Lab 2
Lab 2
By Victor Tjhia
Description
- Finding a good diffuser for LED
- Increasing LED’s brightness every time pressing a button in keyboard
- Showing certain color after pressing a button in keyboard
Components Used
· 3 Light Emitting Diode (LED) RGB
· Resistor
· Arduino
· Solderless Board
· Plastic cup
· cotton
Arduino Code
1.diffuser code
/*
* Serial RGB LED
* ---------------
* Serial commands control the brightness of R,G,B LEDs
*
* Command structure is "<colorCode><colorVal>", where "colorCode" is
* one of "r","g",or "b" and "colorVal" is a number 0 to 255.
* E.g. "r0" turns the red LED off.
* "g127" turns the green LED to half brightness
* "b64" turns the blue LED to 1/4 brightness
*
* Created 18 October 2006
* copyleft 2006 Tod E. Kurt <tod@todbot.com
*/
char serInString[100]; // array that will hold the different bytes of the string. 100=100characters;
// -> you must state how long the array will be else it won't work properly
char colorCode;
int colorVal;
int redPin = 9; // Red LED, connected to digital pin 9
int greenPin = 10; // Green LED, connected to digital pin 10
int bluePin = 11; // Blue LED, connected to digital pin 11
void setup() {
pinMode(redPin, OUTPUT); // sets the pins as output
pinMode(greenPin, OUTPUT);
pinMode(bluePin, OUTPUT);
Serial.begin(9600);
analogWrite(redPin, 127); // set them all to mid brightness
analogWrite(greenPin, 127); // set them all to mid brightness
analogWrite(bluePin, 127); // set them all to mid brightness
Serial.println("enter color command (e.g. 'r43') :");
}
void loop () {
// clear the string
memset(serInString, 0, 100);
//read the serial port and create a string out of what you read
readSerialString(serInString);
colorCode = serInString[0];
if( colorCode == 'r' || colorCode == 'g' || colorCode == 'b' ) {
colorVal = atoi(serInString+1);
Serial.print("setting color ");
Serial.print(colorCode);
Serial.print(" to ");
Serial.print(colorVal);
Serial.println();
serInString[0] = 0; // indicates we've used this string
if(colorCode == 'r')
analogWrite(redPin, colorVal);
else if(colorCode == 'g')
analogWrite(greenPin, colorVal);
else if(colorCode == 'b')
analogWrite(bluePin, colorVal);
}
delay(100); // wait a bit, for serial data
}
//read a string from the serial and store it in an array
//you must supply the array variable
void readSerialString (char *strArray) {
int i = 0;
if(!Serial.available()) {
return;
}
while (Serial.available()) {
strArray[i] = Serial.read();
i++;
}
}
2. increase brightness by keypress
/*
* RGBKeypress
* ---------------
* by Victor Tjhia
* modified from Serial RGB
* every time 'r' or 'g' or 'b' b button in keyboard is pressed, the brightness increase by 10% until it reach maximum (255)
*/
char serInString[100]; // array that will hold the different bytes of the string. 100=100characters;
// -> you must state how long the array will be else it won't work properly
char colorCode;
int redPin = 9; // Red LED, connected to digital pin 9
int greenPin = 10; // Green LED, connected to digital pin 10
int bluePin = 11; // Blue LED, connected to digital pin 11
// initializing color brightness
float redv = 0.0;
float greenv = 0.0;
float bluev = 0.0;
void setup() {
pinMode(redPin, OUTPUT); // sets the pins as output
pinMode(greenPin, OUTPUT);
pinMode(bluePin, OUTPUT);
Serial.begin(9600);
analogWrite(redPin, 0); // set them all to mid brightness
analogWrite(greenPin, 0); // set them all to mid brightness
analogWrite(bluePin, 0); // set them all to mid brightness
Serial.println("enter color command (e.g. 'r') :");
}
void loop () {
// clear the string
