SimCom SIM900



9. NetworkIndicatorLED:NetworkStatusIndicatorLED.
State SIM900function

Off SIM900isnotrunning

64msOn/800msOff SIM900doesnotfindthenetwork

64msOn/3000msOff SIM900findthenetwork

64msOn/300msOff GPRScommunication


10. ADCandPWMPins:ADCandPWMPinsofSIM900A.(Referpage9,10forADCandPWM
commands)
11. AudioInterface:AudioPins(Speakerandmicrophonepins)ofSIM900/900A.
12. SIMInterface:SIMCardholderInterface.
13. Vout:Regulated4.2Voutputvoltageforexternalapplicationcircuit.
















