My current design is more or less as follows: The main microprocessor is an ATmega328P, which outputs low-frequency PWM to an LTC6992-1 PWM modulator (it takes a constant voltage, nominally, but its response is essentially flat up to 10% of the output frequency, at a nominal 25kHz output). That last point is where I'm having some trouble. Single serial (RS232 or USB) interface to the outside world, including for firmware updates.I'll probably go with a SATA power connector anyway, but I'd like it to work with molex-SATA power adapters, which only have +12V and +5V +5V and +12V only, since I wanted to avoid having to regulate that down to 3.3V on the board or rely on a SATA power connector.Microprocessor control, to receive temperature readings from software - mostly hard drive temperatures, since those are the ones that your typical motherboard fan controller knows nothing about, but the idea is to make this as generic as reasonably possible.Some additional design considerations would be, in no particular order: Just to be sure everyone's on the same page, the goal would be to do the actual control with 4-pin fans, with a dedicated PWM input for control (power is separate +12V, routed straight from a molex connector to the fan headers). I recently started thinking about what would be my first electronics project: A PC PWM Fan Controller.
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