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Help me out to build a Moon tracking system

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pg_83in

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hello i am a student finding difficuites in the about titled project. here in this project i have to use a photo diodes as light sensors which would be connected to a PIC16F876. now further i have to use two stepper motors for dual axis movement. the stepper motor driver used is L6219. i need help about interfacing the pic, driver and the stepper motor. PLEASE COULD ANYBODY help me about the schematic diagram of the process.
 

project l6219

it's not a moon tracking system
it's motor drive system

Fire in the Wire :idea:
 

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    pg_83in

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moon tracking algorithm

The datasheet of the L6219 shows you how to connect the motor and it gives you info on how to choose the auxiliary components. The inputs of the L6219 are simply connected to the PIC. Since the PIC IO lines are configurable, you can pretty much connect them any way you like, just to make your PCB layout easier. (I would avoid using RA4, though, since it si open drain and there can be some issues with that).

Connections are not the problem. The real problem is writing the software to move and stop the motors.
 

Moon Tracking Sytem

pg_83in, you dont have to track moon - imho if your position date and time is known and orientation is right - moon position on sky could be estimated similar to how it is done in modern amateur telescopes equipped with gps.
So you dont have to deal with meaningless sky scanning in case of clouds or adjusting light sensor.

Good luck
 

Re: Moon Tracking Sytem

Hi,

I did something similar, and I noticed that a common way of doing it was to use some sort of 'grid scanning' algorithm, and then once you have found the moon, switch to a different algorithm which just moves in a small circle or square, just to make minor adjustments as the moon moves.

Another technique is to use more than one photo-cell, and compare the output from each photocell, in order to find the highest amplitude, so you know directly which direction to move in. This is much harder, this is the method I tried.
 

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