Understand. Photocell is a switch. If distance is too great for cables I would like to know if anyone has a good system of wireless connection to a computer. I have since found in the forum a post by
"aussie phil" dated oct 29 2009 number 898 and would like to try that idea. Anyone else with this? I need to put a sensor on a start line, another on a finish line and both send to a remote computer for the XL results sheet. Anyone tried two starters on the same track at once with an interval of say 1 minute? How would finish line identify each?