ambient light sensitive LED, using the same LED for sensing as making light
(pretty nifty trick, makes me wonder my more electronics
don't do it. No need for blinding indicators in a dark room)
I've recently bought an arduino and have been playing around with it. I'm definitely a novice when it comes to electronics but I would love to know how that works.
Do you have writeups online for any of these projects?
The key points are remembering that there is capacitance on the pins of the microcontroller, and that while forcing an electron across from P to N emits a photon, absorbing a photon lets an electron back from N to P if it wants to go.
Comments
ambient light sensitive LED, using the same LED for sensing as making light (pretty nifty trick, makes me wonder my more electronics don't do it. No need for blinding indicators in a dark room)
I've recently bought an arduino and have been playing around with it. I'm definitely a novice when it comes to electronics but I would love to know how that works.
Do you have writeups online for any of these projects?
I think I wrote this: http://www.arduino.cc/playground/Learning/LEDSensor
The key points are remembering that there is capacitance on the pins of the microcontroller, and that while forcing an electron across from P to N emits a photon, absorbing a photon lets an electron back from N to P if it wants to go.