Hi, i just bought a two Uno shields and two GSM shields. No i have follow problems: SIM900 modul and component U1: LM317 getting very hot. I can upload codes to Uno and code running but GSM_GPRSLibrary_AT examble says in serial monitor -> GSM Shield testing. DB:NO RESP DB:NO RESP DB:NO RESP ERR…

Uno and GSM shield SIM900

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