rockwallaby:
What sort of screen would you be thinking of ?
Any sort of small lcd would be fine. when you mentioned a 20x4 display it gave me an ideal of something similar I had used in the past, I remember using a cheapy Kinco HMI MD224L for a assembly line project I did a while ago, unfortunately I don't have one to tinker with in the shop. With that said, my history of programming is a bit spotty with the majority of my working history dealing with mechanical design instead of programming, I was able to easily learn ladder logic, and just now learning arduino and more advanced stuff. One of my good friends knows Python well so ill bounce the ideal off of him to see what he thinks.
I got a few of the colour lcd touch panels, and a lcd character panel in my arduino goodie box, and I have a couple DUE's in the mail on their way for a WS2812b led project I am planning. I could experiment with a whole bunch of different combos with the leftovers.
Just to note, I would consider myself a beginner when it comes to the hard coding for stuff like this, and I understand that this could be a pretty intense project just to get basic temperature readings, power readings, and a on/off command to show up on a screen.
With that said, if it all works, it would be pretty cool to be able to easily semi-automate liquid nitrogen or liquid oxygen production at home. The unit works as it is, I just want it to be user friendly for myself in a nice bench top enclosure. There's a 2nd stage to this project that is not directly related to this HMI screen, but in case anyone is interested; to feed the unit with 99.9% pure N2 or O2, im designing a compact pressure swing absorber to purify N2 or O2 for use. Very similar to the large scale systems used to purify air and generate nitrogen for tire inflation systems.