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John Board
03-13-2012, 01:50 AM
Been looking at the Propeller Profesional Development Board, mainly at its motor drivers. How many motors can I hook up to it, and can I control both directions?

Here is the datasheet: http://www.parallax.com/Portals/0/Downloads/docs/prod/prop/32111-Propeller%20Professional%20Development%20Board.pdf
(http://www.parallax.com/Portals/0/Downloads/docs/prod/prop/32111-Propeller%20Professional%20Development%20Board.pdf )
(http://www.parallax.com/Portals/0/Downloads/docs/prod/prop/32111-Propeller%20Professional%20Development%20Board.pdf )Thanks, John

StefanL38
03-13-2012, 04:43 PM
Hi John,

take a look into the datasheet of the Chip itself (L293D)

http://www.google.de/search?num=100&hl=en&lr=&safe=off&as_qdr=all&q=datasheet+L293D&oq=datasheet+L293D&aq=f&aqi=&aql=&gs_sm=3&gs_upl=3540l3540l0l4133l1l1l0l0l0l0l0l0ll0l0&gs_l=serp.3...3540l3540l0l4133l1l1l0l0l0l0l0l0ll0l 0.frgbld

4 DC motors with one direction two DC-motors with two directions
one bipolar steppermotor

Buying a PPDB just bevause of the motordrivers is oversized. You can connect motordrivers like the L293D, ULN2308, L298 etc.
directly to any propeller-chip or propeller-board. These chips itself are just a few dollars.

best regards
Stefan

Duane Degn
03-13-2012, 05:18 PM
Buying a PPDB just bevause of the motordrivers is oversized. You can connect motordrivers like the L293D, ULN2308, L298 etc.
directly to any propeller-chip or propeller-board. These chips itself are just a few dollars.


I agree with Stefan.

John, have you taken a look at this project (http://forums.parallax.com/showthread.php?130797-Mecanum-Wheeled-Robot-with-Machine-Vision&p=1078203&viewfull=1#post1078203)? I'm using L298N chips. SparkFun has a good price on them. As you can see from some my latest videos, they drive the motors on my robot just fine. The also don't get hot.

Publison
03-13-2012, 05:49 PM
The L293D will drive four motors in on direction, or two motors in two directions. See data sheet:

http://www.ti.com/lit/ds/symlink/l293.pdf

(http://www.ti.com/lit/ds/symlink/l293.pdf)The 754410 is a direct replacement, and handles more current. Direct plug-in replacement.

Jim

Duane Degn
03-13-2012, 06:50 PM
The L293D will drive four motors in on direction, or two motors in two directions. See data sheet:

http://www.ti.com/lit/ds/symlink/l293.pdf

(http://www.ti.com/lit/ds/symlink/l293.pdf)The 754410 is a direct replacement, and handles more current. Direct plug-in replacement.

Jim

The L298N (http://www.sparkfun.com/products/9479)doesn't cost much more than the 754410 (http://www.sparkfun.com/products/315)and I like it a lot more. The 754410s aways seemed to get hot (even when piggy backed). I drive the L298N pretty much the same as the 754410 chips.

tonyp12
03-13-2012, 08:59 PM
What kind of Amp ratings are you looking for?

A Quickstart Prop board ($29) and my Octal (8) bi-directional motor board ($39) can do 1.5amp (2 peak) each, 11volt max.
The PCBs left China 10days ago, so I should have them any day now.