Alt-BEAM Archive
Message #06891
To: beam@sgiblab.sgi.com
From: SG Sparkyg@seark.net
Date: Wed, 20 Oct 1999 00:05:06 -0400
Subject: [alt-beam] What The...! My Bot Is On Drugs!
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
Home