Show the luminosity with coloured LEDs

It's a little and easy project using the photoresistor and LEDs

IntermediateShowcase (no instructions)-60 minutes733

Things used in this project

Hardware components

Arduino Mega 2560

Solderless Breadboard Full Size

5 mm LED: Red

Resistor 220 ohm

Through Hole Resistor, 1 kohm

Elegoo 74hc595 IC

Photo resistor

Male/Male Jumper Wires

Software apps and online services

Arduino IDE

Story

History:

I wanted to do a simple project using a photoresistor and LEDs.

That gave me the idea of this project. It uses the photocell to turn on LEDs.

The project:

I started to think of a little circuit but it didn't work so I included the 74HC595 monitor. (It only costs a few euros.)

Module 74HC595

This module add pins to the AtMega or Arduino Uno because you can use nearly all types of Arduino boards. It's useful when you need pins which aren't present on your card.

I used it to command all the LEDs. It can also be used in a lot of ways.

Afterwards, I did the program. I had to do some research to know how to code the module but finally, I did it.

And that's how I made this project.

P.S. :If you want more informations, please ask me in the comments and explain it. And please respect my project.

Thanks!

Code

Photocell.ino

int lightPin = 0;
int latchPin = 11;
int clockPin = 9;
int dataPin = 12;

int leds = 0;

void setup() 
{
  pinMode(latchPin, OUTPUT);
  pinMode(dataPin, OUTPUT);  
  pinMode(clockPin, OUTPUT);
}
void updateShiftRegister()
{
   digitalWrite(latchPin, LOW);
   shiftOut(dataPin, clockPin, LSBFIRST, leds);
   digitalWrite(latchPin, HIGH);
}
void loop() 
{
  int reading  = analogRead(lightPin);
  int numLEDSLit = reading / 57;
  if (numLEDSLit > 8) numLEDSLit = 8;
  leds = 0; 
  for (int i = 0; i < numLEDSLit; i++)
  {
    leds = leds + (1 << i); 
  }
  updateShiftRegister();
}

Credits

Paxlo_05

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Show the luminosity with coloured LEDs