powering arduino and hbridge

i building robot engineering class, , having power supply issues. how can wire arduino , hbridge run on run on 2 individual power supplies, have them work together.

i running sg90 servo, ultrasonic sensor, 3 sharp ir sensors, 2 collision sensors, tamiya gear box, , 8 way line sensor array.

my plan use 6aa batteries run hbridge, , 9v run arduino. think fried board trying wire first time.

any or advice appreciated

get wall wart, saves lots of money buying batteries (and helps save planet in process). small 9v batteries terribly wasteful , inefficient (if because lose half power in regulator, brings down 5v!)

but if insist on batteries: connect grounds. should it.

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