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'Another bone-head newbie question'
1997\07\12@201707 by chao

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My dream is to build a hexapod robot but with 3 degrees of freedom on each
leg, 18 servos is a little out of my budget.  Is there any way to control
18 bipolar steppers from a Basic Stamp 2.  I would like to conserve I/O
pins too so a serial device would be perfect.
Thanx
Chiu Fang
spam_OUTchaoTakeThisOuTspamintergate.bc.ca

1997\07\12@205018 by Andy Kunz

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At 05:01 PM 7/12/97 -0700, you wrote:
>My dream is to build a hexapod robot but with 3 degrees of freedom on each
>leg, 18 servos is a little out of my budget.  Is there any way to control
>18 bipolar steppers from a Basic Stamp 2.  I would like to conserve I/O
>pins too so a serial device would be perfect.

Cheap but good servos are available from http://www.fmadirect.com

Tell them I sent you.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\07\13@202156 by Bob Blick

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Stepper motors use a lot of power and don't deliver much power. You'll have
to gear them down, what a lot of work. Servos are really much nicer, and a
Scott Edwards serial servo controller(or three) would make interfacing easy.

Do you have some algorithms in mind for dealing with 6 legs, 3 axes? It
seems a phenomenal task, but I'm not an inspired programmer.
-Bob

At 05:01 PM 7/12/97 -0700, you wrote:
>My dream is to build a hexapod robot but with 3 degrees of freedom on each
>leg, 18 servos is a little out of my budget.  Is there any way to control
>18 bipolar steppers from a Basic Stamp 2.  I would like to conserve I/O
>pins too so a serial device would be perfect.
>Thanx
>Chiu Fang
>.....chaoKILLspamspam@spam@intergate.bc.ca
>
>

http://www.bobblick.com/

1997\07\14@091134 by Andy Kunz

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At 05:18 PM 7/13/97 -0700, you wrote:
>Stepper motors use a lot of power and don't deliver much power. You'll have
>to gear them down, what a lot of work. Servos are really much nicer, and a
>Scott Edwards serial servo controller(or three) would make interfacing easy.

Try using a PIC with PWM module(s).  You can use a PLD or demux to drive
all the servos off one device.  This is how I do it in my generic robotic
controller.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

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