GPRS & Arduino UNO Connection issues

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1

I am working on trying to send an SMS using the GPRS Shield and Arduino UNO board. I have been following the wiki page for the GPRS Shield, and on the webpage under section 7.1.1 is where I encounter my error. (garden.seeedstudio.com/index.php … PRS_Shield)

I have my GPRS attached to my UNO, and when I try and upload my sketch (using Arduino sketch tool), I recieve the following error(s):
avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

However, when I try to upload the sketch without the GPRS Shield attached, the upload works, but I don’t get a response from my Serial Terminal.

Any help would be appreciated, thank you.

2

Remove GPRS module during firmware upload. They are sharing the same UART.

3

You need another arduino to monitor the UART communication output… no other way around.

4

Thank you, but I am confused. The instructions acknowledge the issue you brought up, but seem to lead me to believe that there was a work around, and not 2 arduino boards.

So is this what I need to do:

  1. Upload the sketch to the board
  2. Attach GPRS Shield
  3. Reset the Arduino Uno board
  4. Type AT in the serial command

This should work?

5

Okay, so when I posted, I didn’t have a SIM card in place due to misreading the wiki. Regardless, I have a SIM card in place, but still no dice. The status light on the GPRS Shield is now RED, what does this mean?