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Topic: sn754410 h-bridge with dc motor won't run (Read 772 times) previous topic - next topic

humjaba

Hello,

As the title says, I'm using an SN754410 IC to power a standard DC motor. I've been following these directions: http://web.ics.purdue.edu/~fwinkler/616/sn754410_Arduino.pdf . By changing the PWM value, I can get voltage across the two outputs to be between 0 and 12V (as measured by a multimeter), but when hooked to the motor it does nothing... The motor will spin when hooked directly to 12V, and I was able to control it via PWM with a TIP31B transistor as well. However, I would like the ability to reverse the direction (thus the SN754410).

I'm at a loss on this one. Any ideas?

MarkT

There is no such thing as a standard DC motor - they come in all sizes from microscopic to hundreds of tonnes...

We need the specifics of the power supply and motor and how you have wired everything up.  You may have omitted something trivial that'll be obvious on inspection (missing ground connection for instance).
[ I won't respond to messages, use the forum please ]

humjaba

We are using this motor: http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_161382_-1
The power supply is a rewired XBOX 360 PSU (12V, 16.5A).
I have followed the wiring diagram on page 2 of this document. As I said, according to the multimeter, I'm getting the correct voltage. However, when I connect the motor, nothing happens =( I will probably rewire the circuit tomorrow and tidy it up a bit, and take a pic to post on here.

MarkT

Well that seems plausible - but you say the output voltages are right without the motor connected - have you measured them with the motor connected?
[ I won't respond to messages, use the forum please ]

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