Bike Forums - View Single Post - Triggering a Red Light in-ground sensor

11-01-09, 04:16 PM

#15

cyccommute

Mad bike riding scientist

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Quote:

Originally Posted by Kilted Commuter

Consider attaching a rare-earth magnet to the underside of your bottom bracket, get a strong one, 20# or so, glue it, tape it, drill it and rivet, whatever your preference. When arriving at the sensor, be sure to stop with the magnet directly above one of the cables.
Or follow this instructable: http://www.instructables.com/id/Traf...for-your-Bike/
Or buy one of these: http://www.greenlightstuff.com/trigger.html

Magnets do nothing to help with triggering stoplights. It's been covered before. The magnetic field of the magnet is too small...even with a strong magnet...to have any effect on the induction loop. Your statement above of "...be sure to stop with the magnet directly above one of the cables", will do more to trigger the sensor than even dozens of magnets would. Your bike wheels are closer and have a better interaction with the sensor. Look at Steve Goodridge's link given above for an explanation.

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