Search found 99 matches

by wd5gnr
Wed Jun 02, 2004 6:08 am
Forum: General Discussion
Topic: looking for schematic / plans
Replies: 15
Views: 2325

Re: looking for schematic / plans

Well, I'll bite. How about using an LM34? This outputs 10mV/degree and 100 degrees would be 1V. Then you could use one of the cheap LED panel meters and set the decimal point in the right place with a divider:<p> http://www.web-tronics.com/test-equipment-panel-meters-digital-panel-meters--lcd---led-...
by wd5gnr
Wed Jun 02, 2004 6:01 am
Forum: General Discussion
Topic: PIC Programmer
Replies: 15
Views: 2480

Re: PIC Programmer

Hi Mike,<p>Have a look at http://tutor.al-williams.com -- these tutorials discuss the 16F873 which is the same as a 16F877 except it has fewer pins and slightly less memory. The core is exactly the same.<p>Also, http://www.piclist.com is a good resource.<p>As for projects, take a look at some N&V ba...
by wd5gnr
Tue May 25, 2004 2:59 pm
Forum: General Discussion
Topic: Unusual Blue LED source
Replies: 4
Views: 1173

Re: Unusual Blue LED source

Hi Edd. You have to wait for the shoes to go on clearance :-)<p>That's 50 cents an LED. You can get them with less work for 50 cents/each: <p>.here<p>Of course, no shoes (I hesitate to call them flip flops around here).
by wd5gnr
Thu May 20, 2004 1:33 pm
Forum: General Discussion
Topic: data i/o 201 EPROM Programmer
Replies: 2
Views: 573

Re: data i/o 201 EPROM Programmer

Yeah, this is one that has been obsoleted and they don't support it at all, which means they pull the documents and everything as far as I know. They "sold off" all the old stuff to one of their old sales managers and they will sell you the users manual (but don't know if it discussess error codes; ...
by wd5gnr
Thu May 20, 2004 10:29 am
Forum: General Discussion
Topic: data i/o 201 EPROM Programmer
Replies: 2
Views: 573

data i/o 201 EPROM Programmer

Anyone have any documentation for this old EPROM programmer? I get a fail code 95 when it powers up and have no idea what that means. The CPU is obviously working since the LCD drives OK. The power supply board is ok disconnected, but the 5 and 5.5V supplies drop about 1/2 volt when connected to the...
by wd5gnr
Wed Mar 31, 2004 3:07 pm
Forum: General Discussion
Topic: science project
Replies: 4
Views: 733

Re: science project

Take a look at http://www.wd5gnr.com/rfrem.htm and make a trip to Radio Shack. I think this will do what you want.
by wd5gnr
Tue Mar 30, 2004 10:06 am
Forum: General Discussion
Topic: Corrected Xilinx Cable schematic
Replies: 0
Views: 707

Corrected Xilinx Cable schematic

In the "A Really Solderless Breadboard" article this month, there is a link to JTAG schematic on the Xilinx site. It has moved and you can find it here now.<p> Schematic <p>Keep in mind that with the kit mentioned in the article, you don't need this schematic since the kit includes a suitable JTAG a...
by wd5gnr
Wed Mar 10, 2004 10:37 am
Forum: General Discussion
Topic: Using transparencys for pcbs?
Replies: 9
Views: 1293

Re: Using transparencys for pcbs?

I've used transparencies. The key is to use ones meant for a laser printer since they will hold up under the heat. Also use a piece of paper between the iron and plastic just in case (hard to clean that plastic off the iron -- um, not that I'd know from first hand experience -- NOT!).<p>The good par...
by wd5gnr
Mon Mar 08, 2004 2:51 pm
Forum: Computer Programming
Topic: Visual Basic help
Replies: 4
Views: 1911

Re: Visual Basic help

I think you want this.<p>Al Williams
AWC
http://www.awce.com
by wd5gnr
Fri Jan 30, 2004 5:38 am
Forum: General Discussion
Topic: Resistor keys
Replies: 15
Views: 2066

Re: Resistor keys

For a simple circuit I would also do this with a bridge. However, for microprocessor devices without A/D it is still easy to do this without an A/D.<p>You can hook the resistor up to a capacitor. Suppose the resistor connects between +5V and the capacitor. The capacitor connects from the resistor to...
by wd5gnr
Fri Jan 30, 2004 4:29 am
Forum: Computer Programming
Topic: PBASIC II programming
Replies: 2
Views: 1558

Re: PBASIC II programming

I'm not sure I completely understand your question. The BS2 can use otherwised unused program space to save data. So presumably the answer is yes.<p>However, there are practical problems. Write to EEPROM is not very fast, so if you were trying to capture, say, 9600 baud data coming in large chunks, ...
by wd5gnr
Wed Jan 21, 2004 5:49 am
Forum: General Discussion
Topic: Microcontroller Networking
Replies: 1
Views: 528

Re: Microcontroller Networking

I'm not familiar with that particular board. However, what you want to do is possible (my book, Embedded Internet Design from McGraw Hill) shows several similar examples based around a TINI and a Javelin Stamp from Parallax.<p>Java is the easiest way (in my mind) to write network code for the PC. If...
by wd5gnr
Wed Jan 21, 2004 5:46 am
Forum: General Discussion
Topic: Old Question Hoping for Fresh Answer
Replies: 4
Views: 652

Re: Old Question Hoping for Fresh Answer

I don't know how far it is for you (but it has to be closer than Ca) but if you take a road trip to Dayton Ohio, Mendelson's http://www.meci.com/ is amazing. They have one entire floor devoted to electronic stuff and it is nothing short of amazing. You can't get a feel for the scope of it unless you...
by wd5gnr
Fri Jan 16, 2004 7:58 am
Forum: Computer Programming
Topic: pic c compilers
Replies: 3
Views: 2372

Re: pic c compilers

For my money, the PIC 16 family's architecture is too odd for C. Yes, you can get C compilers but they aren't terribly efficient to me. Now the 18F -- that's a different story. For the 16's Basic is a good fit since the internal architecture maps well into the "virtual" architecture.<p>That being sa...