Handy Board : 6015


Robotics / Handy Board / 6015	6014 \| 6016

Subject:	Re: Increasing current output to motors on HandyBoard
Newsgroups:	lugnet.robotics.handyboard
Date:	Sat, 10 Apr 1999 01:57:17 GMT
Original-From:	MAR ERICSON <mar@IHATESPAMcooper.edu>
Viewed:	964 times

So that's like $28 for the H excluding the protecting circuitry? How much did this setup cost for both motors? ----------- 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 Fri, 9 Apr 1999, Gary Livick wrote: > Howdy, > > My original suggestion was to use *solid state* relays. They don't have any > contacts. I use them plugged right into my Rug Warrior board at the motor output > ports (would work the same on my Handy Board, but I have it on a smaller base, and > the L293D is big enough for that). The relays switch very fast, being solid state. > They are rated at 6 amps at 36 volts, and were $7 each. Smaller ones are less > expensive, but their main advantage is ease of use. > > Gary Livick > > > K.L.McKinnon wrote: > > > 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 forward more than back than using a default state > > (N/C) for the forward motion, means current to the relay is only > > consummed during the reverse movement. > > A single FET with a relay s(w)hould prove to be quite a bit more space > > conservative and likely cost effective as well. > > Comments? > > > > K.L. McKinnon > > > > MAR ERICSON wrote: > > > > > > 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 > >

Message has 1 Reply:

		Re: Increasing current output to motors on HandyBoard
Total cost for both, $56.00. Smaller ones are cheaper. Again, the advantage is convenience, not cost. These pulg right into the motor driver output ports on either the Handy Board or the Rug Warrior with the L293D left in place, and take no other (...) (25 years ago, 10-Apr-99, to lugnet.robotics.handyboard)

Message is in Reply To:

		Re: Increasing current output to motors on HandyBoard
Howdy, My original suggestion was to use solid state relays. They don't have any contacts. I use them plugged right into my Rug Warrior board at the motor output ports (would work the same on my Handy Board, but I have it on a smaller base, and (...) (25 years ago, 10-Apr-99, to lugnet.robotics.handyboard)

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