Sim module (sim900, sim800L) power supply problem

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hi all!
i have problem feeding arduino , sim module, i've tried 2 modules:
 

both need 5v , 1a. proyect i'm using old pc power supply able generate output 5v/18a, , i've connected sim module , arduino. in program i'm sending next commands sim module:

at+cpin = xxxx (return ok)
at+cgatt=0 (return ok)
at+cgatt=1 (module power off)

first thank there not enough current, there 18a.

can me? want power proyect battery , not able feed form power supply :(



Arduino Forum > Products > Arduino GSM Shield (Moderator: fabioc84) > Sim module (sim900, sim800L) power supply problem


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