Mod edit (@harrisonhjones): Solution:
1. Use the search feature. If you can’t find anything make your search more generic.
2. Try to match the IO voltage between two devices you want communicate.
After some effort, I finally have an Arduino Pro Mini (3.3V) that monitors the temp of my outside grill, the ambient temperatures outside and inside, and detects if my deck door is open/closed. I output this to a small OLED that will be mounted in my kitchen to basically keep an eye on the grill and, separately, to tell us if we can leave the deck door open to allow for fresh air without cooling the house. I’d like to push the four outputs (grill temp, outside temp, inside temp, and door status) to a Photon so I can use that data in other applications.
I’ve read where folks have successfully pushed data from a Redboard to a Photon but I can’t get it to work on my Pro Mini. I’m either not following along properly (not surprising since I’m still new to this stuff) or maybe it won’t work without a lot of magic. At a minimum I’d like to get the outside/inside temps to a Photon. I can easily & cheaply do that by just running separate TMPs with my Photon and not worry about the two devices communicating with one another.
So my question: Is it possible without a lot of magic/$ to send data from my Arduino Pro Mini (3.3V) to my Photon?