MAX3421E interface padsare used to make the shield modifications easier. Pads for SS and INT signals are routed to the Arduino pins 10 and 9 via solder jumpers. In case the battery is taken by other shield an re-routing is necessary, a trace is cut and corresponding pad is connected with another suitable Arduino I/O ping with a wire. To undo the operation, a wire is removed and the jumper is closed. See interface modifications section for more information. GPX pin is not used and is available on a separate pad to facilitate further expansion. It can be used as a second interrupt pin of MAX3421E.
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