Alt-BEAM Archive
Message #06929
To: beam@sgiblab.sgi.com
From: SG Sparkyg@seark.net
Date: Thu, 21 Oct 1999 00:51:17 -0400
Subject: [alt-beam] Re:#2 What The...! My Bot Is On Drugs!
oops, .. i fergot.
no, I don't think the battery was hot, but then again, i didn't take it off
right away either...
-Sparky
At 09:14 PM 10/19/99 -0700, you wrote:
>I know I'm repeating myself Sparky but then you asked for it: HC
>bicores are and always have been slower than HCT bicores. Perfectly
>predictable and I could tell you exactly why in detail but read it for
>yourself in the archive. The motors run longer in each direction and you
>get higher "slo mo" steps. So how to speed things up and get the big
>steps to boot? Reduce the resistors and increase the voltage.
>Now the battery: Was it hot after the 5 minute discharge?
>
>regards
>
>wilf
>
>SG wrote:
>
>> Ok, i was havin a little troouble with an h-bridge that kept
>> burning out, so i decided to approach the problem in a
>> different way.
>> I have been using the 74HCT240 for my Master/Slave Bicore
>> (Ian's "Compleate Walker Circuit") and read somewhere that
>> the AC or HC was preferable over the HCT. so i ordered a
>> few 74HC240's from bgMicro. (couldn't find the AC's)
>> well, i popped one in there and WOAAAA MOMMMA!
>> what the heck is happinin??!!????! MY BOT IS ON DRUGS!!!!
>> the steps were MUCH higher, but the whole bot ran like
>> it was in a slow motion movie.... had to adjust a pot i had on the
>> front servo to get the walking gait straight. Every few
>> strides the bot would stop alltogether for about 2 secs.
>> after about five mins of playing around and trying to
>> tweak it, the thing RAN DOWN my fully charged battery!
>> (I was mad too! cause these things take 14 hrs to charge,
>> and now i can't play with my bot anymore tonight cause i
>> didn't charge up my spare!)
>> What happened? i sure don't know! the new HC's i have are numbered
>> SN74HC240N
>> (hmmmm.. a few extra letters there...)
>> weird man weird. ...bummer.
>> -Sparky
>
>
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