I am curious if anyone has any idea on how to make a IR sensor or break beam sensor that when blocked, dims on an LED (and keeps it illuminated while blocked) and then dims off when not blocked. Or any other advice to achieve such a goal?
basically when blocks this "beam", the light would slowly fade on (kinda like a short fade-on delay) then when out of the "beam", it fades off.
What do you mean 'dim on' and 'dim off'? I'll assume for ease that you mean 'turn on' and 'turn off', in which case a commercial light beam unit from Radio Shack or anywhere similar will do the trick. They generally have relay contacts available for switching a load.
Ken
Well, get one of those commercial units and feed the voltage into a Resistor-Capacitor part. Then plug the light between the capacitor and the ground, and voila, you've got your dimming. Something like that:
Vcc | .--------. | | | | | |---' | Unit | | | | |---. '--------' | .-. | | | | '-' | o-------. | | --- .-. --- ( X ) | '-' GND | GND
(created by AACircuit v1.28.5 beta 02/06/05
What he mean...effectively light dimmer. Using IR beam to fade in and fade out the light.
An ORP12, a few resistors, a big capacitor and a ZTX601.
-- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk
Philips make both the light beam units and the fade control units, so probably the easiest thing to do is see your local industrial lighting people and see what they have.
Cheers.
Ken
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