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)
2004-03-04 -+- Bhavesh Gudhka -+- gudhkabhavesh@yahoo.com -+- I am looking for a circuit that can power off computer after halt. Is it posible with your circuit?
please suggest if any customization is required.
-+- 203.187.214.2 = Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4.1) Gecko/20031030
2004-07-29 -+- Guido Socher -+- -+- Kurt Schlager has some variants of this watchdog on
his homepage:
http://www.das.cc/subdomains/kurt/watchdog/index.php
You can find there also a driver for Windows.
The site is in German. -+- 195.71.95.22 = Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7) Gecko/20040626 Firefox/0.9.1
2004-12-31 -+- flavio vasconi -+- flaviova@tin.it -+- hi Guido, thanks for the great job you did.
By the way there is a small problem: if the application sending the pulses to DTR dies and the DTR remain permanently on, the wachdog does not detect it. A solution is to drive with this signal the reset 4. If you are interested i can send the diagram to you.
Thanks flavio -+- 217.8.221.137 = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; snprtz|T03024489500150)
2005-02-09 -+- james last -+- sdf@aol.spam -+- Hi,
great watchdog !!!!!!!!
Exactly what I was looking for .. Thanks you very very much !!
bye
-+- 217.230.82.25 = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1) Opera 7.11 [en]
2005-10-06 -+- hygy -+- hygy@freemail.hu -+- So is the DTR remain permanently bug resolved? -+- 212.40.64.11 = Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.10) Gecko/20050825 Firefox/1.0.4 (Debian package 1.0.4-2sarge3)
2005-10-08 -+- hygy -+- hygy@freemail.hu -+- Hi!
So the solution of the DTR stay on high level when crashed is:
<pre>
10uF
DTR --------||-----------R3 (3k3)-----
| |
LED 2k6 ohm
| |
| |
1k ohm |
| |
GND GND
</pre>
I put a led to see the signals comming from serial port. (I try this on a test board with 12V)
Now I connect it to serial and check it there too. -+- 81.183.253.208 = Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050517 Firefox/1.0.4 (Debian package 1.0.4-2)
#2006-10-17 -+- Laurent -+- -+- i need the sofware for windows 9X ...
lh -+- 83.157.143.104 = Mozilla/5.0 (Windows; U; Win 9x 4.90; fr; rv:1.8.0.7) Gecko/20060909 Firefox/1.5.0.7