Problem Dumillanuove + Libellium GPRS Shield

Forum 2005-2010 (read only) Hardware Interfacing
1

Hey There,

I've been spending in vain my last days to get the Libellium GPRS Shield (bought mid of March) with my Arduino boards running. I followed and tested all instructions on http://www.libelium.com/squidbee/index.php?title=New_GPRS_module_for_Arduino_(Hilo_-_Sagem) [soldered a 220uF capacitor, have been able to make use of a second arduino to eavesdrop the serial communication, trying the stand alone and usb variant] and couldn't get a response from the shield.

While I can measure that the shield is powered (4.99V on the voltage reg) it seems that it can't be switched on - neither with the button nor programatically (i didn't forget to change the jumper). I haven't been able to get any serial response from the shield.

I've got two GPRS shields and don't believe that both are broken. Making me believe that I might do something wrong. Has anyone experienced the same or some tipss?

Thanks in advance!

2

Hi novazembla!
Have you succeeded to resolve this problem?

I am using a duemilanove board with the HiLo GPRS module from Libelium as well. And here's my situation:

Here's my situation

  • Duemilanove, Atmega removed
  • Capacitor 220uF/24V soldered
  • Power supply 12V/3A (also tested with 9V/3.5A)
  • Using Putty 115200-8-N-1 and serial on cygwin
  • Successfully upgraded firmware (ati3 returns SAGEM HiC,A.007.00)

Case 1: USB Powered

  • Arduino feeds power to the shield
  • Jumpers set to USB gateway so I can talk to it
  • Jumper set to Arduino 5V
    Result
    o Pressing on for 2s does not result in any PSSK greeting message
    o I can issue at which returns OK
    o I cannot pass AT+CPIN=”****” – it usually dies after max an additional AT

Case 2: External Powered

  • Power supply feeds shield (via Arduino board)
  • Measured 5V at the base of capacitor
  • Jumpers still set to USB gateway (so I can talk to it)
  • Jumper set to V Ext.
    Result
    o Pressing on for 2s does nothing at all (no greeting)
    o Cannot talk to the shield using Putty/serial at all - zip - nada - nothing

The switch on the GPRS is a tiny push-down button. I have no reason to assume it's defect. Is that switch defect?