Building a Mini Dual H-Bridge

Claiudiu

Hey, i want to make this project: http://www.instructables.com/id/Hexagon-Acrylic-Robot/?ALLSTEPS and i really need to know how can i build the Mini Dual H-Bridge.
Can anybody help me with a schematic? Or maybe there`s an IC which contains all the transistors so it will costs me less space ??
Thanx

RobotWorkshop

It looks like you could use one of these H-Bridge modules for building a robot like that:

www.ebay.com/itm/370820305644

W9GFO

This is a really small 2 motor driver, it's only $6;

http://www.pololu.com/catalog/product/2135

This one may be more appropriate for use with a Basic Stamp since it can run the motors while the Stamp is doing other things.

http://www.pololu.com/catalog/product/1110

cavelamb

Claiudiu wrote: »

Hey, i want to make this project: http://www.instructables.com/id/Hexagon-Acrylic-Robot/?ALLSTEPS and i really need to know how can i build the Mini Dual H-Bridge.
Can anybody help me with a schematic? Or maybe there`s an IC which contains all the transistors so it will costs me less space ??
Thanx

http://www.instructables.com/id/QuickStart-bi-directional-motor-control/
That's an all transistor bridge using 2N3904-2N3906 transistors on a Propeller Quickstart.
It works, but it's way large.

I'm using a TB6612FNG breakout board for a much smaller package.
From Sparkfun - https://www.sparkfun.com/products/9457

And just starting on the software... dual motor PWM driver.
But that's Propeller stuff...

Duane Degn

I use boards like RobotWorkshop linked to in several of my robots (I think there are even cheaper boards than that one on ebay).

Another easy solution if your motors aren't going to draw too much current are SN754410 chips.

I think it will be difficult to send a PWM signal to the two motors from a Basic Stamp. From my reading of the Basic Stamp manual, it looks like the PWM command blocks the flow of a program. I also think the Basic Stamp's PWM frequency my be too fast for some H-bridges. I believe these problems are one of the reasons the BOE-Bot uses CR servos for its motors.