Subject:
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Re: HandyBoard 10-16 Servo support
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 13 May 1998 14:16:15 GMT
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Original-From:
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Skye Legon <slegon@watfast.uwaterloo.ca=AntiSpam=>
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Viewed:
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1201 times
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> Being a hardware novice, my question/problem is this: the 73HC154 demultiplexor
> provides "active-low" outputs in that all non-selected output lines are high
> rather than low as the servo's require. To use this chip then I will have to
> add 16 inverters which seems a waste.
>
> Is there a different demultiplexor that I can use to get "active-high" outputs
> to avoid the requirement of all the inverters?
I had exactly the same problem. There is a CMOS chip by Motorola called
the MC14028B that is a BCD-to-decimal or Binary-to-octal decoder. All
that really matters though is that it will take a 4-bit input and
decode up to *10* outputs that are *active high*. I know it is not
16 as desired, but if you can live with just ten, it should suit you
fine.
Good luck, Skye.
+-----------------------------------------+----------------------------+
| Skye Legon | University of Waterloo |
| Systems Design Engineering | __/ __/ __/ __/ |
| Pattern Analysis & Machine Intelligence | __/ __/ __/ __/ __/ |
| 143 Columbia St. West, Unit E-4 | __/ __/ __/ ____/ __/ |
| Waterloo Ontario CANADA N2L 3L2 | __/__/__/ __/__/\__/__/ |
| +1(519)888-9249 | ______/ ___/ \___/ |
| slegon@uwaterloo.ca | DC 2620, 888-4567 x5192 |
+-----------------------------------------+----------------------------+
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Message is in Reply To:
 | | HandyBoard 10-16 Servo support
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| I am trying to develop simple Hardware/Software to support up to 16 servos from the HandyBoard. A theoretical constraint of my plans is that only about 10 of the 16 connected servos will be able to actively hold position at one time. I plan to do (...) (26 years ago, 5-May-98, to lugnet.robotics.handyboard)
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