Arduino : Turn On Particular Color LED Depending On Light/LDR

We have lot of getting started guide with LDR. How To Turn On LED in Dark With LDR and Arduino is the basic behind all of them. We can perform the same work using transistor – Turn On LED On Dark With Transistor. As the value of LDR will be variable depending on batch, you need to run the basic Turn On LED in Dark guide to note the values on serial monitor in various lighting situations like inside room, at dark and sunlight etc. With Arduino We an Turn On Particular Color LED Depending On Light/LDR With Simple Circuit and Easy Code. The basic logic is based on Control Multiple LED Depending on the Level of Light or with just this code when LDR is connected –

 

Code and Connection To Turn On Particular Color LED Depending On Light

 

We will use 4 LDR in this project. We need the following parts :

1. Arduino UNO or similar board – ONE
2. LDR – ONE
3. 10K Ohm resistor – ONE
4. LED – THREE (One RED, One Green, One Yellow)
5. 220 Ohm resistors for LEDs – THREE
6. Breadboard – ONE
7. Jumpers – Few

This will be the circuit diagram (better to say connection) :

We can write the logic in various ways, like –

The values like that of 600, 750 are based on reading on serial monitor with my LDR. Your LDR likely to give different values and you may need to change it.

You can blink a particular colored LED with minimal modification in coding, like if you want to blink the red LED on dark and others to give stable light then you can write –

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