@ektor5 this is probably for you... I love the picture inside the box of the NEO (soooo useful) but there are a few pin allocations that I'm not clear on: AREF (31) and IOREF (46) and 47 in particular. Ref = reference voltage? I don't want to go poking around and destroy something!
Hi there, The different color was meant to separate the two row labels (see the legend). So for example, AREF and 31 have two separate holes. The Pins you named (AREF, IOREF) are from the inner row (Arduino) and have the same functionality of the Arduino UNO ones. The others (31,46,47) are the labels for the external row, set as GPIO for the application core (A9), usable in Linux. Please refer to the NEO Documentation to have further information on the use of them! BR, Ek5
Fab! Thanks for clearing that up (ARef is/was[?] a traditional usage for "analogue" reference (where there is a separate digital ground I believe).
As a curiosity here (apart from complexity) why don't we have a bank of "crowbar" zenners on the GPIO? I've used this successfully in the past - not for such a low voltage though.
@I Hate Google! If you are asking why we don't implement limitators on zenner we have to look better into it, but the cost of the implementation seems not trivial.
