Descriptions:

After being able to use 2 and 3 pots to control dimming and blinking speed of three RGB LEDs separately from the Lab 3 last week, I start to consider using one pot to discuss relationship between three LEDs. Thus, I try to use 3 pots controlling dimming, blinking speed, and lighting sequence of three RGB LEDs separately:

Pot 1 for dimming

Pot 2 for Blinking Speed

Pot 3 for Lighting Flow (sequence)

For Pot 3, to make the light “flow” between 3 LED, there are five ranges defined for making the lighting sequence similar to a circle: Blue-Green-Red-Green-Blue. When the Target LED is lighten, the dimming degree and blinking speed could be controlled by Pot 1 and Pot 2. Using higher blinking frequency and lighting strength for the Target LED could make the phenomenon of “Lighting Flow” more clearly.

Components:

3 potentiometer pots, Arduino board, bread board, 3 RGB LEDs, 6 wires

Codes: 

/*
 *Pot 1 for dimming control, Pot 2 for blinking control, and Pot 3 for making lighting flow inbetween three LED
 *modified version of AnalogInput
 *by DojoDave <http://www.0j0.org>
 *http://www.arduino.cc/en/Tutorial/AnalogInput
 */

int pot1Pin = 0;   // select the input pin for the potentiometer 1
int pot2Pin = 1;   // select the input pin for the potentiometer 2
int pot3Pin = 2;   // select the input pin for the potentiometer 3
int pot1Val = 0;   // variable to store the value coming from pot 1
int pot2Val = 0;   // variable to store the value coming from pot 2
int pot3Val = 0;   // variable to store the value coming from pot 3
int TargetLED = 11; // start from Blue LED
int RedPin = 9;   // select the pin for the Red LED
int GreenPin = 10;  // select the pin for the Green LED
int BluePin = 11;  // select the pin for the Blue LED

void setup() {
   Serial.begin(9600);
   pinMode(RedPin, OUTPUT);  // declare the RedPin as an OUTPUT
   pinMode(GreenPin, OUTPUT);  // declare the GreenPin as an OUTPUT
   pinMode(BluePin, OUTPUT);  // declare the BluePin as an OUTPUT
}

void loop() {
   pot1Val = analogRead(pot1Pin);   // read the value from pot 1, between 0 - 1024, for dimming
   pot2Val = analogRead(pot2Pin);   // read the value from pot 2, between 0 - 1024, for blinking
   pot3Val = analogRead(pot3Pin);   // read the value from pot 3, between 0 - 1024, to select output LED
   Serial.println(pot1Val);

  
   //To make the light flow between 3 LED, there are five ranges starting from B-G-R-G-B as smiliar to a circle
   if (pot3Val > 801) TargetLED = 11;       // the range 801 - 1024 is for Green LED        
   else if (pot3Val > 601) TargetLED = 10;  // the range 601 - 800 is for Green LED
   else if (pot3Val > 401) TargetLED = 9;   // the range 401 - 600 is for Red LED
   else if (pot3Val > 201) TargetLED = 10;  // the range 201 - 400 is for Green LED
   else TargetLED = 11;                     // the range 0 - 200 is for Blue LED
  
  
   analogWrite(TargetLED, pot1Val/4);     // light the selected LED
   delay(pot2Val);                  // stop the program for some time, meaning, LED is on for this time
   analogWrite(TargetLED, 0);         // dim LED to completely dark (zero)
   delay(pot2Val);                  // stop the program for some time, meaning, LED is OFF for this time
}