Thank you, all of you 
That came out amazing! Great work!
The only thing Iâd do is make sure your power supply is going through a gfi (ground fault interrupt, not sure if itâs called the same thing where youâre located) since itâs close to water.
@James_G I think itâs called just fi. And this is given in our case
Super table! Really cool project Severin. I can imagine you and your brother learned a lot on this project with all the different things you incorporated. Infinity mirror looks great. Thanks for sharing.
You mentioned you had problems controlling the pump with the Teensy. What sort of issues were you running into?
The copper coil in the relay leaded to high voltage peaks when turning it off. So we builded a circuit against it with a diode. After that we had the problem, and i think we still have it, that in the moment we turn off the pump it still gifes a spark inside the switch⌠so i added a coil with 10 turns on the 230 sideâŚwhich worked great but after ten tries it killed one pin on the teensy which i couldnât explain. So that was the moment when i lost the patience and removed the relais and added a 230v switch⌠Which still leads to the problem with the âdeadâ stripe or at least i guess its thatâŚ
Crazy project! Now you need to add fish! You will probably want a âvoltage snubber RC circuitâ or a diode across the relay for the motor: some good information here:
Voltage spikes when driving DC motor with N-channel MOSFET - Electrical Engineering Stack Exchange.
A large motor with momentum can really wreak havoc unless that voltage has somewhere to go.
Thats excactly what we did for the 5v side for the relay⌠I donât trust my brother to keep fish aliveâŚnot even garnelen ;).
Perhaps something like an optocoupler relay could be used to protect the micro controller.
I used exactly one like that
