Microprocessor Controlled Solar Tracking Device

Light sensitive tracking device. This was a really fun college project.
This is an excerpt from my project log book.

Download pdf of project log book.

I put the circuitry on 2 seperate boards with a connecting data ribbon.
1 board was the computer processor and the other was the I/O board.
That way, I could re-use the processor board for future projects.

The potentiometer adjusts the photosensor sensitivity.

The project was based on the 8085 microprocessor.

I used a stepper motor to control rotation of the parabolic reflector.
The reflector was actually a solar cigarette lighter from radio shack.
I attached 2 photosensors side by side on the reflector focal point.

More wire-wrapping technique, same as the digital oscilloscope project.

The electric motor is a 1.8 degree/step 12v stepper motor.

I entered this project into the 1987 DeVry Career Expo (Irving, TX) and won second place.
I didn’t sleep the last 48 hours before the competition and finally got it working just 10 minutes before the expo opened.


  1. December 15th, 2011 at 05:29 | #1


    Nice to see 8085 again that very awesome uP, i can’t stop thinking of it….
    it will be very grate to watch its video ls make video this…!!


  2. ravish
    March 26th, 2014 at 14:05 | #2

    its a very exciting project and i am very keen to make it .you are doing a wonderful job by providing us with all the information.Can u send us the schematic of the circuit board.we will be very grateful to you

  3. March 26th, 2014 at 14:07 | #3

    At the top of the page I provide a link to a scan of the project log book.. which contains the schematic… http://www.panofish.net/download//book2.pdf

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