Re: [oopic] Reed switch help

On Aug 11, 2008, at 11:38 AM, ray xu wrote:

> The resistor acts as a pull-low resistor. A 10K-ohm or a 4.7K-Ohm
> is good

If all I am doing is counting pulses I try not to tie inputs to Vcc at
least not without a series resistor. Drive the input as an output and
you could smoke the pin. I would use the reed switch to ground and a
pull-up resistor to Vcc/Vdd. I agree with your value of 10K.

Vdd
|
10K
|
pin<-----+
|
reed switch
|
Vss (ground)

Brian Lloyd
Granite Bay Montessori School 9330 Sierra College Bl
brian AT gbmontessori DOT com Roseville, CA 95661
+1.916.367.2131 (voice) +1.791.912.8170 (fax)

PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C

------------------------------------

Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/oopic/

<*> Your email settings:
Individual Email | Traditional

<*> To change settings online go to:
http://groups.yahoo.com/group/oopic/join
(Yahoo! ID required)

<*> To change settings via email:
mailto:oopic-digest@yahoogroups.com
mailto:oopic-fullfeatured@yahoogroups.com

<*> To unsubscribe from this group, send an email to:
oopic-unsubscribe@yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/