envoie sms module sim808

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il faut peut être lire toutes les lignes de l'exemple

//#define PIN_TX    10
//#define PIN_RX    11
//SoftwareSerial mySerial(PIN_TX,PIN_RX);
//DFRobot_SIM808 sim808(&mySerial);//Connect RX,TX,PWR,

et le wiki

Steps:

Insert a SIM card in to the SIM slot on the SIM808 expansion shield
Stack the expansion shield on to an Arduino UNO
Connect an external power source to the Arduino
Set the function switch to None
Upload the sample code
Set the function switch to Arduino and make sure SIM808 could communicate with Arduino board
Press the Boot power button
Wait for the SIM card to register the network, the Net indicator LED will slowly flash every 3 seconds