Search found 115 matches

by hp
Sun Mar 05, 2006 7:46 am
Forum: General Discussion
Topic: Why Google Knows All
Replies: 20
Views: 2903

Re: Why Google Knows All

Google is NOT taking money for this, heck they don't want this to happen. The technique that these obessed people are using is to get as many pages as possible to have a link titled "Failure" to point to President Bush's biography. Eventually the googlebots will hit these sites and raise the page ra...
by hp
Mon Jan 02, 2006 5:08 pm
Forum: General Discussion
Topic: RFID low cost
Replies: 6
Views: 2019

Re: RFID low cost

Parallax sells a serial one for about $40 USD. That seems pretty cheap. They also sell tags for $2.25 each. RFID Reader: http://www.parallax.com/detail.asp?product_id=28140 Since you are in New Zealand, you might want to look at the reseller list at http://www.parallax.com/html_pages/company/distrib...
by hp
Sun Nov 20, 2005 9:26 am
Forum: General Discussion
Topic: Downloading speed...
Replies: 6
Views: 890

Re: Downloading speed...

To estimate speeds for broadband downloads (I am not sure if the same applies for dialup due to diff packet sizes): Divide your line speed (lets say its 5000 kilobits / sec) by 8, you should get the theoretical your theoretical max download speed in kilobytes. So: 5000 kilobits / 8 = 625 kilobytes (...
by hp
Wed Oct 26, 2005 2:58 pm
Forum: General Discussion
Topic: Power Line Monitor over Ethernet
Replies: 7
Views: 1096

Re: Power Line Monitor over Ethernet

I would use a tstik (http://www.tstik.com/) and write a java program to generate log files on the tstik's onboard memory and use it's built in java webserver for web access to the files. Not only that, but you could use it to initiate emails, http get requests, etc. The best thing about this device ...
by hp
Mon Sep 26, 2005 5:37 pm
Forum: Computer Programming
Topic: Waterlevel controller
Replies: 8
Views: 4136

Re: Waterlevel controller

Here are docs for a commercial hobby ultrasonic ranger module. The ranger is based on a 12c508. Schematics and asm source code are also included.<p>http://www.robot-electronics.co.uk/htm/srf04tech.htm<p>It would probably be easier to just buy the ready made module.<p>Harrison
by hp
Sun Aug 28, 2005 8:32 pm
Forum: General Discussion
Topic: Fixing Boston Acoustics BA635 sub
Replies: 13
Views: 2231

Re: Fixing Boston Acoustics BA635 sub

The speaker probably uses a simple full wave bridge with filter caps. This allows both dc and ac to work.<p>Here is a nice web page that talks about how it works: http://www.opamp-electronics.com/tutori ... _03_04.htm .<p>Harrison
by hp
Sat Aug 06, 2005 8:04 pm
Forum: General Discussion
Topic: Making hydrogen from water & DC
Replies: 208
Views: 40379

Re: Making hydrogen from water & DC

I am not trying to fuel the argument on hydrogen from water stuff, but there is a news article that sounds kind of 'similar' to stuff discussed in this thread.<p>News Link: http://news.yahoo.com/news?tmpl=story&u ... gy_chemist<p>Harrison
by hp
Sat Jul 30, 2005 12:56 pm
Forum: General Discussion
Topic: Ground Loop Isolation
Replies: 20
Views: 3378

Re: Ground Loop Isolation

Take a look at this article: http://www1.electusdistribution.com.au/ ... umloop.pdf . I don't know if it will help you, but it looks interesting.<p>Harrison
by hp
Mon Jul 18, 2005 2:43 pm
Forum: General Discussion
Topic: ID PC CARD Help ?????
Replies: 10
Views: 2762

Re: ID PC CARD Help ?????

Thats not an ISA card. ISA cards have alot more contacts on the edge connector that the card shown above. The gap on the edge connector is also too small to be an ISA edge connector.<p>Harrison<p>[ July 18, 2005: Message edited by: hp ]</p>
by hp
Wed Jul 13, 2005 1:36 pm
Forum: General Discussion
Topic: ULN2803A Darlington array - GRR
Replies: 11
Views: 1894

Re: ULN2803A Darlington array - GRR

Did you connect the other side of the coils on your stepper motor to the pos side of your 9v battery? I would check that first since the ULN2803A looks like it has open collector outputs. This means it switches to ground when active.<p>Take a look at the datasheet (http://www.ucapps.de/midio128/uln2...
by hp
Tue Jul 05, 2005 8:32 am
Forum: General Discussion
Topic: Component video to S-VHS converter
Replies: 3
Views: 797

Re: Component video to S-VHS converter

Your dvd player doesnt have s-vhs / svideo out? Thats really odd for one that has component out.<p>I would just go with the composite video out on the dvd player if it doesnt have svideo. The reason why is because the component signals are designed for a tv that can support the high resolution. If y...
by hp
Thu Jun 16, 2005 10:15 am
Forum: General Discussion
Topic: Disabling MCLR on Pic 16f628a
Replies: 4
Views: 810

Re: Disabling MCLR on Pic 16f628a

The MCLR pin will only function as an input in I/O mode.<p>I don't know what your project is, but the input mode has worked for me before.<p>I don't see any problems with using the MCLR pin as an input. The only major problem I see is if you are using ICSP. This would probably cause conflicts if you...
by hp
Sun May 08, 2005 8:12 pm
Forum: General Discussion
Topic: PIC16F628 Single Chip Stamp 1 Compatible
Replies: 2
Views: 2172

Re: PIC16F628 Single Chip Stamp 1 Compatible

Isn't that a bit expensive? One could buy a picaxe (which is more powerful then the stamp1) for a little over $10.00. One could get one at http://www.phanderson.com/picaxe/picaxe.html .<p>You could 'make' your own stamp 1 at http://www.geocities.com/SiliconValley/Cable/7772 .<p>I am not trying to be...
by hp
Tue Apr 26, 2005 10:17 pm
Forum: General Discussion
Topic: PCI Card Development
Replies: 6
Views: 963

Re: PCI Card Development

How fast do you have to control these motors? Would 115kbps from a serial port work? If so you could use the pci to serial port idea noted above. If you really need more bandwidth then use the usb idea in which you would include a usb host controller on your pci card, then connect one of the control...
by hp
Tue Apr 26, 2005 8:36 pm
Forum: General Discussion
Topic: PCI Card Development
Replies: 6
Views: 963

Re: PCI Card Development

Ack, must you use the pci bus directly? How about using a commercial pci to serial chipset. That would probably make life alot easier for the microcontroller. Either that or use a usb host controller chipset and use one of the new PIC18s with full speed usb.<p>Harrison