A proximity detector is gadget that detects when an object is nearby. There are 2 ways to build a proximity detector. One is mount the IR LED and the photo-transistor so that they face each other. Then the infrared light is detected by the photo transistor. If an object comes between the IR LED and the photo-transistor, the light is blocked, and the photo-transistor turns off.
The other way is to build a proximity detector is to mount the IR LED and the IR photo-diode 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 photo-transistor.
How to Build a Common-Emitter Proximity Detector
Parts
- Photo-transistor
- 33KΩ Resistor
- 330Ω Resistor
- IR LED
- 9-volt Battery or DC Power Supply
- Red LED
Schematic Diagram
 |
| Fig. Photoelectric Sensor |
Post a Comment