Red Green Blue LEDs with Color Picker Mouse Interface
Description
- Design a diffuser for LEDs
- Play with keyboard input or other to control 3 LEDs (red, green, blue)
Components Used
Diffuser: A muffin cup and a glass bowl.
LEDs: red, green and blue!
220 ohm resistors
Extra Fun
Prayag and I worked together to create a Color Picker GUI which allows a user to select a color from a color palette of RGB values which then gets sent over the serial port to the arduino.
Arduino Code
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The multiple key press code:
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/*
* Multiple key press code
* Iris Cheung
*/
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 numLetters;
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);
colorVal = numLetters*0.1*255;
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++;
}
numLetters = i;
Serial.print("numLetters:");
Serial.print(numLetters);
}
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The Color Picker Code
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Just uses the serial code provided in assignment 2!
See the attached file for the python code used for creating the Color Picker GUI.
