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I need to upgrade my robot from servos to DC motors, so I need a motor controller module. Since we are talking about these I2C modules why not try to build one that could be compatible with the standard. Take a look and let me know if you find issues with the design. It is suposed to be half standard size. An I have to say I hate the I2C connectors on both sides!
SN754410 is rated 1A per motor. I have used this H-bridge in robots before and had no problems. Also I have stacked 2 of them one over the other with a heat sink between them and above the second one to double the amps and it works fine. As usual, people tend to use the parts they have some experience with. I know there are other chips out there but I don't have any experience with them. So far I have built small robots and didn't need more amps, but there will be the time to get there. Probably L298N would be ok as a medium sized driver, perhaps use one chip per motor to double the amps.
so ro-bot-x, are you making a smaller current dc motor driver?
im doing the one with the l298 but im not sure about more amperage...
My professor for my robotics work told me that when a motor switches directions there are spikes in current. I don't know exactly why but this can easily kill any h-bridge that does not have a high enough current rating.