Alt-BEAM Archive
Message #05679
To: beam@sgiblab.sgi.com
From: Richard Piotter richfile@rconnect.com
Date: Thu, 12 Aug 1999 23:14:26 -0500
Subject: [alt-beam] 245 reverser
Ah, but this is a stand alone reverser that will do two motors, and can
be used with a microcore... I think.
Will the 245 drive BG Micro motors, or do i need to stack?
Do both motors reverse??? I'll have to have at least 2 motors able to
reverse, but they have to work separately. Will I need 2 circuits, and
if so, can I double the chip by using the pins not used for the other
motor. I assume yes though.
I've actualy NEVER built a 245 motor driver, though I have used 2 or 3
arrangements of H-Bridges and a darlington controled switch.
I have a week to build this. I'm not yet sure if I'm using the branched
Bicore or a Standard Microcore. If I do the microcore, I'll try the
instant start thing. I'll have to dig up the saved messages (hey my
inbox used to hold 1800 messages till I cleaned it up! :)
SG wrote:
>
> WOW! a whole OTHER ic chip for just a reveser?
> the 74HCT240 that Ian uses on his master slave bicore
> only uses one resistor and a 40 uf cap.
> hmmm... looks complecated!
>
> At 07:25 PM 8/12/99 -0700, you wrote:
> >Richard Piotter wrote:
> >
> >
> >Personaly, I wanted to enter, but I havn't ordered parts in the longest
> >time!!! Sucks! also, is there a good 245 based reverser circuit??? If
> >so, then maybe I can build hexapod before the robotics meeting next
> >Thursday at St. Paul MN.
> >
> >--------------------------------------------------------------------
> >
> >Here you go Richard
> >
> >I designed this one specially for you. So no more excuses for not finishing
> >Hexapod!
> >
> >The G input disables all outputs when the PNC is active high. The D input
> affects
> >only the M1 outputs by reversing the connections between Nv1 and Nv3.
> >A 74AC245 can drive small motors (ie BG Micro Lens motor) directly but a
> >74HC/HCT245 will require h-bridges where the M1/M2 motors are shown.
> >At +V=5V, the total supply current increases by 1mA.
> >
> >enjoy
> >
> >wilf
> >
> >Attachment Converted: "c:\pipeplus\eudora\attach\245REV.gif"
> >
--
Richard Piotter
richfile@rconnect.com
The Richfiles Robotics & TI web page:
http://richfiles.calc.org
For the BEAM Robotics list:
BEAM Robotics Tek FAQ
http://people.ne.mediaone.net/bushbo/beam/FAQ.html
5680 Thu, 12 Aug 1999 23:14:14 -0500 [alt-beam] Re: LEM videos now on-line. beam@sgiblab.sgi.com Richard Piotter Ah, but this is a stand alone reverser that will do two motors, and can
be used with a microcore... I think.
Will the 245 drive BG Micro motors, or do i need to stack?
Do both motors reverse??? I'll have to have at least 2 motors able to
reverse, but they have to work separately. Will I need 2 circuits, and
if so, can I double the chip by using the pins not used for the other
motor. I assume yes though.
I've actualy NEVER built a 245 motor driver, though I have used 2 or 3
arrangements of H-Bridges and a darlington controled switch.
I have a week to build this. I'm not yet sure if I'm using the branched
Bicore or a Standard Microcore. If I do the microcore, I'll try the
instant start thing. I'll have to dig up the saved messages (hey my
inbox used to hold 1800 messages till I cleaned it up! :)
SG wrote:
>
> WOW! a whole OTHER ic chip for just a reveser?
> the 74HCT240 that Ian uses on his master slave bicore
> only uses one resistor and a 40 uf cap.
> hmmm... looks complecated!
>
> At 07:25 PM 8/12/99 -0700, you wrote:
> >Richard Piotter wrote:
> >
> >
> >Personaly, I wanted to enter, but I havn't ordered parts in the longest
> >time!!! Sucks! also, is there a good 245 based reverser circuit??? If
> >so, then maybe I can build hexapod before the robotics meeting next
> >Thursday at St. Paul MN.
> >
> >--------------------------------------------------------------------
> >
> >Here you go Richard
> >
> >I designed this one specially for you. So no more excuses for not finishing
> >Hexapod!
> >
> >The G input disables all outputs when the PNC is active high. The D input
> affects
> >only the M1 outputs by reversing the connections between Nv1 and Nv3.
> >A 74AC245 can drive small motors (ie BG Micro Lens motor) directly but a
> >74HC/HCT245 will require h-bridges where the M1/M2 motors are shown.
> >At +V=5V, the total supply current increases by 1mA.
> >
> >enjoy
> >
> >wilf
> >
> >Attachment Converted: "c:\pipeplus\eudora\attach\245REV.gif"
> >
--
Richard Piotter
richfile@rconnect.com
The Richfiles Robotics & TI web page:
http://richfiles.calc.org
For the BEAM Robotics list:
BEAM Robotics Tek FAQ
http://people.ne.mediaone.net/bushbo/beam/FAQ.html
5681 Thu, 12 Aug 1999 21:40:43 -0700 [alt-beam] Re: LEM videos now on-line. beam@sgiblab.sgi.com Sean Rigter The man says he's only got 245s and needs a reverser: 245s are normally used as
drivers for microcores. I combined the reverser with the driver : that's the
best I can do. Sorry no room for a Bicore.
enjoy
wilf
SG wrote:
> WOW! a whole OTHER ic chip for just a reveser?
> the 74HCT240 that Ian uses on his master slave bicore
> only uses one resistor and a 40 uf cap.
> hmmm... looks complecated!
>
> At 07:25 PM 8/12/99 -0700, you wrote:
> >Richard Piotter wrote:
> >
> >
> >Personaly, I wanted to enter, but I havn't ordered parts in the longest
> >time!!! Sucks! also, is there a good 245 based reverser circuit??? If
> >so, then maybe I can build hexapod before the robotics meeting next
> >Thursday at St. Paul MN.
> >
> >--------------------------------------------------------------------
> >
> >Here you go Richard
> >
> >I designed this one specially for you. So no more excuses for not finishing
> >Hexapod!
> >
> >The G input disables all outputs when the PNC is active high. The D input
> affects
> >only the M1 outputs by reversing the connections between Nv1 and Nv3.
> >A 74AC245 can drive small motors (ie BG Micro Lens motor) directly but a
> >74HC/HCT245 will require h-bridges where the M1/M2 motors are shown.
> >At +V=5V, the total supply current increases by 1mA.
> >
> >enjoy
> >
> >wilf
> >
> >Attachment Converted: "c:\pipeplus\eudora\attach\245REV.gif"
> >
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