Lab 2 - RGB control + Diffuser
The code below will control red, green, and blue LEDs. For every letter 'r', 'g', or 'b' the intensity of corresponding LED will increase by 10%. If the value goes over 255, the brightness will be reset to 0.
There is also an OFF command 'o', which turns all LEDs off.
CODE:
#include <stdio.h>
#include <string.h>
char serInString[100]; // array that will hold the different bytes of the string. 100=100characters;
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 = 0;
int greenValue = 0;
int blueValue = 0;
void setup() {
pinMode(redPin, OUTPUT); // sets the pins as output
pinMode(greenPin, OUTPUT);
pinMode(bluePin, OUTPUT);
Serial.begin(9600);
analogWrite(redPin, redValue);
analogWrite(greenPin, greenValue);
analogWrite(bluePin, blueValue);
Serial.println("enter color command:");
}
void loop () {
//read the serial port and create a string out of what you read
readSerialString(serInString, 100);
//Function
processRepeatKeyCommands(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 = serInString[i];
//If the character is r (red) increase 10 % for every letter. If over 225, reset to 0.
if (colorCode == 'r') {
if (redValue > 225) {
redValue = 0;
}
redValue = redValue + 25;
analogWrite(redPin, redValue);
Serial.print("setting color r to ");
Serial.println(redValue);
//If the character is g (green) increase 10 % for every letter. If over 225, reset to 0.
} else if (colorCode == 'g') {
if (greenValue > 225) {
greenValue = 0;
}
greenValue = greenValue + 25;
analogWrite(greenPin, greenValue);
Serial.print("setting color g to ");
Serial.println(greenValue);
//If the character is b (blue) increase 10 % for every letter. If over 225, reset to 0.
} else if (colorCode == 'b') {
if (blueValue > 225) {
blueValue = 0;
}
blueValue = blueValue + 25;
analogWrite(bluePin, blueValue);
Serial.print("setting color b to ");
Serial.println(blueValue);
//If the character is o (off), turn all LEDs off.
} else if (colorCode == 'o') {
redValue = 0;
greenValue = 0;
blueValue = 0;
analogWrite(redPin, redValue);
analogWrite(greenPin, greenValue);
analogWrite(bluePin, blueValue);
Serial.print("setting all LEDs to OFF ");
}
//Move on to the next character in the string
//From here, the code continues executing from the "while" line above...
i++;
}
}
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