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Author Topic: H Bridge Chip Suggestions  (Read 1035 times)
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I've been working on a robot project, and I'd like to build a custom PCB which combines a avr microcontroller, power supply, h-bridge and sensor circuits. My attempt is partially to learn about making my own PCB, but also I'd like to make a nice clean robot without a bunch of wires hanging off it.

So far nothing has been too overwhelming, but I came across quite a few h-bridge chips in my research and I wondered if there was some guidance from the group on some of the options.

My needs are pretty basic. Two 0.15 amp 3v motors, I'd like to operate fwd/reverse with PWM speed control.

A few chips I've looked at:

L293D
754410
L298
LMD18200

Does anybody have experience with these chips and how did it work for you?

I have a couple of 298s in my stock, but I don't have fast recovery diodes. But, overall it seems a bit overkill for my needs.

If you need further details just let me know.

Many thanks,
Mike
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I was just reading the L293D datasheet for someone else, looks like it'd do the trick for those motors.
Built in diodes too.
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Be aware that these types of chips may have a voltage drop across them that might be significant in the 3v range. 4.5v might be needed to get full performance from the 3v motors.
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Be aware that these types of chips may have a voltage drop across them that might be significant in the 3v range. 4.5v might be needed to get full performance from the 3v motors.

I was planning on a 9V power supply (AA batteries) for the entire board, so I'm thinking I should be ok?
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I'm wondering, did I get the hook ups on the 293D correct (see circuit attachment)?

Do they make a dual inverter? Or do I need to use a hex, and waste the empty pins?


* Screen shot 2011-02-25 at 9.46.44 PM.png (21.98 KB, 485x609 - viewed 14 times.)

* Screen shot 2011-02-25 at 10.52.55 PM.png (40.7 KB, 996x667 - viewed 10 times.)
« Last Edit: February 25, 2011, 11:53:55 pm by dezguy » Logged

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Sure, you can get a dual inverter - its called 2 transistors smiley

But if you're not doing much else, why not just use 2 more pins?


* simple_inverter.jpg (27.81 KB, 960x720 - viewed 16 times.)
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Yeah that looks much simpler. smiley

Do you mean, use two pins on the mu?
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Yes, 6 pins total from the arduino. 1A ,2A, 1-2Enable, 3A, 4A, 3-4Enable.

Transistor and 2 resistors about as simple as it gets for an inverter. I used that to invert a TTL level serial stream so the 328 UART would read it correctly.

You could try this sn74lvc2gu04 from TI if you don't mind surface mount
http://focus.ti.com/lit/ds/symlink/sn74lvc2gu04.pdf
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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