Infrared Sensor Alarm Circuit Kit Diode Electronic Technology Welding Assembly Teaching Practice Parts

Function introduction This circuit design can realize that when the hand is close to the infrared transmitting tube and the infrared receiving tube the buzzer will sound and the LED light will light up When the hand is removed it will stop sounding and the LED light will go out The sensitivity is very high The circuit design idea comes from the life scene of the bank automatically opening and closing When a person enters the bank the door opens automatically and the door closes after leaving In other words it comes from the faucet in restaurants such as KFC When the hand is placed under the faucet the water will flow out automatically and the water will automatically shut off after leaving There are many life scenarios for this circuit application and it is a circuit that circuit designers need to master The production of infrared induction circuit is mainly to learn the working principle and use method of infrared transmitting tube and infrared receiving tube and to master the practical application of general operational amplifier LM358 as an operational comparator After the circuit is successfully manufactured it must be debugged to achieve the corresponding effect Only after understanding the working principle of the infrared induction circuit can the relevant parameters be debugged Introduction of key components The infrared sensor circuit consists of an infrared sensor circuit with an infrared transmitter tube D1 and infrared receiver tube D2 as t