Hi everyone,
I have a Levoit air purifier here. Upon plugging it in, the device needs a button press to start. I would like to modify it so it starts immediately upon plugging it in.
The device has no-contact switches - I assume they work by detecting the magnetic field of my finger via the spring. I have attached two pictures of the switch circuit.
The device behaves as follows: When I plug it in while my finger hovers over the spring, nothing happens. When I lift my finger, the device turns on. So the device reacts to the moment when I lift my finger.
How can I modify this so that it turns on automatically? The act of lifting my finger must induce some kind of signal, and I'd need to build something to induce that signal. However, I don't know how these contactless switches work.
I have two specific question:
1. What kind of signal do these contactless switches produce, or how can I find out? (I have a multimeter at hand)
2. How can I replicate that signal so the device turns on automatically?
Thanks!