Re: TI-H: Radio Link

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Radio Link
From: Bryan Rittmeyer <bryanr@flash.net>
Date: Sun, 26 Apr 1998 21:14:42 -0400
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
References: <v02110104b1693dec1bb8@[206.149.127.65]>
Reply-To: ti-hardware@lists.ticalc.org

Welp, I unsubscribed from the spam list formerly known
as TI-H, and I know that flash.net has a lot of problems
with e-mail. I should be getting an account at pair.com
soon (for the EII site) and they also give out e-mail.

As for the old firmware that I sent you, that version
was ancient with tons of bugs in the TI send/rec routines...
I had to add quite a few nops to get it slow enough to work
with a 1 MHz crystal... the AVRs are very fast chips!

I'd love to see what you ended up with, if you want to send
me your firmware. I will definitely be finishing the project
myself, and I won't steal your work. You can send it after
I'm done if you want.

I suggest you sell those radio modems as is, with RS-232
support. A lot of people on the list would kill for something
like that for so cheap! Then you could use the EII, or
an AVR-Based graphlink clone (something Grant or I could whip
up in under 10 minutes, no doubt) to convert from TI to RS-232.

The whole goal of the EII is to provide a modular development
platform so that people can realize some of their more
advanced ideas.

You reversed the per-cycle times for the AVR and PIC, by the way.
The PIC is about 200ns, the AVR is around 62.5. Time = 1 / Frequency.
:-)

Just so the rest of the people on the list know, the EII site is now
mirrored at http://www.bridges.edu/horizon/eii/ The site was down
earlier
today due to a nuke (thank the AOL lewzers...) but should be online now.
The horizon.dyn.ml.org/eii/ site still works, and I should have a
www.pair.com
mirror in the future.

Bryan

Grant Stockly wrote:
> 
> Does your e-mail still not work bryan?  I've tried about 5 times to contact
> you about your beta EII design.  Its not the crystal thats too fast, its
> the code...  In some places an extra delay routine was needed...  Also, one
> of your delay routines didn't take in account that the AVR operates at
> 100nsec and the pic at 62.5 (or close) at 10MHz.  Fixing that and a few
> other things made the thing work fine for me...
> 
> I guess you are still trying to release it?  What evers up with it, I guess
> you and not me are going to release it...  Did you realy never get any of
> my e-mails?  I've sent you about 5 which told about what was wrong...  In
> one of them I enclosed a working firmware design to work with 10MHz.
> 
> Basically, if you want, I've got an EII...  :)  <grant is feeling almighty
> and powerful>  <j/k>
> 
> >Care to provide us with a phone number and/or
> >URL?
> >
> >Bryan
> >
> >Grant Stockly wrote:
> >>
> >> >>Its a matter of bargining with the company that makes them...  I bought
> >> >>one, modified it, and then it worked...
> >> >
> >> >
> >> >Oh. . .
> >> >
> >> >Maybe I could get one (me where) and pull a Rich and map it out :)  Unless
> >> >he wants to do it. . .
> >>
> >> I'm doing that right now...  It appears to operate at about 380 MHz so its
> >> probably in the ham radio band somewhere...  It is low power enough so taht
> >> you can use it wiothout a lisense though...  It is possible to use an amp
> >> to it...  :)

References:

Re: TI-H: Radio Link

From: gussie@alaska.net (Grant Stockly)