Geeetech

I have one case: Catduino and GPRS Shield applied to computer by USB then GPRS Shield switches off when it send SMS. And other case, when Catduino and GPRS Shield applied to 12V/1A AC/DC adapter and work properly. May be it is not enought current in first case?

I bought AC to DC adapter 12V/1A and with that equipment Arduino GPRS Shield and Catduino works properly.

Hi! I have Arduino UNO R3, Catalex Catduino (arduino compatible board http://item.taobao.com/item.htm?spm=a1z10.1.w4004-3029767250.6.yewtB1&id=20548359578) Also I have Arduino GPRS Shield. With Arduino Uno R3 that GPRS Shield works properly. But when I use Catduino, GPRS Shield turn-off. For example...