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HighVoltageLP

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    HighVoltageLP reacted to dubnet in msp430g2452 pwm fan controller   
    First of all, welcome to the forum!
    In terms of pin usage you will want to pay attention to pins already used by the Launchpad (e.g.switches and LEDs) to avoid conflicts.
    With regard to the fan speed control, why not use temp sensor(s) in lieu of the potentiometers fed into the A./D converter? Perhaps just one, or possibly two, would be enough to adequately control the speed of all four fans. Just a thought....
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    HighVoltageLP reacted to dubnet in msp430g2452 pwm fan controller   
    If you use the 2553 on your own PCB you will want to replicate the reset circuit (capacitor and resistor) that the Launchpad uses. Otherwise the MCU won't run.
    On the temperature sensor(s) I was envisioning using something like an LM34 or LM35 placed near the area in the PC enclosure you are interested in keeping cool. If this is done then when the PC is idling along the fans should run slower and when you are pushing it the fans will run at near maximum speeds.
    I would guess that you have some free four pin power plugs (with 5V) in the chassis. If you add a 3.3V linear regulator to your PCB to drop the 5V then it would resolve your power issue without splicing.
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