Handy Board : 6005


Robotics / Handy Board / 6005	6004 \| 6006

Subject:	Re: Increasing current output to motors on HandyBoard
Newsgroups:	lugnet.robotics.handyboard
Date:	Fri, 9 Apr 1999 15:01:50 GMT
Original-From:	MAR ERICSON <MAR@COOPER.EDUstopspammers>
Viewed:	774 times

I wonder if this would last since a relay is mechanical and I would assume that it would wear with all that "switching". Doe anyone have any experience with this? Thanks. ----------- ericson mar Robotics Consultant mar@cooper.edu (212)353-4356 Department of Mechanical Engineering The Cooper Union for the Advancement of Science and Art ------------------------------------------------------- On Thu, 8 Apr 1999, Gary Livick wrote: > Another solution to this which is easier but more expensive is to use the > output of the motor driver chip to drive solid state relays. You need the > relays that use 5 volts for control and that will switch DC. The relays I use > have flyback diodes in them, but I don't know that all do so a user would need > to add them if they were not included. > > Four are needed. > > Gary Livick > > > Chuck McManis wrote: > > > At 11:46 PM 4/8/99 -0400, Ian Nieves wrote: > > > ...Is there > > > some stacking that would allow more current to pass safely? (I am > > > looking for a relatively simple solution that can be implemented quickly > > > and easily.) Can i stack two TI sn754410ne on top of each other? > > > > Stacking the chips is doable but you will toast them when you get near > > their current limit. An easier solution is to use the TI chips to drive > > power transistors that are acting as voltage followers. This lets them take > > the current. Alternatively you can pull the L293 chips out of the board and > > wire the sockets up to some National LM18200 H-bridges that will handle > > these motors at 12volts. > > > > --Chuck > >

Message has 1 Reply:

		Re: Increasing current output to motors on HandyBoard
Haven't actually tried it, but I was thinking of the same sort of thing. Use a FET for PWM and a DPDT relay for direction. practically speaking, if you only switched the relay when the FET was off, no power transition, etc.... If your 'bot moves (...) (25 years ago, 10-Apr-99, to lugnet.robotics.handyboard)

Message is in Reply To:

		Re: Increasing current output to motors on HandyBoard
Another solution to this which is easier but more expensive is to use the output of the motor driver chip to drive solid state relays. You need the relays that use 5 volts for control and that will switch DC. The relays I use have flyback diodes in (...) (25 years ago, 9-Apr-99, to lugnet.robotics.handyboard)

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