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ANT and bluetooth have a very limited range indeed so i was thinking creating a wifi hotspot via the laptop. Then you get a mush better range, hopefully enough to get the data from the middle of the velodrome. Your garmin is then connected to this hotspot (all that have to be tested first obviously but a wimax get a range of few miles).
Never worked on this kind of technology and i'm far from being an IT but it should be possible to push the data via the wifi for the software to capture them in real time. You now can pass a movie from your mobile to the TV via wifi, no reason a low volume of data couldn't pass through.
In the end, you could even capture data from every rider at the same time. The soft (probably C++) would be able to compare instantly the data from every riders between their own series and each others.
I will think about it further and look into it seriously in the next few weeks, you could even get the data from a car behind a group of rider but that would really depend how the wifi would perform in that case.
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santino
This sounds great. How would you relay the data? ANT radio range is super limited. Would you add an intermediate hop via your smartphone?