Build Instructions

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• 1

  Step 1

  Assuming you now have all of the parts available at your disposal (plus a few spare just in case - you know how sods law is). Start with looking at how you are going to lay out the parts and wire/solder them up. 

  I probably went overboard by using a circuit board editor and actually creating the layout for my prototype board. At least by doing this I could see how large the components would be and how they would sit. 
  Comparing with the actual parts also helped in laying it out cleanly.
  All else fails, scratch it up on a piece of paper. In the above pic, blue runs were mainly component wired. Red runs were with CAT5 copper wire.

• 2

  Step 2

  Now you know how this is going to look and is a layout you are happy with. The next step is to wire up the AVR micro into a breadboard and use jumpers from the correct ISP pins to connect to the programmer. Consult the datasheets for the correct pinout (I might expand on this later). 
  NOTE: When programming, ensure you untick the CLKDIV8 fuse otherwise it will only be at 1MHz - and be too slow for a decent PWM to the fans.
  I took things a step further and wired up an encoder and a LED off of the corresponding PWM Channel, just so I could see the dimming/brightening of the LED.

• 3

  Step 3

  Now that you've used the attached code (I'm going to assume you have anyway...) have a play if you like to ensure all is going smoothly. 

  This is everything hooked up on a breadboard.

  Otherwise, it's time to assemble the finished product!

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