Alt-BEAM Archive
Message #13717
To: beam@sgiblab.sgi.com
From: SkavenArmy@cs.com
Date: Thu, 20 Apr 2000 01:16:16 EDT
Subject: Re: Solarizing
has anyone ever used trimpots for all the resistors????that would make some
difinatelyy non pretty bots , bt really adjustable
13718 Wed, 19 Apr 2000 23:28:04 -0600 Re: Servo Controler beam@sgiblab.sgi.com Dave Hrynkiw At 09:39 PM 4/19/2000 , Richard Piotter wrote:
>The one limitation, unfortunately, is I do NOT want to modify the servos.
>
>My question is how stable is the frequency that a bicore produces. I
>want it to generate the PWM to drive the servo. I want to use a variable
>bias with 2 inputs that would have 4 actions. Hold servo, CW, Center,
>CCW. The 3 positional actions would be adjustable by variable resistors,
>so the system could be fine tuned. The 4th pulse would need to stop the
>bicore.
The 240 works quite well in this application. We've developed something we
call a "servocore" module that is slavable, and has adjustable the CW and
CCW settings. Interfaces quite well with a MSE (Miller Solarengine) too.
There isn't a center frequency adjust tho.... yet. This'll be part of the
micro/bicore experimenter's kit we're still putting together.
As for your "hold" function - you mean you want it to shut down the driver,
or sent the frequency at an arbitrary point so it "locks" in place?
When I can put the notes together, I'll post the schematic. I'm busy doing
BEAM GAMEs stuff right (writing rules... ;>
Regards,
Dave
---------------------------------------------------------------
"Um, no - that's H,R,Y,N,K,I,W. No, not K,I,U,U, K,I,_W_. Yes,
that's right. Yes, I know it looks like "HOCKYRINK." Yup, only
2 vowels. Pronounciation? _SMITH_".
http://www.solarbotics.com
13719 Wed, 19 Apr 2000 22:43:56 -0700 Re: Photopopper answers from Ben beam@corp.sgi.com Ken Hill Thanks Ben! Making much more sense now!
[snip]
>> (Photopopper drawing shows the wires crossing near 1381s but not sure if
>> they are connected at that junction).
After further study, I'm thinking that junction must be connected or the
PDs wouldn't have any effect on the 1381 (am I right?)
>>
>> And lastly, is the RC timer (if that's what it is?) used to keep the motor
>> from firing for a while assuring the turn or what?
>Eh? RC networks? Where? The cap on the trigger of the 1381 is there to
>allow different resistances of light sensor to have some effect... This is
>an RC network I guess, but only if you replace the Photodiode with a LDR.
>Is this what you're talking about? If so then yes the RC time constant is
>affected by light, therefore the popper will be affected by light and will
>either turn away or come towards the light.
[snip]
Oh...I saw the .22 cap and 680k resistor to ground on the feeler switch and
thought it was an R/C timeout for the turn action of the switch like other
bots I've seen have. I'm learning :)
Thanks again; Ken
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