Loublet Schematic

How to Build a Common-Emitter Proximity Detector

A proximity detector is gagdet that detects when an object is nearby. There are 2 ways to build a protximity detector. One is mount the IR LED and the phototransistor so that they face each other. Then the infrared light is detected by the phototransistor. If an object comes between the IR LED and the phototransistor, the light is blocked, and the phototransistor turns off.

The other way is to build a proximity detector is to mount the IR LED and the IR photodiode next to each other facing the same direction. When an object comes near the IR LED, some infrared light will bounce off the object and be detected by the phototransistor.

How to Build a Common-Emitter Proximity Detector

Parts

Phototransistor

33KΩ Resistor

330Ω Resistor

IR LED

9-volt Battery or DC Power Supply

Red LED

Schematic Diagram

Proximity Detector Circuit

Posted by Unknown at 3:45 AM

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Labels: circuit, detector, PROXIMITY, simple