Description
I chose option 1 but worked with 3 LEDs and added photocells to control the variation of each color. The 2 potentiometers still control the blinking frequency and the total brightness of all 3 LEDs. But when a photocell is covered, it decreases the corresponding LED value. The calculation was performed by mapping the photocell value from its Max and Min (measured manually) to a range from 0 to the total brightness value provided by the potentiometer.
Video Demo
A possible issue of this setting is that the ambient light is not consistent so a fine tune may be required for it to show the best result. However, the demo video was taken in a different lighting then the testing environment and it turned out ok.
Components
1 x Arduino UNO Board
3 x LED lights (1 red, 1 blue, 1 green) with 3 x 220-ohm resistors
1 x bottle cap
2 x Potentiometers
3 x photocells with 3 x 10KΩ resistors
Code
const int potBrightPin = 0; // select the input pin for the potentiometer 1
const int potFreqPin = 1; // select the input pin for the potentiometer 2
int brightVal = 0; // variable to store the value coming from pot 1
int freqVal = 0; // variable to store the value coming from pot 2
const int led1Pin = 9; // select the pin for the LED 1
const int led2Pin = 10; // select the pin for the LED 2
const int led3Pin = 11; // select the pin for the LED 2
const int xpin = 2; // x-axis of the accelerometer
const int ypin = 3; // y-axis
const int zpin = 4; // z-axis
const int xMax = 382;
const int yMax = 663;
const int zMax = 848;
const int xMin = 68;
const int yMin = 175;
const int zMin = 346;
int xVal = 0;
int yVal = 0;
int zVal = 0;
void setup() {
pinMode(led1Pin, OUTPUT); // declare the led1Pin as an OUTPUT
pinMode(led2Pin, OUTPUT); // declare the led2Pin as an OUTPUT
pinMode(led3Pin, OUTPUT); // declare the led2Pin as an OUTPUT
Serial.begin(9600);
}
void loop() {
brightVal = analogRead(potBrightPin); // read the value from pot 1, between 0 - 1024, for dimming
freqVal = analogRead(potFreqPin); // read the value from pot 2, between 0 - 1024, for blinking
xVal = analogRead(xpin);
yVal = analogRead(ypin);
zVal = analogRead(zpin);
Serial.print(xVal);
Serial.print(", ");
Serial.print(yVal);
Serial.print(", ");
Serial.print(zVal);
Serial.println();
// Serial.print("Bright: ");
// Serial.println(brightVal/4);
// Serial.print("Freq: ");
// Serial.println(freqVal);
setLEDon(xVal, yVal, zVal, brightVal/4);
delay(freqVal); // stop the program for some time, meaning, LED is on for this time
setLEDoff();
delay(freqVal); // stop the program for some time, meaning, LED is OFF for this time
}
void setLEDon(int x, int y, int z, int bright) {
Serial.print("Bright: ");
Serial.println(bright);
//to fine tune color
x = map(x, xMin, xMax, 0, bright);
y = map(y, yMin, yMax, 0, bright);
z = map(z, zMin, zMax, 0, bright);
// calibrate since the LED brightness is not consistant
x = x * 1;
y = y*0.7;
z = z*0.5;
x = constrain(x, 0, 255);
y = constrain(y, 0, 255);
z = constrain(z, 0, 255);
Serial.print("After adjustment: ");
Serial.println();
Serial.print(x);
Serial.print(", ");
Serial.print(y);
Serial.print(", ");
Serial.print(z);
Serial.println();
Serial.println();
analogWrite(led1Pin, x);
analogWrite(led2Pin, y);
analogWrite(led3Pin, z);
}
void setLEDoff() {
analogWrite(led1Pin, 0);
analogWrite(led2Pin, 0);
analogWrite(led3Pin, 0);
}
