Thanks Lenny, yea I think that my low temperature idea was bad from the get go. I was programming the Teensy in between these episodes, so it just coincided with the box being out in the cold. The problem is some code I changed/added. I'm going to dig into it later today to figure out what was bad. If I revert back to v3.1.5 and power cycle the box, it's working fine. Thanks for the response!

Just to try and document my nonsense in case anyone else goes down this road, it looks like some code I changed corrupted something with timers/sensors. Since the sensors remained powered even through Teensy programming, the error continues until the offending code is removed and the power is completely removed from the board.

Probably not surprising, but I'm beginning to think I have messed something up. Even though I reset a bunch of times last night, I tried getting everything reset and things seem fine at the moment. Hope I can pin point what I may have done to cause the problems.

So it seems I may have misdiagnosed the problem. After some searching it appears that lastwatchdogRefresh is getting corrupted somehow. But it works for a period of time maybe? I see it at '300' when it goes through the main loop the first time and the next time it comes around, it is at a value around 5000 that seems to increment each time the program resets. It increments by two each time the program resets. But it does not increment at all since it is much higher than the millis() function would report in order for the difference to be >500 as shown at the end of the main loop.

Well I proved myself wrong. After working on a few things, it started happening again. Still trying to get more data.

Sorry for not responding to this sooner. Nick, I ended up taking Lenny up on the offer of getting these items from them.

I had mine made from jlcpcb, but that’s just because I have used them before and had some other boards to order at the same time. I’d be fine if you just made a donation to the group here and I can send along a board and some components. I will try to work on getting it out this week and a list of what components I will be able to include. There were some where it was easier to buy a lot of 🙂 If you send me a private message with your email I can get in touch to get your address.

Hey Dale, sorry for the delay. I’ve been in the middle of a move. I haven’t quite finished the build, but with all the components in stock it shouldn’t take nearly a day to do. Easily done in half a day i think. I still have boards available with some components and a little tubing. Let me know what you’re looking for and I can try to help in any way I can.