Sign in

username:

password:



Not a member?

Search piclist



Search tips

Subscribe to piclist



piclist by Keywords

12F675 | 16F628 | 16F84 | 16f877 | 16F877A | 16F88 | 18F458 | ADC | AVR | Bootloader | CAN | CCS | CRC | EAGLE | EEPROM | ICD | ICSP | IDE | JDM | LED | Macros | Microchip | MPLAB | PCB-CAD | PIC10F | Pic12f675 | PIC16F84 | PIC16F84A | PIC16F877 | PIC18 | PIC18F452 | PicBasic | PICC | PICSTART | PWM | RS-485 | RS232 | SMT | SPI | UART | USART | USB | Wireless | Wisp628 | Xilinx

Ads

Discussion Groups

Discussion Groups | Piclist | Re: HELP!!!!!!need to control 4.8v dc motors

A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.

Re: HELP!!!!!!need to control 4.8v dc motors - Emmanuel Gonzalez - Aug 22 8:53:00 2003

i suggest that you buy another h-bridge that will be compatible with your dc
motors...try using A3951 pwm motor driver from Analog Devices...they are
suitable for motors like yours...
---------------------------------------------------------
Emmanuel A. Gonzalez
IEEE Student Member
>From: "shaunundergrad" <>
>Reply-To:
>To:
>Subject: [piclist] HELP!!!!!!need to control 4.8v dc motors
>Date: Fri, 22 Aug 2003 09:55:37 -0000
>MIME-Version: 1.0
>X-Originating-IP: 195.93.33.8
>Received: from ruebert.ieee.org ([140.98.193.10]) by
>mc8-f1.law1.hotmail.com with Microsoft SMTPSVC(5.0.2195.5600); Fri, 22 Aug
>2003 02:58:49 -0700
>Received: from orion2.ieee.org (gemini3.ieee.org [140.98.193.188])by
>ruebert.ieee.org (Switch-3.1.0/Switch-3.1.0) with ESMTP id
>h7M9tqYr020928for <>; Fri, 22 Aug 2003 05:56:51 -0400
>(EDT)
>Received: from n17.grp.scd.yahoo.com (n17.grp.scd.yahoo.com
>[66.218.66.72])by orion2.ieee.org (Switch-2.2.6/Switch-2.2.6) with SMTP id
>h7M9toY01293for <>; Fri, 22 Aug 2003 05:55:50 -0400
>(EDT)
>Received: from [66.218.66.157] by n17.grp.scd.yahoo.com with NNFMP; 22 Aug
>2003 09:55:49 -0000
>Received: (qmail 97751 invoked from network); 22 Aug 2003 09:55:48 -0000
>Received: from unknown (66.218.66.217) by m17.grp.scd.yahoo.com with QMQP;
>22 Aug 2003 09:55:48 -0000
>Received: from unknown (HELO n12.grp.scd.yahoo.com) (66.218.66.67) by
>mta2.grp.scd.yahoo.com with SMTP; 22 Aug 2003 09:55:48 -0000
>Received: from [66.218.66.121] by n12.grp.scd.yahoo.com with NNFMP; 22 Aug
>2003 09:55:37 -0000
>X-Message-Info: JGTYoYF78jG9gBgQbOOaysci+048mKgr
>X-eGroups-Return:
>
>X-Sender:
>X-Apparently-To:
>Message-ID: <>
>User-Agent: eGroups-EW/0.82
>X-Mailer: Yahoo Groups Message Poster
>X-Yahoo-Profile: shaunundergrad
>Mailing-List: list ; contact
>
>Delivered-To: mailing list
>Precedence: bulk
>List-Unsubscribe: <mailto:>
>Return-Path:
>
>X-OriginalArrivalTime: 22 Aug 2003 09:58:50.0701 (UTC)
>FILETIME=[FCC8DFD0:01C36893]
>
>hi guys,
>
>i've made a mistake and bought 2 4.8v dc motors that are too big for
>my 'h' bridge ic....these are motors that will probably run at 2a
>normal load, stall current 7a. i don't know what i need to control
>this amount of power, any help appreciated....needs to be reasonably
>simple only home project to help me learn pics in preperation for
>next semesta
>
>best regards
>
>shaun >
>to unsubscribe, go to http://www.yahoogroups.com and follow the
>instructions _________________________________________________________________
MSN 8 with e-mail virus protection service: 2 months FREE*
http://join.msn.com/?page=features/virus



(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )


Re: HELP!!!!!!need to control 4.8v dc motors - Chad Russel - Aug 22 11:32:00 2003

Emmanuel,

I don't find A3951 at the AD website. You have a better number?

