Lab_3 Report

PART A

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

int noteDuration = 500/noteDurations[thisNote];

✓

b. What song is playing? ;-)

Star Wars✓

 

PART B

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

5V✓

 

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

I thought it wasn't working because I couldn't see but then I noticed that it was very dim and it was working well.

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

lcd.print("Edgar");

 

PART C

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

int sensorPin = A0;  
int ledPin = 9;     
int sensorValue = 0; 

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

 

void loop() {
  sensorValue = analogRead(sensorPin);
  sensorValue = sensorValue/4; 
  analogWrite(ledPin, sensorValue);                        
}

✓

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

9.8K when is flat and 20.1K when is bent

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2b. What kind of voltages should we expect for the Teensy analog pin based on the sensor resistance?

Using 3.3V and the sensor flat -> Vout = 22k/(9.8k+22k)*3.3V = 2.28V

Using 3.3V and the sensor bent -> Vout = 22k/(20.1k+22k)*3.3V = 1.72V

 

Using 5V and the sensor flat -> Vout = 22k/(9.8k+22k)*5V = 3.45V

Using 5V and the sensor bent -> Vout = 22k/(20.1k+22k)*5V = 2.61V

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2c. How does the range of the LED's brightness change compared to the potentiometer?

It doesn't change because we have a higher resistance than 10K in the sensor

Not quite. The LED brightness will change as the resistance range is not the same.

Try doing a calculation.

 

2d. Include a copy of your Lowly Multimeter code in your lab write-up.

#include <LiquidCrystal.h>

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

int sensorPin = A0;  
int ledPin = 9;     
int sensorValue = 0;
double outputValue = 0;

void setup() {
  pinMode(ledPin, OUTPUT);
  lcd.begin(16, 2);  
}

void loop() {
  sensorValue = analogRead(sensorPin); //read sensor
  outputValue = (double)sensorValue*5/1023; //convert sensorValue to voltage
  analogWrite(ledPin, sensorValue);
 
  //print in LCD
  lcd.setCursor(0, 0);
  lcd.print("Output value");
  lcd.setCursor(0, 1);
  lcd.print(outputValue);
}

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

I see changes from M ohms to K ohms, depending on the force applied to the sensor (if more force is applied, the resistance decreases).

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3b. What kind of relationship does the resistance have as a function of force applied? (e.g., linear?)

The resistance is inversely proportional to the force applied e.g., The resistance decreases when the force increases.

✓ Try going deeper and figure out the actual mathematical relationship. Hint: Check the datasheet.

3c. Include a copy of your FSR thumb wrestling code in your lab write-up.

#include <LiquidCrystal.h>

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

int sensorPinLeft = A0;
int sensorPinRight = A1;
int sensorValueLeft = 0;
int sensorValueRight = 0;

void setup() {
  lcd.begin(16, 2);  
}

void loop() {
  sensorValueLeft = analogRead(sensorPinLeft);
  sensorValueRight = analogRead(sensorPinRight);
 
  lcd.clear();
 
  if(sensorValueLeft > sensorValueRight){
    lcd.print("Left winning!");
  }
  if(sensorValueLeft < sensorValueRight){
    lcd.print("Right winning!");
  }
    
}

✓

PART D

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.