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Old 08-27-2012, 11:57 AM   #7 (permalink)
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Join Date: Apr 2011
Location: Lithuania
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There is no need for additional +12V supply from car cigaret socket. The schematic gets +12V from OBD socket.
This schematic was used instead of MC33290 in standard OBDuino ISO diagram.
Link: OBDuinoDiagram - opengauge - Whole diagram of the Arduino board, LCD, interface - Open Source Fuel Efficiency Instrumentation - Google Project Hosting
P.S. Only difference is in 510R, which was increased to 560R (That I found in internet).
P.P.S. 1N4004, 100R was used for protection SI9243 (from SI9253 datasheet).

Best regards
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