Subject:
|
Re: how many servos on handyboard?
|
Newsgroups:
|
lugnet.robotics.handyboard
|
Date:
|
Wed, 17 May 2000 05:06:09 GMT
|
Original-From:
|
Will Bain <willb@selwaySTOPSPAMMERS.umt.edu>
|
Viewed:
|
623 times
|
| |
|
|
Vic wrote:
>
> I'd like to know how many servos the handy board can control. On the FAQ it
> says 2, in the documentation it says 4 DC motors. what's the deal? (am I
> stupid? I'm new at this)
The deal is this: Servos are different from plain old DC motors. They have gearing and position control circuitry built in.
There are four DC motor ports on the basic HB, but no ready-made servo ports. The dual servo routine described on the HB web site makes use of Port A bit 7 (aka digital port 9) and Port A bit 5 (on the expansion bus (back edge of board, under the LCD)).
> also, when you plug an expansion board, do you get 6 EXTRA servos? or those
> are the only ones you can still use? How about the rest? do all imputs
> remain free on the handyboard and everything on the expansion board is
> extra? than you.
I think you could in fact get six *extra* servos. The expansion board doesn't affect the use of Port A bit 7 (aka digital port 9), and I saw instructions on the HB web site (Software Contributed section) on how to use the piezo beeper to control a servo, too. The expansion board does occupy the expansion bus, though, precluding the use of Port A bit 5. Still, I think you could run eight servos with the exp. board. Should probably use a separate battery pack.
If you want to run a lot of servos, try using a serial servo controller (SSC). Check out the offerings at http://www.seetron.com/. Each SSC can run up to eight servos, and you can daisy chain a bunch of SSCs together to run up to 256 servos. The SSCs can be plugged into Port A bit 7 (aka digital port 9). Instructions are on the HB web site. Best of luck!
-- Will
+---------------------------------------------------------+
| ^^ <^ ^> |
| / òó ó°° \ |
| / =Y= U \ |
| Wendy, Will, Tatoosh & Tenzing |
+---------------------------------------------------------+
If you steal from one author, it's plagiarism; if you steal
from many, it's research. -- Wilson Mizner
|
|
Message is in Reply To:
 | | how many servos on handyboard?
|
| I'd like to know how many servos the handy board can control. On the FAQ it says 2, in the documentation it says 4 DC motors. what's the deal? (am I stupid? I'm new at this) also, when you plug an expansion board, do you get 6 EXTRA servos? or those (...) (24 years ago, 16-May-00, to lugnet.robotics.handyboard)
|
4 Messages in This Thread:
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
