Wanna make a smart home? or wanna make your home look cool and scientific? You are at the right place. Today we are gona make IR Proximity Automatic Door bell. This bell is so cool. The buzzer will ring when someone wave their hands towards the sensor. No need to press the old dirty switch.
Components
*LM358 IC or any suitable OP-AMP
*IR Transmitter and IR receiver(Photodiode)
*Resistors (See circuit diagram for values)
*Active 5v Buzzer
*9v Battery
Working
LM358 is a dual channel op-amp. i.e. we can have 2 channels of input and two outputs. But here we are gonna use only one channel. The IR Transmitter (The one used in Tv remotes) will emit IR light. By applying voltage, we are emitting IR Light from it.
The IR receiver in another end will generate a voltage if it receives IR Radiation. This voltage will be applied as input to the op-amp. When the op-receives this input, it will generate 5v as output which is applied to the buzzer making it ring.
So, whenever someone waves their hand IR radiation will hit their hand get reflected and it will reach the receiver. Thus, it will make the buzzer shout. This is all about its working
Practical Implementation
To Implement this practically you need to do some modifications. You will need to buy or make a 220VAC to 9v DC converter and give it as input voltage because you cannot rely on 9V battery. Also, you need to reroute the buzzer to place it inside your house. You can also add additional circuits with this to generate some other sound.
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