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H bridge safety

I want to drive 4 seperate motors, the largest would be 7V 550 mA and about 1.2A stall. I intend using a pair of SN754410's. Power supply will be a good 7.2V. My question is, how safe is my Arduino Duemilanove board if I use the same 7.2V supply for the motors and the micro processor. Would it be a better design to have 2 seperate power supplies. I have room.

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yeah, nothing really bad will happen. I say try it, and if it doesn't work, try separate power sources. It really all depends on your motors.

edit: whoops double post. sorry

yeah, nothing really bad will happen. I say try it, and if it doesn't work, try separate power sources. It really all depends on your motors.

It's not really unsafe as such, but if your motors all suddenly stall the voltage from the supply might sag briefly, causing the Arduino to reset. You can either use 2 power supplies, or you can just install some good capacitor filters.

2 power supplies is always better.