Subject:
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Re: Expansion Board
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 18 Mar 1996 14:29:13 GMT
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Original-From:
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Fred G. Martin <FREDM@nospamMEDIA.MIT.EDU>
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Viewed:
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2151 times
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Dear Luc,
Thank you for your feedback regarding the Expansion Board. (Other
users out there---what's going on?) To answer some of your questions:
>
> - Can't get the MAX662. more than 20 weeks to wait at digikey. anyone knows
> another source? thx.
you can try requesting a sample from maxim directly. They even let you
do it from their web site:
http://www.maxim-ic.com/index.html
>
> - I feel like the power diodes are too close on the PCB. There is also a risk
> of short circuit when you put the LCD back above.
Yes. Do you have a suggestion for how to fix this? There isn't much
space. I'm not sure what to do.
> - I think that there should be DIP sockets for all the ICs in the part list.
> When using sockets make sure to solder U3 BEFORE SW1.
Yes, the IC's should have sockets.
> - Where can one buy the polaroid sensor?
Polaroid
119 Windsor St,
Cambridge, MA 02139
tel: 617.577.4681
fax: 617.577.3213
tel: 800.225.1000 ordering
fax: 800.832.9003 ordering fax
tel: 800.225.1618 technical assistance
Polaroid Ultrasonic Components Group offers two ultrasonic ranging
kits:
Specs:
Distance range: 0.26 to 10.7 meters
Resolution: Nominal +- 3mm to 3m, +-1% over entire range
Resolution: Nominal +- 3mm to 3m, +-1% over entire range
Sonar acceptance angle: approx. 20 degrees
Power Requirement: 6VDC, 2.5 Amps (1 ms pulse), 150mA
quiescent
Weight: Transducer, 8.2gm, Ranging module, 18.4 gm
Designer's Kit:
1 transducer, 1 ranging module, electronics display accurate
to 1/10th meter. Cost is $169
OEM kit: (part #606783)
2 transducers, 2 ranging modules. $99.
this information is courtesy of Paul R. I ordered the OEM kit.
>
> I wish there was one or 2 more 374 latching the databus. I feel like the
> handy board is short of digital outputs.
Yes, it is a choice of inputs or outputs given the amount of space on
the expansion board. So, you would prefer that I provide one fewer
input chip and replace it with an output chip?
-Fred
--
This message was composed using Articulate Systems' PowerSecretary,
a Macintosh-based speech-to-text dictation system.
Please forgive any sloppiness in the formatting. Thanks. -Fred
> thanks again to all.
>
>
> Luc Barthelet.
>
>
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Message is in Reply To:
 | | Expansion Board
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| I built 2 of those. I continue to applaud everyone involved with this project . It is awesome. I know have 3 Handy boards and am teaching programming and robotics to my kids, i love it. I am also using it to control a 5DF motion controlled camera. (...) (29 years ago, 13-Mar-96, to lugnet.robotics.handyboard)
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