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hi everybody
am doing a graduation project about solar tracking system in one axis using parabolic mirror and i stopped these-days in programming micro-controller which control the system !!
i can't know what i need to make the program ??
anybody can help me ??
I suggest that you use a either a photo transistor or a Light Dependent Resistor (LDR) to track the Sun.
Mount it on the mirror frame so it moves with the mirror in a slot so it can only "see" a narrow angle of the sky.
Connect it to the analogue input to the micro controller & write the programme so that it makes the motor move until the light detected is at a maximum.
Better would be to use two LDRs or phototransistors, with a "baffle" placed between them (or in tubes, as you suggest); this way, you could determine which direction to move. Then again, in the trivial example you will only be moving in one direction until end-of-day, but in a more complex scenario, with shadows, clouds, reflections, etc - you may want to be able to move in both directions (also, if you use four sensors, you can implement dual-axis control).
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