I have both Jetson AGX Xavier and Nano.
I want to use a button as GPIO input to identify a signal to gracefully shutdown the devices. The problem is that I don’t know what voltage level can I safelly input to them.
I also have a GPIO output signal configured to control a reset pin of another dev board. In AGX Xavier the output pin is 40pin Expansion Header pin#22 (gpio417 in sysfs) and in Nano is 40pin J41 Header #31 (gpio200 in sysfs).
In Xavier, I have J514 header configured in GPIO 3.3V (1-2 connected as described in “Nvidia Jetson AGX Xavier Developer Kit Carrier Board Specification”) but when I measure the output high voltage it shows me 1.5V.
In Nano, the same. I read in the forum that all GPIO’s are 3.3V level (About GPIO voltage). But when I measure the output high voltage it shows me 1.8V.
I would like to know if I can safelly input 3.3V on both modules (I would use 40pin Expansion Header pin#15 in Xavier and 40pin J41 Header pin#33 in Nano) even with output showing me lower voltage ?