upgrading my boe-bot from servos to gearheads
All-
I'm looking to improve robot performance by upgrading my boe-bot from servos to gearheads--using the SN754410 to drive them. I notice that interface requires 6 pins (for 2 motors) and I am a bit short. Since direction control requires INA and INB be opposite (High/Low or Low/High) and gearheads shouldn't require break or coast, I'm thinking a chip that ouputs opposite states (low on pin A outputs Low/High on pins B and C, High on pin A outputs High/Low on pind B and C) would save 2 pins. Can someone name (or point to a thread naming) this chip?
Thanks
Post Edited By Moderator (Chris Savage (Parallax)) : 3/20/2006 3:22:59 PM GMT
I'm looking to improve robot performance by upgrading my boe-bot from servos to gearheads--using the SN754410 to drive them. I notice that interface requires 6 pins (for 2 motors) and I am a bit short. Since direction control requires INA and INB be opposite (High/Low or Low/High) and gearheads shouldn't require break or coast, I'm thinking a chip that ouputs opposite states (low on pin A outputs Low/High on pins B and C, High on pin A outputs High/Low on pind B and C) would save 2 pins. Can someone name (or point to a thread naming) this chip?
Thanks
Post Edited By Moderator (Chris Savage (Parallax)) : 3/20/2006 3:22:59 PM GMT
Comments
·· It sounds like you just need a standard Motor Controller.· A few different controllers can be found at the following link.· As a side-note you should use a descriptive subject line for your posts.· I fixed this one for you.
http://www.parallax.com/html_pages/products/motorcontrol/motor_control.asp
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Chris Savage
Parallax Tech Support
csavage@parallax.com
May we presume that by "gearheads" you're speaking of stepper motors with gear reduction? There are many different kinds of motors with gearheads on them, that's why I ask.
A simple inverter (74xx04) will change a HIGH to a LOW or a LOW to a HIGH:
/code
I· 1--*
1·\
N 2 --|
*
0·· \· INA
A 3---|
|
*
0· ·/ connection
·· 4---|
|
|
*
1 /
········ |········ |······· |·······|
······· --······· --·······--······--
······· V········ V·······V·······V··· <== 4 x 7404 inverters
······· |········· |········|······· |
········
|
|
|
0 \··· former
···················
|
|
1· \· INB
······························
|
1··/· connection
·······································
0·/
code/
Apologies for the ASCII sketch.
Regards,
Bruce Bates
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
<!--StartFragment -->
Oh, I'm sorry about not using a subject-- I was so careful to proof everthing before I posted, but completely missed the subject field.
sorry it's a little off topic.
Parallax used to sell the EZ Roller kit, but I don't see it on the site anymore:
http://www.solutions-cubed.com/solutions cubed/EZR2003.htm
Note, that is one link, but they have a space between solutions and cubed so the Forum software stops making a link out of it at the space. Just copy and paste the entire line in your Browser's location box.
The GHM-04 is good because you can attach an encoder to it and it runs off of 7.2Volts
http://www.lynxmotion.com/Product.aspx?productID=96&CategoryID=11
Kenny