Search found 26 matches
- Wed Feb 11, 2004 12:00 am
- Forum: General Discussion
- Topic: Intro to Microcontrollers HELP
- Replies: 8
- Views: 4537
Re: Intro to Microcontrollers HELP
This maybe of some help. This link has a comparison between the oopic and basic stamps.<p>I'm a beginner, too. I've got an oopic and I've played with the pic16F84. I found the object oriented programming of the oopic easy to use, but it's expensive. I'm always afraid I'll smoke it. The oopic can be ...
- Sat Jun 28, 2003 4:45 pm
- Forum: General Discussion
- Topic: Ni Cad chargers help
- Replies: 15
- Views: 9285
Re: Ni Cad chargers help
What about using one of the charge controller ic's?
The max712/713 are one example. They'll send you a free sample and there are several examples out on the internet of chargers people have made that can help guide you.
I've been working on a 13.2V charger.....haven't got it working yet.
Scott
The max712/713 are one example. They'll send you a free sample and there are several examples out on the internet of chargers people have made that can help guide you.
I've been working on a 13.2V charger.....haven't got it working yet.
Scott
- Fri Jun 13, 2003 7:19 am
- Forum: General Discussion
- Topic: Battery running times
- Replies: 4
- Views: 3241
Re: Battery running times
For lead acid batteries, that amp-hour rating is usually cited over a 20 hour period. For example, 10 Ahrs/20hrs = 0.5A . If you drew 0.5A out of the battery, you would expect to get the full 10Ahrs out of it. But, the capacity decreases when you put heavy loads on it, expecially for lead acid batte...
- Sat May 03, 2003 5:22 pm
- Forum: General Discussion
- Topic: Drill Battery Pack Dies Suddenly!
- Replies: 5
- Views: 3231
Re: Drill Battery Pack Dies Suddenly!
WildBoar, I've had a few battery packs made, and made a few myself from surplus battery packs. You might save a little if you DIY, but typically they pack those batteries in there pretty tight which makes it a big hassle to get it all back in. I think it really comes down to how much you like to tin...
- Thu May 01, 2003 10:17 am
- Forum: General Discussion
- Topic: Temperature readings into a PC?
- Replies: 16
- Views: 7844
Re: Temperature readings into a PC?
Stuffed,
You've already got alot of good info here, but you may want to check out this page DS1621 pc thermometer
Its a simple circuit, he gives you the software and it will log to a .txt file.
good luck
Scott
You've already got alot of good info here, but you may want to check out this page DS1621 pc thermometer
Its a simple circuit, he gives you the software and it will log to a .txt file.
good luck
Scott
- Fri Apr 25, 2003 7:49 am
- Forum: General Discussion
- Topic: need advice for multimeter with pc interface
- Replies: 6
- Views: 3531
Re: need advice for multimeter with pc interface
Thanks everyone, I ended up getting the RS meter. MrAl: Good point about two inputs. I looked around, but the price seemed to go up dramatically. Does anyone know why most of the meters log at only 1 sample/sec? If you were to write your own program could you increase the sample rate, or is the mete...
- Wed Apr 23, 2003 7:50 pm
- Forum: General Discussion
- Topic: do it yourself ekg
- Replies: 12
- Views: 6590
Re: do it yourself ekg
Thanks SmallWorld. I did check out LabJack, but like Sam, its more than I want to spend. However, you got me looking around and I found another product by Dataq: 10 bit, 4 channel, +-10v and 240 samples/sec, and software for $25. Not as versatile, but sounds good for the price.<p>Sam, whats the samp...
- Wed Apr 23, 2003 7:41 am
- Forum: General Discussion
- Topic: do it yourself ekg
- Replies: 12
- Views: 6590
Re: do it yourself ekg
Thanks Sam. I'll give that a try. My scope is an old surplus unit, that may be problem. I do see the EKG trace, but it happens too fast to study it. Is the student version a of LabView the same as their free evaluation version? I've been to their web site, but its a 91.5MB download ! Do you have a L...
- Mon Apr 21, 2003 9:00 pm
- Forum: General Discussion
- Topic: Resources for Switching Power supplies
- Replies: 11
- Views: 5781
Re: Resources for Switching Power supplies
Radio Shack has a book for about $8 called Building Power Supplies. I think it has three switching supply projects. It has a little background theory, but mostly it just gives you the equations for sizing the components. I found it very helpful, but I'm a hobbiest, not an EE.
Scott
Scott
- Thu Apr 17, 2003 11:31 am
- Forum: General Discussion
- Topic: do it yourself ekg
- Replies: 12
- Views: 6590
Re: do it yourself ekg
Hi Sam, I'm not an EE either. I'm a civil/environmental engr., but I like to tinker. Labview is a data logging software, isn't it? I tried to view my ekc signal on my oscilloscope, but it doesn't work very well. I think the problem is that I can't adjust the time scale to be slow enough. I think a d...
- Thu Apr 17, 2003 9:06 am
- Forum: General Discussion
- Topic: Cheap sound generatot
- Replies: 3
- Views: 2467
Re: Cheap sound generatot
Well, I don't know about porche or viper sounds, but there is an old sound generator chip sn76477. There ia a radio shack app note and a popular electronics article about it. They describe a circuit for race car engine sounds, but I've never heard it. Here is a site with the data sheet, app notes an...
- Wed Apr 09, 2003 9:15 pm
- Forum: General Discussion
- Topic: water sampler
- Replies: 10
- Views: 4885
Re: water sampler
Another motor that comes to mind is a RC servo motor. They can be easily modified to rotate continuously, they're geared low, have quite a bit of tourqe and they're cheap. I think you can get them for as little as $9 at servocity.com. People use them alot for robots so there is also alot of info abo...
- Wed Apr 09, 2003 8:27 pm
- Forum: General Discussion
- Topic: do it yourself ekg
- Replies: 12
- Views: 6590
Re: do it yourself ekg
In case anyone wants to read about it:<p>http://www.sciam.com/article.cfm?colID= ... 9EC588EF21
- Wed Apr 09, 2003 8:25 pm
- Forum: General Discussion
- Topic: do it yourself ekg
- Replies: 12
- Views: 6590
do it yourself ekg
The June 2000 issue of Scientific american had an article about a do it yourself EKG. Has anyone built this circuit? I've built the circuit, but would like to compare notes with someone.
Scott
Scott
- Wed Apr 09, 2003 2:26 pm
- Forum: General Discussion
- Topic: binary clock
- Replies: 5
- Views: 2769
Re: binary clock
I just searched google. There seemed to be alot. This looks like a good one.
http://www.namon.net/binary.html<p>There are also clocks for your windows desktop.
Scott
http://www.namon.net/binary.html<p>There are also clocks for your windows desktop.
Scott