Faded!

Using three potentiometers to change an LED's brightness.

Aug 13, 2018

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light

Components and supplies

Breadboard (generic)

RGB Diffused Common Anode

Jumper wires (generic)

Resistor 1k ohm

Single Turn Potentiometer- 10k ohms

Project description

Code

arduino

We used this code, but the color of the light bulb wouldn't change, only the brightness. Credits to: http://www.silvinopresa.com/how-to/arduino/rgb-led-common-annode-controlled-by-potentiometers-and-arduino/

1int redPin = 9; //Pin for the red RGB led pin
2int greenPin = 10; //Pin   for the green RGB led pin
3int bluePin = 11; //Pin for the blue RGB led pin
4
5int   potPin_red = A0;  //declare pin for the potentiometer for the red LED
6int potPin_green   = A1;  //declare pin for the potentiometer for the green LED
7int potPin_blue   = A2;  //declare pin for the potentiometer for the blue LED
8
9int readValue_red;   //declare variable to store the read value from the potentiometer which controls   the red LED
10int readValue_green; //declare variable to store the read value from   the potentiometer which controls the green LED
11int readValue_blue; //declare   variable to store the read value from the potentiometer which controls the blue   LED
12
13int writeValue_red; //declare variable to send to the red LED
14int   writeValue_green; //declare variable to send to the green LED
15int writeValue_blue;   //declare variable to send to the blue LED
16
17void setup() {
18  pinMode(potPin_red,   INPUT); //set potentiometer for red LED as input
19  pinMode(potPin_green, INPUT);   //set potentiometer for green LED as input
20  pinMode(potPin_blue, INPUT); //set   potentiometer for blue LED as input
21  
22  pinMode(redPin,OUTPUT); //set pin   for red LED as output
23  pinMode(bluePin,OUTPUT); //set pin for green LED as output
24   pinMode(greenPin, OUTPUT); //set pin for blue LED as output
25}
26
27void loop()   {
28  readValue_red = analogRead(potPin_red); //Read voltage from potentiometer   to control red LED
29  readValue_green = analogRead(potPin_green); //Read voltage   from potentiometer to control green LED
30  readValue_blue = analogRead(potPin_blue);   //Read voltage from potentiometer to control blue LED
31  
32  writeValue_red   = (255./1023.)*readValue_red; //Calculate the value to write on the red LED (add   point to change to float point)
33  writeValue_green = (255./1023.)*readValue_green;   //Calculate the value to write on the green LED
34  writeValue_blue = (255./1023.)*readValue_blue;   ///Calculate the value to write on the blue LED
35  
36  analogWrite(redPin,writeValue_red);   //write value to set the brightness of the red LED
37  analogWrite(greenPin,writeValue_green);   //write value to set the brightness of the green LED
38  analogWrite(bluePin,writeValue_blue);   //write value to set the brightness of the blue LED
39}

int redPin = 9; //Pin for the red RGB led pin
int greenPin = 10; //Pin   for the green RGB led pin
int bluePin = 11; //Pin for the blue RGB led pin

int   potPin_red = A0;  //declare pin for the potentiometer for the red LED
int potPin_green   = A1;  //declare pin for the potentiometer for the green LED
int potPin_blue   = A2;  //declare pin for the potentiometer for the blue LED

int readValue_red;   //declare variable to store the read value from the potentiometer which controls   the red LED
int readValue_green; //declare variable to store the read value from   the potentiometer which controls the green LED
int readValue_blue; //declare   variable to store the read value from the potentiometer which controls the blue   LED

int writeValue_red; //declare variable to send to the red LED
int   writeValue_green; //declare variable to send to the green LED
int writeValue_blue;   //declare variable to send to the blue LED

void setup() {
  pinMode(potPin_red,   INPUT); //set potentiometer for red LED as input
  pinMode(potPin_green, INPUT);   //set potentiometer for green LED as input
  pinMode(potPin_blue, INPUT); //set   potentiometer for blue LED as input
  
  pinMode(redPin,OUTPUT); //set pin   for red LED as output
  pinMode(bluePin,OUTPUT); //set pin for green LED as output
   pinMode(greenPin, OUTPUT); //set pin for blue LED as output
}

void loop()   {
  readValue_red = analogRead(potPin_red); //Read voltage from potentiometer   to control red LED
  readValue_green = analogRead(potPin_green); //Read voltage   from potentiometer to control green LED
  readValue_blue = analogRead(potPin_blue);   //Read voltage from potentiometer to control blue LED
  
  writeValue_red   = (255./1023.)*readValue_red; //Calculate the value to write on the red LED (add   point to change to float point)
  writeValue_green = (255./1023.)*readValue_green;   //Calculate the value to write on the green LED
  writeValue_blue = (255./1023.)*readValue_blue;   ///Calculate the value to write on the blue LED
  
  analogWrite(redPin,writeValue_red);   //write value to set the brightness of the red LED
  analogWrite(greenPin,writeValue_green);   //write value to set the brightness of the green LED
  analogWrite(bluePin,writeValue_blue);   //write value to set the brightness of the blue LED
}

