Cytron Technical Forum

Hi all,

Can RFBee shield works together with SIM900 GSM Shield in one time?
I've tried to shield both together. But the GSM cannot register to the network.
Hope someone can help me.

Thank you

How do you combine both the shield? mind showing us the hardware? A few clear photos will help a lot.

Try to make those shields work alone first. The GSM does not need the RFBee to detect the GSM network, so it should work without the RFBee.

I dont know how to upload the picture. But i just shield all them together. Starting with arduino, then GSM shield,lastly RFBee shield at the top. My project is to send an SMS after analyzing the data received at RFBee (master).

I've tried those shield work alone and it works. But, when i tried to combine them, the GSM shield cannot register to its network even i have power it on.

The serial monitor will show this:

GSM Shield testing.
DB:NO RESP
DB:NO RESP
DB:NO RESP
Trying to force the baud-rate to 9600

1200
2400
4800
9600
19200
38400
57600
115200
ERROR: SIM900 doesn't answer. Check power and serial pins in GSM.cpp

If the XBee shield and GSM shield is using the same UART pin, there will be interference. That is the reason you need to show the actual hardware photo, each shield, clearly.