high power led lights

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JC asked How to build a 12v 24hr LED on off timer and dimmable For Reef aquarium?

Hello i need some help, i am going to build my own lighting system for my aquarium. I will be using 12v high power LED's these each have there own supplies. I would like to have a 24hr timer on and off plus maybe dim up and down at end of on period. Does anyone know how to build a timer like this which i could Program. thanks j

And got the following answer:

The easy way is with a microcontroller that has an RTC, or do an interrupt driven RTC using a watch oscillator. The work would be in software, which I would divide into three "modules" The first would be the RTC, which simply increases a counter each cycle of the crystal oscillator (either directly or divided down). That counter increases the main clock every second (32768 clock cycles), which you run minute/second/hour/day counters. The second would be the timer, which after an RTC cycle, compares the timer setting to the RTC, and if true, takes the action that timer setting is for. The 3rd would be the slope, which would drive the LEDs with PWM, based on programmed parameters over time.

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