> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of John Gardner
> Sent: 17 August 2009 16:45
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] Bicycle Speedometer Project
> 
> I like Olin's approach on this one.
> 
> As mentioned, I've had many reed switch failures in this application.
> Pace doubters, they are mounted with proper strain relief, in
protected
> locations, and kept dry - Not hard in Southern California.
> 
> Difficult to imagine the "abuse" postulated. I've autopsied some of
the
> failures - Switch non-op in all of those.
> 
> Considering the reliability figures claimed for reed switches, one has
to
> wonder - Perhaps a mechanical resonance at a speed I favor? (Lance
> has nothing to worry about from me :)
> 
> Anyway, I'm ready for a different scheme.

Even the more expensive brands of bike computer (e.g. Sigma) continue to
use reed switches (at least on the wired version).  If there were
significant unreliability issues you'd have thought they would be using
an alternative by now?

Regards

Mike

=======================================================================
This e-mail is intended for the person it is addressed to only. The
information contained in it may be confidential and/or protected by
law. If you are not the intended recipient of this message, you must
not make any use of this information, or copy or show it to any
person. Please contact us immediately to tell us that you have
received this e-mail, and return the original to us. Any use,
forwarding, printing or copying of this message is strictly prohibited.
No part of this message can be considered a request for goods or
services.
=======================================================================

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist