Infrared beam barrier and a proximity detector circuit with IC 555

infrared detector circuit

Welcome again ,Free circuit dot com have the circuit can be used as an infrared beam barrier and a proximity detector.
The circuit uses the very popular Sharp IR module (Vishay module can also be used). NOS pin. circuit is shown in the Sharp and Panasonic modules. For other modules please refer to the relevant datasheets.
The receiver consists of a 555 timer IC  working as an oscillator at about 38Khz (also works from 36kHz to 40kHz), which must be configured using the standard 10K. The duty cycle of the IR beam is about 10%. This allows us to more current through the LED, allowing a greater range.
The receiver uses a sharp IR unit. If the IR beam from the transmitter IR drops, the output is activated, which activates the relay and turns off when the beam is blocked. The relay contacts can be used to turn ON / OFF alarm, lights etc. The 10K advance should be adjusted until the receiver detects the IR beam.
The circuit can also be used as a proximity sensor that objects in front of the device detects without obstructing a IR beam. So the LED has the same direction as the IR module and at the same level. The proposed scheme is shown in diagram. The LED should be adequately covered with a reflective material like glass or aluminum plates on the sides to stop the spread of the IR beam to prevent and get a sharp focus the beam.
When there is nothing for them, the IR beam reflected on the unit and therefore the circuit is not activated. When an object comes near the device, the infrared light from the LED reflected from the object on the unit and therefore the circuit is activated.
If there is still a very bad start, use a 1uF or higher capacitor instead of the 0.47uF.