DarthMessiah15 0 Posted August 9, 2011 Share Posted August 9, 2011 Hey guys, i'm using a 754410 hbridge as a motor driver for a little 3.3 volt radioshack motor. Having a wierd problem though. Whenever I start running my code, nothing happens, but then if I pull out my MM and start checking pins to make sure everything is where it's supposed to be, well, then it starts working. I thought it might be a loose connection but have eliminated that from possibility. any ideas what this could possibly be? Quote Link to post Share on other sites
bluehash 1,581 Posted August 9, 2011 Share Posted August 9, 2011 Could you roughly draw your schematic. Also is 3.3V enough for switching. Is it a 5V ttl chip? Quote Link to post Share on other sites
DarthMessiah15 0 Posted August 9, 2011 Author Share Posted August 9, 2011 It is a 5 volt chip, I have the 5volts coming from T0 on the launchpad. then it's basically p1.0 and 1.1 are the select bits, and 1.2 is the enable bit. it works fine.. after i poke at it with my MM. but not before. can't figure it out for the life of me. i'll try to draw up a schematic and take a pic when I get home. Quote Link to post Share on other sites
bluehash 1,581 Posted August 9, 2011 Share Posted August 9, 2011 Try to do this. Remove 1.0 and 1.1 b/w LP and driver...and manually connect 5 V to one of the the driver chip control lines. The other one to gnd. If it works, it's a voltage level problem. Schematic will be good. Quote Link to post Share on other sites
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