Show the luminosity with coloured LEDs

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

Feb 14, 2020

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environmental sensing

lights

home automation

Components and supplies

5 mm LED: Red

Resistor 220 ohm

Male/Male Jumper Wires

Through Hole Resistor, 1 kohm

Photo resistor

Arduino Mega 2560

74hc595 IC

Solderless Breadboard Full Size

Apps and platforms

Arduino IDE

Project description

Code

Photocell.ino

arduino

It's the program to run the project. It small and easy to redo if you can not download it.

1
2
3int lightPin = 0;
4int latchPin = 11;
5int clockPin = 9;
6int  dataPin = 12;
7
8int leds = 0;
9
10void setup() 
11{
12  pinMode(latchPin,  OUTPUT);
13  pinMode(dataPin, OUTPUT);  
14  pinMode(clockPin, OUTPUT);
15}
16void  updateShiftRegister()
17{
18   digitalWrite(latchPin, LOW);
19   shiftOut(dataPin,  clockPin, LSBFIRST, leds);
20   digitalWrite(latchPin, HIGH);
21}
22void loop()  
23{
24  int reading  = analogRead(lightPin);
25  int numLEDSLit = reading /  57;
26  if (numLEDSLit > 8) numLEDSLit = 8;
27  leds = 0; 
28  for (int i = 0;  i < numLEDSLit; i++)
29  {
30    leds = leds + (1 << i); 
31  }
32  updateShiftRegister();
33}
34
35
36


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();
}

Downloadable files

photocell_2_xdRu1yPzZc.png

photocell_1

photocell_2_xdRu1yPzZc.png

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laurebayfield

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