/* * Serial RGB LED * --------------- * Serial commands control the brightness of R,G,B LEDs * * Command structure is "", 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 * * Alternate command structure is "*", where "colorCode" is * one of "r","g", or "b". * E.g. "r" increases the red LED brightness by 10 * "rrr" increases the red LED brightness by 30 * "ggb" increases the green LED brightness by 20 and the blue by 10 * * Created 18 October 2006 * copyleft 2006 Tod E. Kurt * * Adapted 12 Sep 2007 * Copylefted Srikanth Narayan * Fixed strInString bug, added function processStatusChangeCommands * */ //include support for manipulating strings. //for a useful string comparison function, see the bottom of this file... stringsEqual() #include #include 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 int redValue = 127; int greenValue = 127; int blueValue = 127; void setup() { pinMode(redPin, OUTPUT); // sets the pins as output pinMode(greenPin, OUTPUT); pinMode(bluePin, OUTPUT); Serial.begin(9600); analogWrite(redPin, redValue); // set them all to mid brightness analogWrite(greenPin, greenValue); // set them all to mid brightness analogWrite(bluePin, blueValue); // set them all to mid brightness Serial.println("enter color command (e.g. 'r43 or rrrrrrrrbbbb') :"); } void loop () { //read the serial port and create a string out of what you read readSerialString(serInString, 100); //Uncomment the following line to read commands of the form 'r245' or 'b3' //processNumericalCommands(serInString); //Uncomment the following line to read commands of the form 'rrrb' processRepeatKeyCommands(serInString, 100); //Read commands to change the 'real life availability status' processStatusChangeCommands(serInString, 100); //Erase anything left in the serial string, preparing it for the //next loop resetSerialString(serInString, 100); delay(100); // wait a bit, for serial data } void resetSerialString (char *strArray, int length) { for (int i = 0; i < length; 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 maxLength) { int i = 0; if(!Serial.available()) { return; } while (Serial.available() && i < maxLength) { strArray[i] = Serial.read(); i++; } } //go through the string, and increase the red value for each 'r', //the green value for each 'g', and the blue value for each 'b'. //For example "rrrg" increases red by 30 and green by 10. void processRepeatKeyCommands(char *strArray, int maxLength) { int i = 0; //loop through the string (strArray) //i = the current position in the string //Stop when either (a) i reaches the end of the string or // (b) there is an empty character '\0' in the string while (i < maxLength && strArray[i] != '\0') { //Read in the character at position i in the string colorCode = strArray[i]; //If the character is r (red)... if (colorCode == 'r') { //Increase the current red value by 10, and if you reach 255 go back to 0 redValue = (redValue + 10) % 255; analogWrite(redPin, redValue); Serial.print("setting color r to "); Serial.println(redValue); //If the character is g (green)... } else if (colorCode == 'g') { greenValue = (greenValue + 10) % 255; analogWrite(greenPin, greenValue); Serial.print("setting color g to "); Serial.println(greenValue); //If the character is b (blue)... } else if (colorCode == 'b') { blueValue = (blueValue + 10) % 255; analogWrite(bluePin, blueValue); Serial.print("setting color b to "); Serial.println(blueValue); } //Move on to the next character in the string //From here, the code continues executing from the "while" line above... i++; } } /* Parse the string for accepted commands: 'Available' : G - 255 , R - 0, B - 0 'Busy' : G - 0 , R - 255 , B - 0 'Away' : G - 127 , R - 179 , B - 0 */ void processStatusChangeCommands(char *strArray, int maxLength) { if(stringsEqual(strArray, "set away", 8)) { //validCommand = true; //Change color to Orange greenValue = 25; blueValue = 0; redValue = 199; analogWrite(greenPin, greenValue); analogWrite(bluePin, blueValue); analogWrite(redPin, redValue); Serial.print("Availability change successful!"); } else if(stringsEqual(strArray, "set busy", 8)) { //validCommand = true; //Change color to red greenValue = 0; blueValue = 0; redValue = 255; analogWrite(greenPin, greenValue); analogWrite(bluePin, blueValue); analogWrite(redPin, redValue); Serial.print("Availability change successful!"); } else if(stringsEqual(strArray, "set available", 13)) { //validCommand = true; // Change color to green greenValue = 255; blueValue = 0; redValue = 0; analogWrite(greenPin, greenValue); analogWrite(bluePin, blueValue); analogWrite(redPin, redValue); Serial.print("Availability change successful!"); } } //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 = strArray[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(strArray+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); } } //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; } }