Hello ,
I bought a new sim900a module , I tried to test it by insert a sim and tray to make a call to it , but it seems that the module didn't recognize the sim or it didn't established a connection to the network , the module is powered by 5v/gnd of Arduino uno board , Any help please ?
SIM900A cannot be powered from an Arduino board. You have to use a separate 5V, 2A adapter to power up the module. And don't forget to short the ground of the Arduino with that of the adapter.
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Thank you for your reply but 2 LEDs of sim900a is blinking , is it not enough ?
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can you send AT commands to the modem using the serial monitor?
if so try the following
AT+CGMI returns the manufacturer's name
AT+CGMM returns the MODEM model number
AT+CGMR returns details of the software and model revision level
AT+CGSN returns the MODEM's serial number
and to check the SIM
AT+CIMI returns IMSI of the SIM card
AT+CCID returns the SIM ID number
AT+CNUM returns your telephone number
e.g.
AT
OK
AT+CGMI
SIMCOM_Ltd
OK
AT+CIMI
+CME ERROR: SIM not inserted
you can see I don't have a SIM inserted
Sim900A module has two LEDs. One is Power LED and another is the Network LED. The Power LED is always on when it is powered up. The Network LED will blink after every 3 seconds when the module is registered to the network. If the network led is continuously blinking, it means it is not registered to a network. You can't use it in this condition. When there is not enough current, you'll notice continuous blinking of the network led.
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