Hello,
I have installed a led ribbon to light up my kitchen worktop, together with a voltage converter (12v).
I now would like the led to light up (or switch off) automatically when I place my hand next to the converter.
Which sensor should I choose ?
I have thought about a PIR. Maybe be someone has a better idea...
Thanks a lot for your help
Dom
PIR has no range limit, you would probably need to shade it not to be confused by people moving about the
kitchen, and the worktop may prove to be reflective to far IR, so some experimentation. Ultrasound
would work too I think (beware the minimum distance limit for such sensors). Doppler radar sensors
would probably respond to everything in the room and be annoying.
If you use a PIR sensor, then you might not need an Arduino.
Common PIR modules can work on 12volt (buildin 3.3volt regulator), and have a time delay pot (~0-7 minutes).
All you need is a mosfet to switch the LED strip with the 3.3volt logic signal of the PIR.
The hard part could be mounting the PIR so that it's only triggered when you want it.
Leo..
A laser or ir beam break would do this, or what about a capacitive sensor?
Or even an rfid tag on your wrist with the receiver on the converter?
Just thinking of alternates! 