Published February 25, 2023

Project 4 Color Changing Lamp

Using a tri color LED and three gel filtered phototransistors, to create a lamp that changes colors depending on outside factors

BeginnerShowcase (no instructions)2 hours63

Things used in this project

Hardware components

Arduino UNO

Breadboard (generic)

LED (generic)

Resistor 10k ohm

Resistor 220 ohm

Story

In this project, we used three phototransistors and a color changing LED, to create a lamp that will change colors. The three photo transistors are used to determine the colors that the LED will be changing into, being Red, Green and Blue. This was a bit more intricate of a circuit as it required using both sides of the circuit board connecting the power from one side to the other. Each Phototransistor has a 10kohm Resistor, and is connected to Analog inputs A0, A1, and A2 on the Arduino itself. The longer prongs of the phototransistors is crossing the board over the middle and is powered from transferring power from one side of the board to the other. Then the LED itself, having 4 prongs, the longest being the ground, will be connected to the arduino digital pins 9, 10, and 11 to bring voltage to the led itself along with 3 220ohm resistors to each of these prongs as well. As for the coding, we assign the analog and digital pins to be constant integers, and added variables to the sensor values being used to fade the led, setting each integer value to 0 for now. In the setup, we begin communication and set the pins to be the output. In the loop, we set to code to read the analog pins as well as code in for sensor readings to appear. The new mapped values are then set to appear with the analogWrite functions for each pin.

DISCLAIMER:

This was recorded during daytime so it was a bit difficult to get a different predominant light than the white, as well as having lost the blue gel filter for the third phototransistor(it was not cooperating and flung away somewhere)

Code

Color Changing Code

const int greenLEDPin = 9;
const int blueLEDPIn = 10;
const int redLEDPin = 11;
const int redSensorPin = A0;
const int greenSensorPin = A1;
const int blueSensorPin = A2;




void setup() {
  Serial.begin(9600);
  pinMode(greenLEDPin, OUTPUT);
  pinMode(redLEDPin, OUTPUT);
  pinMode(blueLEDPin, OUTPUT);

}

void loop()
 {
  redSensorValue = analogRead(redSensorpin);
  delay(5);
  greenSensorValue = analogRead(greenSensorpin);
  delay(5);
  blueSensorValue = analogRead(blueSensorpin);
  delay(5);
  //reads value of each sensor.
Serial.Print("Raw Sensor \t red: ");
Serial.Print(redSensorValue);
Serial.Print("\t green  ");
Serial.Print(greenSensorValue);
Serial.Print("\t blue  ");
Serial.Print(blueSensorValue);
redValue = redSensorValue/4;
greenValue = greenSensorValue/4;
blueValue = blueSensorValue/4;

Serial.Print("Mapped Sensor values \t");
Serial.Print(redValue);
Serial.Print("\t Green");
Serial.Print(greenValue);
Serial.Print("\t Blue");
Serial.Print(blueValue);
//report and print calculated LED levels
analogWrite(redLEDPin, redValue);
analogWrite(greenLEDPin, greenValue);
analogWrite(blueLEDPin, blueValue);
//Set LED light levels

}

Credits

Luis Estades

13 projects • 1 follower

Project 4 Color Changing Lamp

Things used in this project

Hardware components

Story

Schematics

Fritzing Diagram

Code

Color Changing Code

Credits

Luis Estades

Comments

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Project 4 Color Changing Lamp

Project 4 Color Changing Lamp

Things used in this project

Hardware components

Story

Schematics

Fritzing Diagram

Code

Color Changing Code

Credits

Luis Estades

Comments

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