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June 10, 2011

Automatic Offroad Electric Cooling Fan Dis-abler REV2

Original post

This is the second revision of my design. I added new features and lots of tweeks.

  • Delay of fan start when vehicle is turned on.
  • Delay of fan restart after the water switch has been tripped.
  • One wire water switch, based on “touch switch” technology.
  • 12 or 24 volt system ready, out of the box.
  • Lower part count, now it will fit in a much smaller case.
  • Redundant safety to keep the fan running fully, if the device fails.
  • Very low current draw when in operation.
  • Indication LED to show fan on/off state.
  • Watch Dog enabled to keep the microcontroller from locking up.

Next Rev will most likely be an all SMD device.

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