Simple Infrared Light Barrier

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< PIC Project ~ Simple Infrared Light Barrier

eric

Posted: Sun Aug 27, 2006 10:17 am Post subject: Simple Infrared Light Barrier

Site Admin Joined: 01 Jan 1970 Posts: 311

application
the distance covered by the IR beam is relatively short,
the value of resistor R5 may be increased to save on current consumption.
Preset P1 is adjusted for a carrier frequency of 36 kHz
exactly (failing test equipment, adjust it for optimum range).
The receiver is equally simple and also based on a CMOS
555. As long as the sensor picks up infrared light from the
transmitter, the reset input of the 555 IC is held low and the
buzzer is silent. Components D1 and C2 act as a low-frequency
rectifier to cancel the effect of the 300-Hz modulation
on the transmitter signal. When the infrared light beam is interrupted,
the oscillator built around the 555 is enabled and starts
to produce a warning tone.
Finally, the test values indicated in the circuit diagram are
average dc levels measured with a DVM, under light/no light
conditions. In fact, most test

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