AVR-Chat

2 optical sensors could be used to decode 4 positions of a white/black 
surface that could be read on powerup... an absolute position encoder (as 
opposed to the relative position encoder).
The mechanics of it are up to you, and it may not be cheaper than the <$2 
you mentioned earlier.

Cat

----Original Message Follows----
From: BobGardner@aol.com
Reply-To: AVR-Chat@yahoogroups.com
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] Re: OT- Anybody know of a small 4 position slide 
switch?
Date: Mon, 7 May 2007 20:43:13 EDT


In a message dated 5/7/2007 5:58:00 P.M. Eastern Daylight Time,
rcooke@digitalwavelength.com writes:

I don't  think I can make an encoder work.  If the user happens to move
the  knob while the unit is powered off I don't think I can get the
controller  to figure out what position it is now in.  Or do I have
that  wrong?



====================================================
The encoder just gives you an 'increment' or 'decrement' If you save where
you are in eeprom, it stays there to next power on. Knob detent doesn't 
matter.
  4 leds could give you position. Or 4 of those momentary schadow switches
with  the leds in them? Make them mutually exclusive in the  sw



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