TOUCHLESS DOOR BELL USING PROXIMITY SENSOR

 TOUCHLESS DOOR BELL USING PROXIMITY SENSOR

EXPLAINATION & WORKING 

We all have a doorbell at our homes . When a guest comes to our house , they search for the door bell switch and then ring it to let us know their presence . If who came to our house and unable to find doorbell , else person is so short then they cannot find the doorbell in this case we need a solution that can find the presence of a person and rings the doorbell automatically .

Here we are producing something that can be a sensing based “TOUCHLESS DOORBELL” by using “INFRARED RADIATION PROXIMITY SENSOR” with some locally available components .

It can detect the presence of a person and then if the person is detected ,the door bell is automatically turned “ON” when the person is infront of the door .

WORKING AND CONSTRUCTION

This project is made up of IC LM358 dual comparator ,IR transmeter and receiver, some variable resistance ,some LEDS and some resistance . As an output purpose we have used a buzzar .

 First a 9v battery source is being connected with an IR led light which is also connected with 220 ohm register and it shows that IR LED is switched ON with an infared light is coming out . Now if we take any object or our hand and the light is going to reflect ,this reflection will be received by an another IR sensor which is connected in series with 10k ohm register . When the IR sensor is reflecting its light then it also passes some current through 10k registor. With this 10k registor an IC LM358 (OPAMP) is connected. Here Lm358 is being used as an comparator. When an IR sensor passes the non-holding signal to the OPMAP it become set which means it produces an high output signal. This output signal is captured by the buzzar and a red LED starts glowing. For producing high frequency from the buzzar we have connected BC547 (a transistor) which is helping us to convert the voltage into 9v.

Components used 

1. 220 ohm resistor
2. 10k ohm registor (for this variable potentiometer can also be used)
3. Buzzar
4. IR sensor
5. LM 358
6. BC – 747
7. Battery
8. Battery caps
9. P.C.B board

CIRCUIT DIAGRAM :-

IN CASE OF LED LIGHTS WE HAVE USED BUZZER.

TO KNOW HOW IT IS WORKING PLEASE CLICK THE LINK BELOW
 https://youtu.be/M8fRoG2my5g

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