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PICList Thread
'[OT] Design Idea'
2000\02\10@161759 by Jim Hartmann

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My "design idea" appears in Jan 20 EDN p. 122.  Left side is a PIC in the
real application.  The editor messed up the grammer a little.  Vote for me
if you like the design!  I promised to buy my co-workers a round of beer if
I win.

Cheers,
Jim H.

2000\02\10@163420 by jamesnewton

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Its a (very) little known tradition on the PICList that if a design which
was assisted in any way by the PICList members wins a design contest
involving any significant financial gain, the (<COUGH> lead) designer must
buy the ENTIRE LIST a round of beers (or soda for us non-drinkers).

P.S. current membership is about 1900.

---
James Newton (PICList Admin #3)
spam_OUTjamesnewtonTakeThisOuTspampiclist.com 1-619-652-0593
PIC/PICList FAQ: http://www.piclist.com or .org

-----Original Message-----
From: pic microcontroller discussion list
[.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU]On Behalf Of Jim Hartmann
Sent: Thursday, February 10, 2000 13:14
To: PICLISTspamKILLspamMITVMA.MIT.EDU
Subject: [OT] Design Idea


My "design idea" appears in Jan 20 EDN p. 122.  Left side is a PIC in the
real application.  The editor messed up the grammer a little.  Vote for me
if you like the design!  I promised to buy my co-workers a round of beer if
I win.

Cheers,
Jim H.

2000\02\10@192308 by Tom Handley

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  Hey Jim, congrats! I saw the article but I didn't connect the name. I was
especially interested in it since I recently used 74HC595's in a `just for
the fun of it' personal hack. My mother had an old Sears/GRE SBE OptiScan
radio scanner that only goes from 30 MHz to 510 MHz. You had to punch holes
in a card to set up to 16 frequencies per card. Well I was bored... and I've
been wanting a fancy Trunk-Hunting Scanner but I couldn't afford one right
now. So I spent `more time than humans should be allowed' and figured out
how to program the synthesizer. Basically, I intercepted the synthesizer's
switching transistor's base resistors and connected them to two '595s. I
used a PIC16F876 to control a Keypad, LCD, and the Scanner as well as an
interface to a PC. I used the internal EEPROM to store channel programming
data, lockout, and alarm status. I had literally just finished the
Scanner/PIC side of the code when I saw your article! Your idea is very
clever! You got my vote and if I miss out on the beer, I'll buy if you ever
get to Portland, OR ;-)

  BTW, this Scanner thing is the first `just for fun' thing I've done in
years. I even built some antennas having to `blow the dust off' an old ARRL
Antenna Book and ITT's Reference Data For Radio Engineers. Heck, it took
longer to make the interface cables and figure out an equation for entering
frequency as opposed to the 16-Bit punch-card holes, than to write the code!
I found a convenient Squelch signal and buffered that with an Op Amp
configured as a comparator with a 1V hysteresis. I'm using a standard 4x20
LCD display with channel, frequency, lockout/alarm status, and a scrolling
channel display that mimics the the LED's on the Scanner except each bank is
20 channels. Right now, it supports 80 channels, provides lockout, alarm,
search, search-skip, and manual select/step functions. I'm working on a PC
interface. All in all, I've spent about (aboot for our Canadian friends ;-)
two weeks on this. Unfortunately, I have to get back to other projects...
Sorry to `babble' but the timing was perfect.

  The only time I've been mentioned in EDN was as a runner-up in the
"Name that Widget" contest back in one of the December 98 issues ;-)

  - Tom

At 03:13 PM 2/10/00 -0600, Jim Hartmann wrote:
>My "design idea" appears in Jan 20 EDN p. 122.  Left side is a PIC in the
>real application.  The editor messed up the grammer a little.  Vote for me
>if you like the design!  I promised to buy my co-workers a round of beer if
>I win.
>
>Cheers,
>Jim H.


------------------------------------------------------------------------
Tom Handley
New Age Communications
Since '75 before "New Age" and no one around here is waiting for UFOs ;-)

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