Supersonic Alarm

The setting of the alarm equipment

Make the variable resistor for the distance setting the maximum distance. Install the sensor in the direction which detects the obstacle. If the LED of the alarm equipment doesn't light up, it is OK just as it is. Confirm in the operation. When the LED lights up, turn the variable resistor for the distance setting counterclockwise until the LED disappears

The operation confirmation of the alarm equipment

Place the obstacle(Yourself is OK) in the detection area of the alarm equipment and confirm that the alarm comes out. Above, the alarm equipment became the condition which can give the alarm. Even if the obstacle leaves the detection area, the alarm output continues for the about 1 second.