Re: TI-H: Drive-85

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Re: TI-H: Drive-85


Wow, is this going to be fun, or what!
Got the circuit?

Thanks alot to everyone answering!

On Fri, 20 Feb 1998 16:23:03 -0500 "Robert Brack" <reb@netride.com>
writes:
>
>For steering, instead of using servos, or low geared dc motors with 
>pots,
>you can use small stepper motors.  I also have a book on robots (I 
>doubt
>it's the same one) and it thoroughly describes steppers.  Steppers are 
>like
>4 motors in one.  If you apply voltage to one input (there are 4)  it 
>will
>move one notch and stop.  If you reverse polarity, it will revearse 
>and
>stop.  Steppers have built in brakes, you don't have to worry about it
>getting pushed out of place.  I can develope a circuit for you to try,
>moving no more than 50 degrees either way.  You can get a small 
>stepper
>motor for about $5 to $10.
>
>                                                                       
>     
>    -Robert Brack
>
>reb@netride.com
>
>-----Original Message-----
>From: Richard Piotter <richfiles1@hotmail.com>
>To: ti-hardware@lists.ticalc.org <ti-hardware@lists.ticalc.org>
>Date: Friday, February 20, 1998 11:23 AM
>Subject: Re: TI-H: Drive-85
>
>
>>
>>Fun! /:
>>
>>I suppose there are a few ways you could do it. First though, if you
>>write it in BASIC, you'll have to make up and more by writing the 
>driver
>>on a Microcontroler AND include a TI-Protocol translater that will
>>understand the get/send var routines, (which aren't the best on the
>>TI-85. I recomend ASM. Also, there are two ways to go about doing the
>>work. You could use direct buss access (connect data and address 
>wires
>>to the calc, using the TI-85 schematic on my page as a guide
>>
>>http://www.geocities.com/SiliconValley/Lakes/5081/Richfiles.html
>>
>>You would need to find some addresses that are not reserved for 
>anything
>>and come up with either a port or memory mapped I/O scheme for
>>connecting your external hardware. The second option is the "normal"
>>way, to conect stuff via the link port. You'll need to use a shift
>>register (probably) to get individual paralel I/O lines or you can 
>use
>>an I2C 8-bit paralel interface chip. If you want variable speed, go 
>with
>>the I2C (simpler circuit). Anyway, whichever you choose, you'll need
>>convert the signals to a higher voltage/curent to drive motors. You 
>can
>>use relays to control the direction of the motors, and I have book 
>that
>>shows how to make motor drives for robots. one system uses 
>transistors
>>and relays to drive 2 motors at various speeds. It's a simple 
>concept,
>>but the circuit is a little bit large. most of the designs will work
>>with just 8 bit data and only need a single line to access. That can 
>be
>>brought high if it's all that's there. If you need sensors, you can 
>also
>>connect those. If you'd rather have a stering mechanism, you can 
>either
>>use servos (expensive) or a low speed geared motor with a 
>potentiometer
>>attached. and A/D converter will allow the calc to check exactly what
>>angle it is at.
>>
>>I'll try to get you the title of the book and the author so you can 
>look
>>for it. I'll show you how to do the stuff you can't figure out. (If I
>>can figure it out!!! =)
>>
>>Richard Piotter
>>richfiles1@hotmail.com
>>
>>>
>>>
>>>Hello.
>>>
>>>I'm designing a robocar for the TI-85 to control, and would like to
>>know:
>>>
>>>Would using a counter and de-multplexer and a 'thingy' be a good 
>idea
>>>to turn the data coming out of the 85 into movement?
>>>
>>>What circuits could I use to turn the signals out of the de-multi 
>into
>>>motor movement?
>>>(the 'thingy' mentioned above)
>>>
>>>Is writing the control program in BASIC a sound idea?
>>>
>>>Thanks.
>>>
>>>Dave Goncalves
>>>n1xzb@juno.com
>>>
>>>p.s.  Did I mention that the 85 was going to be in the driver's seat 
>of
>>>the car, with
>>>a face on the LCD if possible.
>>>
>>>_____________________________________________________________________
>>>You don't need to buy Internet access to use free Internet e-mail.
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>>>
>>
>>
>>Richard
>>
>>______________________________________________________
>>Get Your Private, Free Email at http://www.hotmail.com
>>
>
>

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