Code

arduino

1int redPin = 9; //Pin for the red RGB led pin
2int greenPin = 10; //Pin  for the green RGB led pin
3int bluePin = 11; //Pin for the blue RGB led pin
4
5int  potPin_red = A0;  //declare pin for the potentiometer for the red LED
6int potPin_green  = A1;  //declare pin for the potentiometer for the green LED
7int potPin_blue  = A2;  //declare pin for the potentiometer for the blue LED
8
9int readValue_red;  //declare variable to store the read value from the potentiometer which controls  the red LED
10int readValue_green; //declare variable to store the read value from  the potentiometer which controls the green LED
11int readValue_blue; //declare  variable to store the read value from the potentiometer which controls the blue  LED
12
13int writeValue_red; //declare variable to send to the red LED
14int  writeValue_green; //declare variable to send to the green LED
15int writeValue_blue;  //declare variable to send to the blue LED
16
17void setup() {
18  pinMode(potPin_red,  INPUT); //set potentiometer for red LED as input
19  pinMode(potPin_green, INPUT);  //set potentiometer for green LED as input
20  pinMode(potPin_blue, INPUT); //set  potentiometer for blue LED as input
21  
22  pinMode(redPin,OUTPUT); //set pin  for red LED as output
23  pinMode(bluePin,OUTPUT); //set pin for green LED as output
24  pinMode(greenPin, OUTPUT); //set pin for blue LED as output
25}
26
27void loop()  {
28  readValue_red = analogRead(potPin_red); //Read voltage from potentiometer  to control red LED
29  readValue_green = analogRead(potPin_green); //Read voltage  from potentiometer to control green LED
30  readValue_blue = analogRead(potPin_blue);  //Read voltage from potentiometer to control blue LED
31  
32  writeValue_red  = (255./1023.)*readValue_red; //Calculate the value to write on the red LED (add  point to change to float point)
33  writeValue_green = (255./1023.)*readValue_green;  //Calculate the value to write on the green LED
34  writeValue_blue = (255./1023.)*readValue_blue;  ///Calculate the value to write on the blue LED
35  
36  analogWrite(redPin,writeValue_red);  //write value to set the brightness of the red LED
37  analogWrite(greenPin,writeValue_green);  //write value to set the brightness of the green LED
38  analogWrite(bluePin,writeValue_blue);  //write value to set the brightness of the blue LED
39}

int redPin = 9; //Pin for the red RGB led pin
int greenPin = 10; //Pin  for the green RGB led pin
int bluePin = 11; //Pin for the blue RGB led pin

int  potPin_red = A0;  //declare pin for the potentiometer for the red LED
int potPin_green  = A1;  //declare pin for the potentiometer for the green LED
int potPin_blue  = A2;  //declare pin for the potentiometer for the blue LED

int readValue_red;  //declare variable to store the read value from the potentiometer which controls  the red LED
int readValue_green; //declare variable to store the read value from  the potentiometer which controls the green LED
int readValue_blue; //declare  variable to store the read value from the potentiometer which controls the blue  LED

int writeValue_red; //declare variable to send to the red LED
int  writeValue_green; //declare variable to send to the green LED
int writeValue_blue;  //declare variable to send to the blue LED

void setup() {
  pinMode(potPin_red,  INPUT); //set potentiometer for red LED as input
  pinMode(potPin_green, INPUT);  //set potentiometer for green LED as input
  pinMode(potPin_blue, INPUT); //set  potentiometer for blue LED as input
  
  pinMode(redPin,OUTPUT); //set pin  for red LED as output
  pinMode(bluePin,OUTPUT); //set pin for green LED as output
  pinMode(greenPin, OUTPUT); //set pin for blue LED as output
}

void loop()  {
  readValue_red = analogRead(potPin_red); //Read voltage from potentiometer  to control red LED
  readValue_green = analogRead(potPin_green); //Read voltage  from potentiometer to control green LED
  readValue_blue = analogRead(potPin_blue);  //Read voltage from potentiometer to control blue LED
  
  writeValue_red  = (255./1023.)*readValue_red; //Calculate the value to write on the red LED (add  point to change to float point)
  writeValue_green = (255./1023.)*readValue_green;  //Calculate the value to write on the green LED
  writeValue_blue = (255./1023.)*readValue_blue;  ///Calculate the value to write on the blue LED
  
  analogWrite(redPin,writeValue_red);  //write value to set the brightness of the red LED
  analogWrite(greenPin,writeValue_green);  //write value to set the brightness of the green LED
  analogWrite(bluePin,writeValue_blue);  //write value to set the brightness of the blue LED
}

Downloadable files

Circuit Diagram

We used this digram

Circuit Diagram

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