|Category: Custom Timer Settings||
|"Derby Magic" Setup|
|"Derby Timer" Setup|
|"SuperTimer II" Setup|
|"PDT Timer" Setup (a DIY Arduino based timer)|
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
Of all of the DIY timers that we have seen, we think that this one is the best thought out and implemented timer project.