XNote Stopwatch

Interested to know how the signals from your photocells were transmitted to the computer?

roger wrote:Interested to know how the signals from your photocells were transmitted to the computer?

Actually signals are not initiated by photocells. Photocells just "connects" supplied voltage from PC from one pin to another.

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?