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29. Sensing the colour of light using photoresistor

Hello friends!

Today I will teach you how to make your Arduino microcontroller sense the colour of light shown on the LDR. Let me give you a glimpse of this project.




As you may have studied in Physics, the intensity of light is inversely proportional to the square of the distance from light source. The intensity of light affects the output voltage of the LDR (or
photoresistor). For this reason, all the LEDs were held at the same distance away from the surface of the LDR to make this project fair. First, the analog values produced by the LDR for each colour were measured with a delay period of 5 seconds. I collected 30 readings for each colour to improve the accuracy. Then I calculated the range and used them in this project's sketch. 
Now, let me explain you how this project works. When the Blue light is shone on the LDR's surface, the intensity of light falls within my calculated range and the Blue LED lights up. The OLED display shows you the colour of the light shone on the LDR's surface and the analog value produced by the photoresistor.

Supplies

  • Arduino Nano
  • Type A to mini B USB cable
  • Solderless Breadboard
  • 0.96" OLED display module - featuring 128 x 64 pixels
  • Photoresistor module
  • 3.3 V lithium battery
  • LEDs (x8) - 2 of each Blue, Yellow, Green and Red
  • Resistors (x4) - 220 Ω
  • Male-to-male jumper wires (x21) - 10 cm
  • 3 pin Female-to-female jumper wires (x3) - 70 cm

Setup

Your setup must look somewhat similar to the one in the image above.

Connections


Photoresistor
  • (+) - 5V
  • (-) - Ground (GND)
  • S - A0
OLED display module
  • GND - Ground
  • VCC - 5V
  • D0 - D10
  • D1 - D9
  • RES (Reset) - D13
  • DC - D11
  • CS - D12
LEDs
  • Cathode (-) - Ground (GND)
  • Blue - D3
  • Yellow - D4
  • Green - D5
  • Red - D6

Coding

For this project, you will be needing the U8glib by Oliver. If you are unsure about the how to use and code for the OLED display module, please refer to https://github.com/olikraus/u8glib. Refer to the examples from this library, for example: Hello World, to learn how to print something on the OLED display module. 
State a variable and assign it to 'analogRead (A0)'. I have used the 'if...else' and 'else if' functions to perform the task for my project. As I have already stated in the first section of this project, calculate the ranges of analog values produced for each colour and record them. Implement them as the parameters of the 'if...else' and 'else if' functions to make each LED light up. The Red LED must light up when the variable's value falls within the assigned range. The similar process must occur for the other LEDs.
If you still need help with the codings, please feel free to comment below or send an email to arduinoprojectsbyr@gmail.com. 

Final Look

If you have any questions, or suggestions, about this project, please feel free to comment below or send an email to arduinoprojectsbyr@gmail.com.

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