Hi Guys, Im working in a GSM / MP3 System. My arduino will call a number and when a person answer the call, a mp3 song message will play. Im using 2 shields, a GSM Shield Sim900 and a MP3 Shield from Sparkfun. The 2 Shields separately works normaly, the Gsm make a call and the other play a song. w…

Gsm + Mp3

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