I'm very new to electronic projects, I know the BASICS of circuits (i.e Ohms law, capacitance)but I've never constructed something on my own.
For my project I want to take the side fan for my computer case, which is a 4-pin connection to the power supply, and which also powers an LED on the fan, and interface it with a micro-controller to change fan speed based on temperature and and also user input, so it has the fan speed increases from the user pressing a button or from automatic temperature readings and a strip of LED's to light up in a row, like a progress bar to show fan speed "intensity".
With my basic knowledge I've come up with some questions that I THINK would need to be answered to do this project. As far as I know, fan speeds can be manipulated by a changing voltage, so I'm ASSUMING that I need to build a circuit of resistors that can change this output voltage value based on switches that are turned on by the micro controller, is this correct? And I'm trying to find a way that I can interface the 4-pin connection with my micro-controller? Also what kind of battery or powersupply do I need to power this circuit? Do I need to know the wattage needed for the fan? Thanks to anyone who lends me advice, It's much appreciated.
Here is the board specifications if needed http://www.socialledge.com/sjsu/index.php?title=SJ_One_Board
And a link to the fan being used. http://azzatek.com/PDF/CSAZ-1000-Solano-Users-manual.pdf (fan on the side)