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.