Infrared Induction Alarm Kit Electronic Circuit Welding Product Process Assembly Teaching Practice DIY

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1. Package parameters

Product model: TJ-56-371

Power supply voltage: DC5V (DC power supply)

Board size: 53*32mm

2. Function description

This circuit design can realize that the buzzer sounds when the hand approaches the infrared emitting tube and the infrared receiving tube.

The LED lights up, and the sound stops immediately after the hand is removed, and the LED lights go out, so the sensitivity is very high. should

The idea of circuit design comes from the life scene of the bank automatically opening and closing the door. When people walk into the bank, the door automatically opens.

Open, leave the back door and close automatically. Or taps from high-end restaurants such as Kendeji, when put in hand.

Under the faucet, the water automatically flows out, and after leaving, the water automatically turns off. The life scene in which this circuit is applied is very

Multi-circuit is a kind of circuit that circuit designers need to master. The infrared induction circuit is mainly made for the following purposes.

Learn the working principle and usage of infrared emitting tube and infrared receiving tube, and master the general operational amplification at the same time.

Practical application of comparator LM358 as operational comparator. After the successful production of this circuit, it must be debugged.

The corresponding effect can be achieved, and the relevant parameters can only be debugged after understanding the working principle of infrared induction circuit.

Count. Introduction of key components: the infrared induction circuit is composed of infrared emitting tube, D1 and D2.

The infrared induction circuit with adjustable resistor R3 and general operational amplifier LM358 as the core.

The sampling comparison circuit is composed of transistors 9012 V1 and V2, buzzer Y1 and LED D3.

The sound output and display circuit of the core components.