2002-07-04 -+- Greg Pratt -+- gpratt3151@yahoo.com -+- Once again, thanks for a great article! Interfacing external hardware to
Linux systems is an important topic and you've done a great job starting
from the basics and building up from there. -+- 12.238.175.161 = Mozilla/4.78 [en] (X11; U; Linux 2.4.7-10 i686) 2002-07-08 -+- Alain Gauthier -+- AlGauRythme@yahoo.com -+- We need good articles like yours, especially in hardware. You do a great
job. Congradulations and keep on the good work. -+- 206.186.58.224 = Mozilla/4.7 [fr] (Win98; I) 2002-07-08 -+- William Hathaway -+- william@melug-central.org -+- Very good article.

However you noted only in passing a realworld application for this circuit. That is rebooting a hung computer that controls hardware is in an inaccessible place such as on the top of a mountain.


-+- 12.25.48.162 = Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0) 2002-08-03 -+- colyli -+- colyli@263.net -+- This watchdog maybe can resolve Linux SMP auto powerdoen problem. When we try to type "halt -p" to shutdown SMP Linux system, the machine often failure for powerdown. If this watchdog can set a timer after we shutdown sytem, and act hardware to powerdown when timer expired, we can implement system auto powerdown!

great designing! -+- 211.100.14.13 = Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0) 2002-09-18 -+- Freak -+- -+- Great article...(on of the best i've read in the last month)

one question left: do you think it is right, that the RTS Voltage goes to the Reset Pin(4) of the NE555 insted of the Control-Votlage Pin(5), like in your drawing??
May be, i am fault, but i don't understand, why the NE555 schould be under reset all the time... -+- 212.184.130.131 = Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0) 2002-09-18 -+- guido -+- -+- HI "Freak",
no the NE555 schould not be under reset. That's why it has pin 4 connected
to supply voltage. Reset connected to logical "1" means reset off for the
NE555.
-+- 217.185.247.8 = Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.0) Gecko/20020529 2002-09-18 -+- Freak -+- -+- ok, thank you very much for your reply, i will try to build this circuit soon... -+- 62.224.104.106 = Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0) 2002-12-29 -+- guido -+- -+- There is a new and updated design available (version 0.4):
http://www.linuxfocus.org/common/src/article239/ -+- 217.185.247.4 = Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20021130 2003-02-10 -+- atrak -+- watchdog@compot.ru -+- А это наш watchdog
http://team.mit8.ru/projects/watchdog/index.php
-+- 213.252.124.155 = Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)