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Timeline for Detect car +12V using Arduino

Current License: CC BY-SA 3.0

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Jun 24, 2013 at 15:25 comment added John U It's not in that circuit, but if you replace the diode in the OP's circuit with a Zener it will protect against over-voltage as well as reverse-voltage.
Jun 24, 2013 at 13:44 comment added Phil Frost Where's the reverse diode / zener you mention? I don't see any such thing in the schematic.
Jun 24, 2013 at 8:43 history edited John U CC BY-SA 3.0
added 331 characters in body
Jun 24, 2013 at 8:28 history answered John U CC BY-SA 3.0