin for the potentiometer

int ledPin = 13;      // select the pin for the LED

int sensorValue1 = 0;  // variable to store the value coming from the sensor

int sensorValue2 = 0;  // variable to store the value coming from the sensor

 

 

 

void setup() {

  // declare the ledPin as an OUTPUT:

  pinMode(ledPin, OUTPUT);  

  lcd.begin(16, 2);

  Serial.begin(9600);

}

 

void loop() {

  // read the value from the sensor:

  sensorValue1 = analogRead(sensorPin1);

  sensorValue2 = analogRead(sensorPin2);

  lcd.println(sensorValue1);  

  lcd.print(sensorValue2);  

  Serial.println(sensorValue1);

  sensorValue1 = map(sensorValue1, 0, 700, 5, 250);

  // turn the ledPin on

  analogWrite(ledPin, sensorValue1);  

  // stop the program for 100 milliseconds:

  delay(100);

  lcd.clear(); 

}

 

 

D. Timer code:

 

// include the library code:

#include <LiquidCrystal.h>

#include "pitches.h"

 

// initialize the library with the numbers of the interface pins

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

 

 

 

int sensorPin1 = A0;    // select the input pin for the potentiometer

int sensorPin2 = A1;    // select the input pin for the potentiometer

int ledPin = 13;      // select the pin for the LED

int sensorValue1 = 0;  // variable to store the value coming from the sensor

int sensorValue2 = 0;  // variable to store the value coming from the sensor

int startcheck = 0;

long timerset = 0;

int melody[] = {

  NOTE_C6, NOTE_D6,NOTE_C6, NOTE_D6, NOTE_C6, NOTE_D6, NOTE_C6, NOTE_D6};

int noteDurations[] = {

  16,16,16,16,16,16,16,16 };

 

 

void setup() {

  // declare the ledPin as an OUTPUT:

  pinMode(ledPin, OUTPUT);  

  lcd.begin(16, 2);

  Serial.begin(9600);

  lcd.setCursor(0, 0); 

  lcd.print("<- Squeeze 1 to");

  lcd.setCursor(0, 1); 

  lcd.print("set timer");

}

 

void loop() {

  // read the value from the sensor:

  while (startcheck==0) {

    if (analogRead(sensorPin1) > 300) {

      startcheck = 1;

      lcd.display();      

    }

  }

 

  lcd.clear();

 

  while (analogRead(sensorPin1) > 300) {

    timerset = timerset + 5000;

    lcd.setCursor(0, 0);  

    lcd.print(timerset/1000);

    lcd.setCursor(0, 1);  

    lcd.print(" seconds");

    delay(500);

    lcd.clear();

    Serial.println(timerset);

  }

 

  lcd.setCursor(0, 0);  

  lcd.print(timerset/1000);

  lcd.print(" seconds");

  lcd.setCursor(0, 1);  

  lcd.print("press 2 to GO!");

 

  while (analogRead(sensorPin2) < 300) {

  }

 

  while (timerset > 0) {

    timerset = timerset - 1000;

    lcd.clear();

    lcd.setCursor(0, 0); 

    lcd.print("Countdown:");

    lcd.setCursor(0, 1); 

    lcd.print(timerset/1000); 

    lcd.print(" seconds");

    delay(1000);

  }

 

  lcd.clear();

  lcd.setCursor(0, 0); 

  lcd.print("Time's Up!");

 

  for (int thisNote = 0; thisNote < 8; thisNote++) {

    // to calculate the note duration, take one second 

    // divided by the note type.

    //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.

    int noteDuration = 1000/noteDurations[thisNote];

    tone(8, melody[thisNote],noteDuration);

    // to distinguish the notes, set a minimum time between them.

    // the note's duration + 30% seems to work well:

    int pauseBetweenNotes = noteDuration * 1.30;

    delay(pauseBetweenNotes);

    // stop the tone playing:

    noTone(8);

  }

 

  lcd.clear();

  lcd.setCursor(0, 0); 

  lcd.print("Time's Up!");

  lcd.setCursor(0, 1); 

  lcd.print("Press 2 to Reset");

  while (analogRead(sensorPin2) < 300) {

    lcd.display();

  }

  lcd.clear();

  startcheck = 0;

  timerset = 0;

  lcd.setCursor(0, 0); 

  lcd.print("<- Squeeze 1 to");

  lcd.setCursor(0, 1); 

  lcd.print("set timer");

}