Hi,
I recently bought an Arduino GSM Shield 2 (1) and an Arduino Zero Pro (2).
And yes, I know … they work on different voltages (Shield operates on 5V while the Zero works with 3.3V).
My question is as follows:
If I place my own proto shield (3) in between the controller and the shield which takes care of the 5V/1A power supply as well as the necessary I/O level shifters (4) for pin 2,3 and 7 (5) … I believe I should be set if I didn’t miss anything from the schematic(6).
I don’t believe there should be other reasons why these two are incompatible since pin 7 is only a status pin and pin2,3 are used by the SoftwareSerial library.
Your thoughts before I try this and fry one ... or both 
Kind regards,
Wim.
(1) Arduino - Home
(2) Arduino - Home
(3) Proto Shield Rev3 (Uno Size) — Arduino Official Store
(4) http://www.ti.com/product/lsf0204 (but one example)
(5) Arduino - Home
(note: picture above taken from page Arduino - Home )
(6) File Not Found
