RE: [avr-chat] Using Rotary Encoders...

[Larry Barello]

www.barello.net/Papers/Motion_Control

has assembly versions of the 2x encoders that I suggested.

Cheers!

-----------
Larry Barello
www.barello.net


| -----Original Message-----
| From: address@hidden [mailto:avr-chat-
| address@hidden On Behalf Of Vincent Trouilliez
| Sent: Wednesday, September 21, 2005 4:16 PM
| To: address@hidden
| Subject: Re: [avr-chat] Using Rotary Encoders...
| 
| Brian, Larry & Rich,
| 
| 
| Sorry for the late reply, but my AVR started again refusing to connect
| to avrdude. Spent lots of time on it. In the end it seems the AVR might
| be dead for good this time, well at least some or all of the SPI port
| pin drivers which I might have killed when powering off the AVR board
| BEFORE unplugging the // cable ! :-O Big mistake... Chip now
| consistently refuses to talk to avrdude. I swapped it with another AVR I
| had in stock, and this one consistently successes in chatting to the PC.
| Plugged the old AVR back in again just in case, but no, still mute. So
| this is it... :-/
| I better be careful with this one now, I don't have anymore left in my
| drawers ! ;o)
| 
| Thanks for your suggestions, I can now at last start experimenting them.
| BTW are these only suggestions, or are they first hand experience ?
| If someone has actual working code, might help to have a look at
| it ! :-) Maybe I can find some app. note somewhere on the web.
| 
| 
| My chip is a mega32 (sorry for consistently forgetting to mention what
| chip I am using, I will try and improve in the future...)
| 
| Yeah I did put pull-down (not pull-up) resistors on both channels.
| Pretty strong ones actually... 1Kohm. The encoder datasheet doesn't
| specify the minimum current to 'wet' (not sure of the English
| terminology here !) the contacts, so I figured 5mA would be plenty
| enough. Max rated current is 20mA @ 5V anyway, so I am still on the safe
| side.
| 
| I uploaded the 3 page datasheet there :
| 
| http://www.007.org.uk/~vtrouilliez/temp/encoder.pdf
| 
| 
| Thanks again for the ideas, I will post again in a while, once I have
| taken some time to experiment.
| 
| 
| Regards,
| 
| 
| --
| Vince
| 
| 
| 
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