Automatic colour change
Open door number 23 and remove the
very special LED in a clear housing. It
actually contains three LED crystals in the
colours red, green and blue (RGB) as well
as a controller that switches the individual
colours and fades them into each other. If
you look into the RGB LED from the front
when it is switched off, you can see the
individual parts.
Like a normal LED, the RGB LED also needs
a resistor in series. The piezo speaker is also
connected for this test. You’ll hear strange
sounds when the colours switch. Sometimes
the controller creates a kind of flashing
light. Then all you’ll hear is a click. In other
phases, the fade is gradually made from one
colour to another. In fact, the controller
23
Do not look directly into the LED from a
short distance when switched on! The blue
light is particularly harmful to your eyes.
Attention!
then switches each of the LEDs on and off in
very rapid succession, changing the ratio of
switch-on lengths. In this way a changeable
tone is created.
