Protecting My Circuit From Burn Out

[bitMario]

I have a arduino mega 2560 , 3 h-bridges( 3-36vols 30A max) and 3 wind shield motors 12v 15A.
How i can protect my arduino, the mosfet bridges and the motors from burn out? I know that my hardware is cheap and the bridges also. Can you give me some advices and maybe some kind of circuit? Thank you very much!

[RacingMat]

Hi bitMario!

You can start by using slow 12A fuses between your Hbridge and your motor (1 fuse on 1 of the 2 wires per motors): if one motor got stalked for example, its fuses will blow and protect your Hbridge to burn.

You can use a fuse also on your power supply:
if the overall current consumption is too high, it will stop all the system.

And you can use an opto-isolator on the wires between your Arduino and your H-bridges in order to prevent pollution from high power circuit (to motors) to logic circuit (to Arduino). Opto-isolator have specifications: some can deal with high frequencies, others not...

yours
Mat