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Report - Lab 3

Page history last edited by Benjamin Tee 11 years, 8 months ago

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

Change the 1.30 to 0.65 in the line:

int pauseBetweenNotes = noteDuration * 1.30;

✓

b. What song is playing? ;-)

star wars theme song✓

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 miss two pins in the LCD, so to correct it I just recheck the connections and connect it again.

✓

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

lcd.print("Javier, Flores")

✓

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

int sensorPin = 21; // select the input pin for the potentiometer

int ledPin = 9; // 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);

pinMode(sensorPin, INPUT);

}

void loop() {

// read the value from the sensor:

sensorValue = analogRead(sensorPin);

sensorValue = map(sensorValue, 0, 1025, 0, 255);

// turn the ledPin on

analogWrite(ledPin, sensorValue);

}

✓

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

8.2 kOhms when flat

7.8 kOhms when bent in

19.0 kOhms when bent out

✓

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

Since I'm working with 3.3 V

It will vary from 1.77 V to 2.44 V

✓

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

The brightness change is in a smaller range (with the same code).

✓

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

#include <LiquidCrystal.h>

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

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

float sensorValue = 0;

int sensorPin = 21;

void setup() {

pinMode(sensorPin, INPUT);

// set up the LCD's number of columns and rows:

lcd.begin(16, 2);

}

void loop() {

// set the cursor to column 0, line 1

// (note: line 1 is the second row, since counting begins with 0):

lcd.setCursor(0, 1);

int sensorValue = analogRead(sensorPin);

sensorValue = map(sensorValue, 0, 1025, 0, 1);

lcd.print(sensorValue * 3.3);

}✓

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

The resistance decreases from infinite +(when no force is applied) to the 350 ohms.

✓

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

Logarithmic

✓

c. 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 sensorPin = A0;
int sensorValue = 0;

int sensorPin2 = A1;
int sensorValue2 = 0;

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

void loop() {

// read the value from the sensor:

sensorValue = analogRead(sensorPin);

sensorValue2 = analogRead(sensorPin2);

lcd.setCursor(0, 0);

lcd.print(sensorValue, DEC);

lcd.print(" vs ");
lcd.print(sensorValue2, DEC);

lcd.setCursor(0, 1);

if (sensorValue<sensorValue2)
lcd.print("Player 2 is winning!");
else
lcd.print("Player 1 is winning!");

delay(500);
}

✓

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.

//code

#include "pitches.h"
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int sensorValue;
int intTime = 5;
int startTime = 0;
int sensorPin = A1;

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

void loop() {
   sensorValue = analogRead(sensorPin);
   if (sensorValue > 500) {
      startTime = millis();
      while (1){
        int elapsed = (millis() - startTime)/1000;

        lcd.setCursor(0, 1);
        lcd.print(intTime - elapsed,DEC);
        if (intTime - elapsed < 1) {
          for (int i = 0 ; i < 3; i++){
            tone(8, 440, 200);
            delay(400);
          }
          break;
        }
      }
   }
}