"PDT Timer" Setup (a DIY Arduino based timer)

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You can interface with a PDT Timer (aka "Yet Another Arduino based track timer"), using GrandPrix Race Manager's custom timer interface.

Instructions for building this timer can be found at https://www.dfgtec.com/pdt
Discussion on building this timer can be found at http://derbytalk.com/viewtopic.php?f=66&t=6216

Of all of the DIY timers that we have seen, we think that this one is the best thought out and implemented timer project.

This is not a supported timer, meaning that we cannot guarantee how well the software will work with that timer. In other words, use it at your own risk. We do recommend using one of the supported timing systems instead, as we have agreements in place with those manufacturers to ensure close compatibility of our software with their timers.
Starting with GrandPrix Race Manager Version 14, only the Pro version has the "Other Serial Timer" interface.