Instructables

This is a simple solar tracker which automatically orients itself towards the sun or any bright source of light like the sun .If you place solar panels on this robot it can increase their productivity by 90 to 95 %. At first creating a solar tracking robot may sound complicated but it quite quickly becomes clear. As the title suggests it runs on the arduino board .This is a fun to do and low cost project.

This instructable was inspired from geo bruces instructable solar tracking robot

This instructable explains how to create your own solar tracking robot, how to set up the robot and how to test the robot.

This instructable is a entry in the robot challenge in the age category of 13 - 18 (I am 14 years old). 
 
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Step 1: Parts & Tools

Parts:
~ 2 x Servo Motors - Local Electronics Store
~ 4 x LDR's - Local Electronics Store
~ 4 x 10k Resistors - Local Electronics Store
~ Arduino Uno - Sparkfun.com
~ 2 x 50k Variable Resistor - Local Electronics Store

Tools:
~ Soldering Iron - Sparkfun.com
~ Solder Wire  - Sparkfun.com
~ Jumper Wires - Sparkfun.com
~ Protoboard - Local Electronics Store

All the parts will cost you less than 30$ (Excluding the arduino and all the tools)

Step 2: Build The Circuit

The Circuit is pretty simple connect the four LDR's to analog pins 0,1,2 and 3 respectively via a 10k resistor.Connect the two servos to digital pins 9 and 10 respectively.Conect the two variable resistors to analog pins 4 and 5 .Take a Look at the pictures they really help.See the last picture for the circuit diagram (It might be the baddest that you have ever seen).
Alright, so did you write this originally, or did this guy:

http://www.instructables.com/id/Arduino-Solar-Tracker/
the link you posted is mine instructable
I wrote it almost a year before this guy "copied" it.
but he didn't read the license terms

This license lets others remix, tweak, and build upon your work non-commercially, as long as they credit you and license their new creations under the identical terms.

"as long as they credit you" <<< you didn't :(
Bot1398 (author)  geo bruce3 months ago
Hey, sorry for not mentioning it before. I have now mentioned your name and a link to the instructables
aleza848 months ago
Are the separator between each photoresistor necesary?
Bot1398 (author)  aleza848 months ago
Yes
McAldo9 months ago
Nice tutorial, I like it and the cardboard solution is ingenious. Looking forward to try this :)
emdarcher1 year ago
you should make it powered by a solar panel that it holds, and directs towards the light, it would be independent. also you could split the power to go to the arduino, and some for surplus energy.
Your diagram has free wires
mmorlan622 years ago
That has got to be the punkiest build I've ever seen. LoL! :)

I like the simplicity of the circuit and code. Well done.

Consider painting your cruciform tube black (eliminating stray bounces off the cardboard) to improve the accuracy of the sensors.

Consider how this setup will react to cloudy days. Will it be sending the servos all over the place looking for the brightest spot in the sky? If so, how do you slow down the motion so you don't burn out the servos? Consider adding some acceleration curve code to the movement of the servos, especially once they are driving a load.

Also, consider adding a power relay circuit for the servos so your arduino can turn them on and off, thus relieving them of stress when they aren't moving anyway. The code could;

o turn on the relay, powering the servos
o move the servos to their new position via acceleration curves
o turn off the relay, shutting down the servos

Have fun!
seraine2 years ago
You should consider making a schematic, because it makes it a lot easier to understand. Great Instructable, though.
Bot1398 (author)  seraine2 years ago
I added a circuit diagram (last pic step 2) now
jwkooi2 years ago
Nice project! Well done. Do you have a youtube clip to see it working?