Laser safety system: Arduino Nano + 3 DS18B20 + flow sensor (has not arrived yet) + relay board + RGB LED. 3D printed LCD case and electronics support plate.
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Have you thought about adding door interlock switches to the system to disable laser if door is open?
Nice clean wiring
The door switch is wired directly, for me that is the most critical safety feature. The Laser Enable switch is in series with door interlock and relay driven by Arduino.
OK, got ya.
Great! I’m waiting the tutorial 
@Sonex128 thoughts?
That’s cool. Would be handy to be able to see those values.
The original LaserSafety is on github. He uses some analog temp sensors and I chose ds18b20 the steel waterproof model as I have plenty of them. The plastic parts I drew up in a hurry in SketchUp and 3d printed. You can find similar on Thingiverse but I was too lazy to search and measure
Mircea, Did you modify code at all??
No, I’m running the code on github.