FNTPuck
Well-Known Member
- Local time
- 7:18 AM
- Joined
- Jul 2, 2018
- Messages
- 855
Yea, I use lab grade 10k ATH thermistors that have a very fast response time which is important when you want to run at a dynamic 1* above dew point. For 24/7 use that means the cold plate is usually around 18*c but I can get it down to 3-4* under load if I want. I used to run a chiller in line with it and it had no problem holding 0c with the peltier plate at only ~40% duty cycle, so I know it was capable of well under 0c but controller wouldn't allow it.Yeah, a remote hard reboot on a server is definitely great tool in some cases where the server won't respond otherwise, and the function needs to be restored ASAP. I used to do a lot of remote control-systems support for plant equipment. Sometimes, the plant couldn't wait for me to drive an hour or two to them to get something up again before things got dicey or expensive. I usually could guide a human to force the reboot, but automating it where it makes sense and is safe to do is the ticket.
I did control systems - PLCs/DCS/HMI/SCADA/DAQ engineering work before my body broke down a few years ago. LOL, probably from being on call all the damn time! The meds I have to take now and the pain I have cause some frustration with doing technical work that used to be easy for me. But I can still code anything I really need, and the support libraries for arduino and pi are ubiquitous and decent. The possibilities are endless indeed.
Your peltier cooler sounds cool. (but clearly you don't want to let it get too cool, lol. liquid water is no bueno there.) Replacing your controller with an arduino and your own code will be great. BTW, I've used 10K NTC thermistors for easy temp measurements on arduino. I built a crock pot controller for making yogurt and sous vide cooking. And also to pasteurize eggs without cooking them to make safe to eat cookie dough and cake batter for my kids, LOL.
I've worked with thermocouple inputs a lot industrially, but for my CHT, I'm going to try a MAX 6675 module from eBay. Interface is SPI, so I'll need a micro. Total cost of the CHT monitor will be around $10. Maybe a little more depending on how I display it.
I haven't done much raspi or arduino work since my son graduated HS. I used to mentor his robotics team. So, I'm a little rusty, but it'll come back as I need it.
So in my infirm and uncertain retirement situation, I hope to have some fun and share some ideas. I'm not very sharp anymore, but I ain't dead yet either.
These are the thermistors I use vs the big cheap slow ones which made it difficult to hold a set temp (it would ramp up and down constantly). They are glass bead and epoxy sealed with a sub1s thermal response time. Most cheap thermistors like for the adafruit and RPI are up to 10 seconds to fully adjust to temp changes. Its rated to 270c which is over 500*f so would be great for a CHT probe.