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9v battery + arduino mini pro help? Answered

can anyone tell me what resistor to use with an arduino mini pro and a nine volt battery, i would work it out but my multimeter is broken and i cant find out the amps of the battery, i tried just connecting it to the raw pin and running a sketch but he chip gets hot very quickly. could i have permanently damaged my arduino? i am quite new to electronics and am using a tilt switch to open a parachute on a water rocket.
thanks very much :)

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