Shaun,

Don't know what your circuit looks like, but grab some cheap MOSFETs
and a dual high-side MOSFET driver from Linear Tech. I'm sure LT has
lot of sample applications.
http://www.linear-tech.com/pub/q_srch.html?target=MOSFET+driver&x=24&y=9&pub_type=All&product_family=All

Chad

--- Emmanuel Gonzalez <> wrote:
> i suggest that you buy another h-bridge that will be compatible with
> your dc
> motors...try using A3951 pwm motor driver from Analog Devices...they
> are
> suitable for motors like yours... >
> ---------------------------------------------------------
> Emmanuel A. Gonzalez
> IEEE Student Member ***** SNIP *****
> >
> >hi guys,
> >
> >i've made a mistake and bought 2 4.8v dc motors that are too big for
> >my 'h' bridge ic....these are motors that will probably run at 2a
> >normal load, stall current 7a. i don't know what i need to control
> >this amount of power, any help appreciated....needs to be reasonably
> >simple only home project to help me learn pics in preperation for
> >next semesta
> >
> >best regards
> >
> >shaun
> >
> >
> >
> >to unsubscribe, go to http://www.yahoogroups.com and follow the
> >instructions
> >
> >
> >
> >
>
> _________________________________________________________________
> Help STOP SPAM with the new MSN 8 and get 2 months FREE*
> http://join.msn.com/?page=features/junkmail

__________________________________


(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

Re: HELP!!!!!!need to control 4.8v dc motors - Author Unknown - Aug 22 11:49:00 2003

don't have circuit as such, was driving 'h' bridge direct with 12f675 pwm output, i'm gonna have to learn transistors/mosfets, i knew i was going to have to anyway. just wanted to learn assembly first, then get robot thing to move around as i had planned (just to check program objective correct). didnt realise component electronics and pics both go hand in hand(naive i know), thought it would be a bit more modular like plc's.
already got power mosfet's (buk545) just need to suss how to wire them!!!!

regards

shaun

Attachment (not stored)
Sixties Sunflowers .jpg
Type: image/jpeg



(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

Re: HELP!!!!!!need to control 4.8v dc motors - rtstofer - Aug 22 16:23:00 2003


You might want to consider the National Semiconductor LMD18200 3A 55V
H-Bridge available at www.acroname.com. This device is self-
protecting so it should be able to handle the peak currents with no
ill effects. --- In , Chad Russel <chadrussel@y...> wrote:
> Emmanuel,
>
> I don't find A3951 at the AD website. You have a better number?
>
> Shaun,
>
> Don't know what your circuit looks like, but grab some cheap MOSFETs
> and a dual high-side MOSFET driver from Linear Tech. I'm sure LT
has
> lot of sample applications.
> http://www.linear-tech.com/pub/q_srch.html?
target=MOSFET+driver&x=24&y=9&pub_type=All&product_family=All
>
> Chad
>
> --- Emmanuel Gonzalez <emmanuel_g@i...> wrote:
> > i suggest that you buy another h-bridge that will be compatible
with
> > your dc
> > motors...try using A3951 pwm motor driver from Analog
Devices...they
> > are
> > suitable for motors like yours...
> >
> >
> >
> > ---------------------------------------------------------
> > Emmanuel A. Gonzalez
> > IEEE Student Member
> >
> >
> ***** SNIP *****
> > >
> > >hi guys,
> > >
> > >i've made a mistake and bought 2 4.8v dc motors that are too big
for
> > >my 'h' bridge ic....these are motors that will probably run at 2a
> > >normal load, stall current 7a. i don't know what i need to
control
> > >this amount of power, any help appreciated....needs to be
reasonably
> > >simple only home project to help me learn pics in preperation for
> > >next semesta
> > >
> > >best regards
> > >
> > >shaun
> > >
> > >
> > >
> > >to unsubscribe, go to http://www.yahoogroups.com and follow the
> > >instructions
> > >
> > >
> > >
> > >
> >
> > _________________________________________________________________
> > Help STOP SPAM with the new MSN 8 and get 2 months FREE*
> > http://join.msn.com/?page=features/junkmail
> >
> > __________________________________



(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

Re: HELP!!!!!!need to control 4.8v dc motors - tfrohaly - Aug 25 15:24:00 2003

--- In , Chad Russel <chadrussel@y...> wrote:
> Emmanuel,
>
> I don't find A3951 at the AD website. You have a better number?

He made a mistake - it's not Analog, it's Allegro.
www.allegromicro.com

The A3951 is, however, a discontinued product. Also,
it can only drive 2A, 3.5A peak. I don't know what
the replacement is, but Allegro has a bunch of different
motor driver chips. A better choice is probably the
LMD18200 like Richard suggested. To go to higher
currents, you can build your own with MOSFETs. A nice
example (including schematics and gerbers) can be found at
http://www.mcmanis.com/chuck/Robotics/projects/servo.html

Tim.



(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )

Re: Re: HELP!!!!!!need to control 4.8v dc motors - Author Unknown - Aug 25 16:00:00 2003

hi guys,
thanx for tips i did manage to sort something out, i'm using a small signal mosfet to drive a power mosfet, i think this will work just waiting for my new pic chip to arrive as i fried mine, have to learn somehow. due tomorrow so i should see if my plan will work, i.e., use 12f675 with pwm module output to drive direct small signal mosfet which will drive direct a 20a power mosfet with 7v connected to source and motor between drain and 0v works ok on breadboard. my pwm is 1khz at 0.5v to 2.5v max out 25ma. all i want to do is drive the motors towards light using a ldr as the analogue input...simple i know but has a been a good way to self learn. could do with somebody going over my program to see if it can be improved for a faster pwm base frequency...only short and well documented, wouldn't take an experienced programmer too long to look....anybody willing i'll send it on as i don't think  attachments work on here.

best regards

shaun

Attachment (not stored)
Sixties Sunflowers .jpg
Type: image/jpeg



(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )