Hi everyone
I am looking to build a device which will start and stop a stopwatch when it is passed. The situation is on a bike track, to automatically start a watch attached to the bike as you begin the track and stop it as you exit, thus giving a consistant lap time.
The device must not require physical contact and must be able to work at a distance of 1-2m (the more the better). The track in question is not a loop so would need two separate triggers at the top and bottom. Response time is not too much of a concern, quick is good but so long as its consistant its ok. Compact and lightweight is important too.
At the moment i have a button mounted on the bar to trigger the stopwatch which works but requires attention to push and obviously you'll hit it at a different time each lap.
I imagine some kind of radio activated relay would do the trick but i've no experience with radio triggering and wouldn't know where to start.
Thanks for any help!
I am looking to build a device which will start and stop a stopwatch when it is passed. The situation is on a bike track, to automatically start a watch attached to the bike as you begin the track and stop it as you exit, thus giving a consistant lap time.
The device must not require physical contact and must be able to work at a distance of 1-2m (the more the better). The track in question is not a loop so would need two separate triggers at the top and bottom. Response time is not too much of a concern, quick is good but so long as its consistant its ok. Compact and lightweight is important too.
At the moment i have a button mounted on the bar to trigger the stopwatch which works but requires attention to push and obviously you'll hit it at a different time each lap.
I imagine some kind of radio activated relay would do the trick but i've no experience with radio triggering and wouldn't know where to start.
Thanks for any help!