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# Anti-Sunflower – Points to Your Darkness!

Since childhood, I always wanted to try my hands on electronics. Recently I bought the Arduino and started exploring it. In this process, I got to know more about Light Dependent Resistors (LDR).

Somehow, I stumble across this idea. Basically, it’s an electric sunflower which does the opposite of actual sunflower. It points to the darkness!!!

## Step 1: Stuff You Need

• 3 LDRs
• 3 10k Ohm resistors
• A servo motor
• Arduino Board
• Few Jumper wires
• Soldering Kit
• Perforated PCB
• Small Pot along with some dry soil.

## Step 2: The Circuit

The crux is each LDR is responsible for an angle, left for 180 degrees, middle one for 90 degrees and right one for 0 degrees. For example, if the middle LDR not receiving any light and other LDRs are getting some light then

• Left LDR => HIGH
• Middle LDR => LOW
• Right LDR => HIGH

Based on this input, Arduino can compute the angle (90 degrees in this case) and send this information to the servo motor.

## Step 3: The Code

In layman terms, that’s what the code does:

• It takes input from 3 LDRs.
• Using this input, it calculates the amount of light each LDR is getting.
• Now, it computes the angle it should go. For example if the right & middle LDR both are not getting any light, then the angle calculated will be 45 degrees (Mid angle of 0 degree & 90 degree is 45 degrees).

Find the code here.

## Step 4: Build the Circuit

Use Perforated PCB to solder resistor and LDRs. Use the Arduino breadboard for connecting PCB and servo motor. Upload the code and test.

## Step 5: Plant the Anti-sunflower

I’ve used a small pot and made a hole in it to pass the wires. Put some soil, keep the servo motor, add some more soil. Then just connect the servo motor with Arduino and you’re done!

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