In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

Pj Allen,

To compensate for temperature, does the system use a differential loop coupling approach, or is it more of an adaptive approach (i.e. high pass filter - only responds to sudden changes, gradual changes are ignored)?



william chan,

There are several ways to sense the presence of metal ( a Vehicle) within the proximity of a coil.  Depending on what you are willing to invest may help determine what technique you use.  My suggestion would be to go with something that is low power as possible so that your coil does not become a transmitter.  Differential sensing is good, because you can negate any temperature changes but it requires careful positioning of 3 coils in order for it to work correctly.

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=222464#m222834

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)