Part A

a. How would you change the code to make the song play twice as fast?

Make "1000" in "int noteDuration = 1000 / noteDuration[thisNote];" to "500"

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b. What song is playing? ;-)

the Star Wars theme song

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Part B

a. What voltage level do you need to power your display?

4.7 to 5.5 volts

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b. What was one mistake you made when wiring up the display? How did you fix it?

I didn't connect pin 15 to the ground correctly

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c. What line of code do you need to change to make it flash your name instead of "Hello World"?

Replace "Hello World" with "Abby" in "lcd.pring("Hello World");"

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Part C

1. a. Post a copy of your new code in your lab writeup.

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);
}

void loop() {
  // read the value from the sensor:
  sensorValue = analogRead(sensorPin);
  // turn the ledPin on
  digitalWrite(ledPin, HIGH);
  // stop the program for <sensorValue> milliseconds:
  delay(sensorValue);
  // turn the ledPin off:
  digitalWrite(ledPin, LOW);
  // stop the program for for <sensorValue> milliseconds:
  delay(sensorValue);
}

Correct, but It needs to be divided by 4 also because the analog input resolution is 10 bits, and the PWM output is 8 bits. The program will work without that division, although the LED will change value from high to low 4 times over a full potentiometer rotation.

2. a. What resistance do you see with a Multimeter when the sensor is flat? When it is bent?

flat: 8-10 Ohms

bent: 20-50 Ohms

correct but it should be KOhms 

b. What kind of voltages should we expect for the Arduino analog pin based on the sensor resistance?

3 volts

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c. How does the range of the LED's brightness change compared to the potentiometer?

the potentiometer narrows the range of brightness

Correct but for the voltage divider circuit, Vout = Vin * R2 / (R1 + R2), where the flex sensor could be R1 or R2, depending on how you designed the circuit. 

d. Include a copy of your Lowly Multimeter code in your lab write-up.

#include <LiquidCrystal.h>

int sensorPin = A0;
int ledPin = 13;
int sensorValue = 0;
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {

  pinMode(ledPin, OUTPUT);

lcd.begin(16,2);
}

void loop() {
  lcd.setCursor(0, 1);
  sensorValue = analogRead(sensorPin);
  delay(1000);
  lcd.print(sensorValue);

}

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3. a. What resistance values do you see from your force sensor?

there's less resistance when there is less pressure

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b. What kind of relationship does the resistance have as a function of force applied? (e.g., linear?)

at very high and low values the resistance as a function of force is not linear, otherwise it is linear

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c. Include a copy of your FSR thumb wrestling code in your lab write-up.

#include <LiquidCrystal.h>

int sensorPin1 = A0;
int sensorValue1 = 0;
int sensorPin2 = A1;
int sensorValue2 = 0;

void setup() {

  LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
  lcd.begin(16,2);

}

void loop() {

  sensorValue1 = analogRead(sensorPin1);
  sensorValue2 = analogRead(sensorPin2);
  LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

  if(sensorValue2 - sensorValue1 >= 50)
{
  lcd.print("Player 1 Wins");
}

if(sensorValue2 - sensorValue1 <= 50)
{
  lcd.print("Player 2 Wins");
}
else
{
  lcd.print("Tied");
}

}

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Part D

1. a. Make a short video showing how your timer works, and what happens when time is up!

b. Post a link to the Lab 3 Timers Hall of Fame.