Elenco LIGHT User Manual
Page 32
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Project 32
Automatic Light
Project 33
Color Oscillator
Build the circuit as shown, and
place one of the LED
attachments (tower, egg, or fiber
optic tree) over the LED on the
Color Organ (U22). Turn on the
switch (S1) and watch. The color
organ light will change colors on
its own.
Build the circuit and turn on the slide switch (S1). Set the lever on the
adjustable resistor (RV) so the white LED (D6) just turns off. Slowly
cover the phototransistor (Q4) and the white LED brightens. Adjust the
light to the phototransistor to turn the white LED on or off.
This is an automatic street lamp that you can turn on at a certain
darkness and turn off by a certain brightness. This type of circuit is
installed on many outside lights and forces them to turn off and save
electricity. They also come on when needed for safety.
You can replace the white LED with the color LED (D8) or the red LED
(D1), but you may need to readjust the sensitivity using the lever on RV.
This circuit is an oscillator;
it uses the color organ to
control itself.
LED
Attachments