Sense if my Kitchen hood is running?

[ausbremen]

I would like so set my house ventilation to maximum, when the kitchen hood ('Umluft") is turned on. I checkend, if there is a sensor for this kind of question, but i couln't find something. Has anybody an idea?

[sundberg84]

@ausbremen - well first you need some sensor to check the kitchen fan?hood. Maybe some sort of current sensor? How do you set set power to maximun, is it some sort of knob or different buttons?

Any leds you can try to read?

[sundberg84]

There is this project:

https://www.openhardware.io/view/35/Washing-machine-and-Tumbler-Alarm

which seems to read the front leds of a washing machine - maybe adaptable to your hood?

[ausbremen]

@sundberg84: Yes, there are leds for each of the 4 steps, but I´m prettey sure my wife won´t let me read the leds of the design kitchen hood (novy) ... so the sensor has to be placed inside or on the top, where it couldn´t be seen. Some kind of current sensor could do it, but I didn´t find one...

[AWI]

@ausbremen I did use a pressure sensor in the ventilation shaft. I the ventilator is on the pressure rises. But that probably would not work in your case as you will be switching the central ventilation on. Try to find the circuit diagram , in many cases you can put an optocoupler in parallel in an existing indicator light. Electric isolation and a perfect sensor in one..

[hugows]

What about a vibration sensor? At least in my kitchen, the fans do produce a slight vibration to the metal roof thing.

They pretty cheap on Ebay, I must try it myself...