memset(serInString, 0, 100);
//read the serial port and create a string out of what you read
readSerialString(serInString);
colorCode = serInString[0];
if( colorCode == 'r' || colorCode == 'g' || colorCode == 'b' ) {
if(colorCode == 'b' && bluev == 255) Serial.print("Color b' brightness already maximum, cannot ");
if(colorCode == 'r' && redv == 255) Serial.print("Color r' brightness already maximum, cannot ");
if(colorCode == 'g' && greenv == 255) Serial.print("Color g' brightness already maximum, cannot ");
Serial.print("increase color ");
Serial.print(colorCode);
Serial.print("'s brightness by 10% ");
// Serial.print(colorVal);
Serial.println();
serInString[0] = 0; // indicates we've used this string
if(colorCode == 'r' && redv < 255)
{
redv += 25.5;
analogWrite(redPin, redv);
}
else if(colorCode == 'g' && greenv < 255)
{
greenv += 25.5;
analogWrite(greenPin, greenv);
}
else if(colorCode == 'b' && bluev < 255)
{
bluev += 25.5;
analogWrite(bluePin, bluev);
}
}
delay(100); // wait a bit, for serial data
}
//read a string from the serial and store it in an array
//you must supply the array variable
void readSerialString (char *strArray) {
int i = 0;
if(!Serial.available()) {
return;
}
while (Serial.available()) {
strArray[i] = Serial.read();
i++;
}
}
3. optional assignment
/*
* Optional assignement
* display color yellow, purple, and orange when user press 'y', 'p', or 'o' respectively
*/
char serInString[100]; // array that will hold the different bytes of the string. 100=100characters;
// -> you must state how long the array will be else it won't work properly
char colorCode;
int colorVal;
int redPin = 9; // Red LED, connected to digital pin 9
int greenPin = 10; // Green LED, connected to digital pin 10
int bluePin = 11; // Blue LED, connected to digital pin 11
void setup() {
pinMode(redPin, OUTPUT); // sets the pins as output
pinMode(greenPin, OUTPUT);
pinMode(bluePin, OUTPUT);
Serial.begin(9600);
analogWrite(redPin, 0); // set them all to mid brightness
analogWrite(greenPin, 0); // set them all to mid brightness
analogWrite(bluePin, 0); // set them all to mid brightness
Serial.println("enter color command (e.g. 'r') :");
}
void loop () {
// clear the string
memset(serInString, 0, 100);
//read the serial port and create a string out of what you read
readSerialString(serInString);
colorCode = serInString[0];
if( colorCode == 'r' || colorCode == 'g' || colorCode == 'b' || colorCode == 'o' || colorCode == 'y' || colorCode == 'p' ) {
Serial.print("Displaying color ");
Serial.print(colorCode);
Serial.println();
serInString[0] = 0; // indicates we've used this string
if(colorCode == 'r')
{
analogWrite(redPin, 255);
analogWrite(greenPin, 0);
analogWrite(bluePin, 0);
}
else if(colorCode == 'g')
{
analogWrite(greenPin, 255);
analogWrite(bluePin, 0);
analogWrite(redPin, 0);
}
else if(colorCode == 'b')
{
analogWrite(bluePin, 255);
analogWrite(greenPin, 0);
analogWrite(redPin, 0);
}
if(colorCode == 'o')
{
analogWrite(redPin, 200);
analogWrite(greenPin, 30);
analogWrite(bluePin, 0);
}
if(colorCode == 'y')
{
analogWrite(redPin, 250);
analogWrite(greenPin, 250);
analogWrite(bluePin, 0);
}
if(colorCode == 'p')
{
analogWrite(redPin, 127.5);
analogWrite(greenPin, 0);
analogWrite(bluePin, 127.5);
}
}
delay(100); // wait a bit, for serial data
}
//read a string from the serial and store it in an array
//you must supply the array variable
void readSerialString (char *strArray) {
int i = 0;
if(!Serial.available()) {
return;
}
while (Serial.available()) {
strArray[i] = Serial.read();
i++;
}
}
- Login to post comments
