Digital pin interfaced with analog pin

Hardware
1

Hi everyone. I’ve a question about interfacing two boards- one a photon, the other an arduino.
Firstly, I think it should be possible, but just to check:
Is there any reason the analog pins on an arduino couldn’t measure a voltage on the photon’s breadboard, as long as they share a ground?

Secondly, since I believe that to be possible, I’ve been trying to implement it by having the arduino analog pins read the voltage from a photon digital pin. however, when I do this, the analog pin reads ~2.5V all the time, regardless of whether the photon’s pin is set to HIGH or LOW.

Any insight on this would be appreciated; it seems to me that the digital pin isn’t actually writing. Sorry if there’s documentation I’ve overlooked, but I’ve been searching without any luck.
Thanks!

2

You may want to show the code of both sides?

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3

Haha, thank you! Simple things. In the process of copying the code for you, I discovered I forgot to declare the pin as OUTPUT.
So, that was the issue; I suppose my lesson from this is never assume a problem is more complicated than it is.

Thanks for the help, minimal though it was!

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