Elenco LIGHT - Manual (Page 81)

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Project 180 Super Infrared Detector
You need an infrared remote
control for this project, such as
any TV/stereo/DVD
remote
control in your home.
Build the circuit. The red LED
(D1) will be dim. Turn on the
switch (S1). Point your remote
control toward the infrared
module (U24) and press any
button to activate the white
LED (D6). Once activated, the
white LED stays on until the
switch is turned off.
Note: This circuit can activate
without a remote control, due
to infrared in sunlight or some
room lights. If this happens, try
moving to a dark room.
Remote
Infrared light can be given off by anything
warm. Sunlight and room lights emit some
infrared light, in addition to visible light. This
circuit is very sensitive, and may often be
activated without a remote control. TV remote
control receivers look for a sequence of pulses
that identify an infrared message directed to
their TV set model, so will not be activated by
sunlight or room lights.
3D Pictures