Description

Makes it so the LEDs get brighter on command, so you can enter in 'rrr' 'rrbb' etc to make each LED brighter.

Components Used

Arduino Diecimila
3 LEDS (1 red, 1 blue, 1 green)
3 resistors

Arduino Code

//*
* Serial RGB LED - extended
* ---------------
* 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
*
* OR
* Command structure is "<colorCode><colorCode>...<colorCode>", where "colorCode" is
* one of "r","g",or "b" and you can enter many at once to increase brightness
* E.g. "rr" turns the red LED up 20%.
* "rrgg" turns the red LED up 20% and the green LED up 20%
* "bggr" turns the blue LED to 1/4 brightness
*
* OR
* Command structure is "<colorName>", where "colorName" is "purple" or "pink"
* This sets the red LED, blue LED and green LED to the appropriate numbers.
*
*
* Created 13 September
*
* Shawna Hein
*
* extended version of Serial LED
* copyleft 2006 Tod E. Kurt <tod@todbot.com
* http://todbot.com/
*/

//include support for manipulating strings.
#include <stdio.h>
#include <string.h>

int MAXSIZE = 30;
char serInString[30]; // 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 redVal, greenVal, blueVal;

int redPin = 11; // Red LED, connected to digital pin 9
int greenPin = 10; // Green LED, connected to digital pin 10
int bluePin = 9; // 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);
redVal = 127;
greenVal = 127;
blueVal = 127;
analogWrite(redPin, redVal); // set them all to mid brightness
analogWrite(greenPin, greenVal); // set them all to mid brightness
analogWrite(bluePin, blueVal); // set them all to mid brightness
Serial.println("enter color command (e.g. 'r130','rrrbb', or 'purple') :");
}

void loop() {
readSerialString(serInString);
//processNumericalCommands(serInString);
processRepeats(serInString);
//processColorNames(serInString);
resetSerialString(serInString);
}

//change the value of the red, green, or blue LED according to the command received.
//for example, r240 sets the red LED to the value 240 (out of 255)
void processNumericalCommands(char *strArray) {
//read in the first character in the string
colorCode = serInString[0];

//if the first character is r (red), g (green) or b (blue), do the following...
if( colorCode == 'r' || colorCode == 'g' || colorCode == 'b' ) {
//convert the string to an integer
//(start at the second character, or the beginning of the string '+1')
colorVal = atoi(serInString+1);
Serial.print("setting color ");
Serial.print(colorCode);
Serial.print(" to ");
Serial.print(colorVal);
Serial.println();

if(colorCode == 'r')
analogWrite(redPin, colorVal);
else if(colorCode == 'g')
analogWrite(greenPin, colorVal);
else if(colorCode == 'b')
analogWrite(bluePin, colorVal);
}
}

//change the value of the red, green, or blue LED according to the command received.
//for example, rrr raises the red LED by 30%, bg raises the blue by 10 and the green by 10
void processRepeats(char *strArray){
int i = 0;
while (strArray[i] != '\0' && i<MAXSIZE) {
colorCode = strArray[i];

if(colorCode == 'r'){
redVal = (redVal+10) % 255;
if(redVal>255){
redVal=0;
}
Serial.print("Incrementing Red Value to ");
Serial.print(redVal);
analogWrite(redPin, redVal);
}
else if(colorCode == 'b'){
blueVal = (blueVal+10) % 255;
if(blueVal>255){
blueVal=0;
}
Serial.print("Incrementing Blue Value to ");
Serial.print(blueVal);
analogWrite(bluePin, blueVal);
}
else if(colorCode == 'g'){
greenVal = (greenVal+10) % 255;
if(greenVal>255){
greenVal=0;
}
Serial.print("Incrementing Green Value to ");
Serial.print(greenVal);
analogWrite(greenPin, greenVal);
}
else{
Serial.print("This is an invalid letter");
}
i++;
}
}

//change the value of the red, green, or blue LED according to the command received.
//for example, purple sets the LED to appropriate numbers
//
//**NOTE
this isnt working right now and i have spent hours trying to figure out
why... it reads in the color name fine but stringsEqual doesn't work
//.. maybe string.h isn't being included somehow?? some input would help**
//
void processColorNames(char *strArray){
int i=0;
while (strArray[i] != '\0' && i<MAXSIZE) {
Serial.print(strArray[i]);
i++;
}
if (stringsEqual(strArray,"purple", 6)) {
analogWrite(redPin, 160);
analogWrite(greenPin, 32);
analogWrite(bluePin, 240);
Serial.print("Switching to Purple");
}
else if (stringsEqual(strArray,"pink",4)) {
analogWrite(redPin, 255);
analogWrite(greenPin, 20);
analogWrite(bluePin, 157);
Serial.print("Switching to Pink");
}
}

//compare two strings to see if they are equal
//compares the first 'numCharacters' characters of string1 and string2 to
//see if they are the same
//
//E.g. stringsEqual("hello","hello",5) => true
// stringsEqual("hello","helaabbnn",3) => true
// stringsEqual("hello","helaa",5) => false
boolean stringsEqual(char *string1, char *string2, int numCharacters) {
if (strncmp(string1, string2, numCharacters) == 0) {
return true;
} else {
return false;
}
}

void resetSerialString (char *strArray) {
for (int i = 0; i < MAXSIZE; i++) {
strArray[i] = '\0';
}
}

//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++;
}
}

Item

Here is my circuit with an Eggshell (Note these are thumbnails, click on them to get a larger view).

LEDs with eggshell

Here is my circuit with a Beach Shell (Note these are thumbnails, click on them to get a larger view).

LEDS with Shell