27-06-2017, 11:12 AM
Simulation of automatic doorbell with object detection
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automatic doorbell using object detection ppt
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Simulation of automatic doorbell with object detection
29-06-2017, 11:03 AM
An automatic doorbell system
The "electric bell" is an electromagnet and a mechanical bell. When the electric current is applied to the bell, it produces the sound. Electric bells are used in many places such as on the telephone, railroad crossing, fire, school bells and etc.,. Instead of the electric bells they are using electronic probes.
![[Image: Electric-Bell.jpg]](http://www.edgefxkits.com/blog/wp-content/uploads/Electric-Bell.jpg)
The following circuit diagram shows the circuit diagram of an automatic doorbell system with object detection. The circuit consists of an ultrasonic transmitter and the receiver modules are used to detect the person. If the person is detected by the IR sensor, then the buzzer will automatically produce the sound.
The frequency of the ultrasonic transmitter is around the 40 KHz that we can consider that the ultrasonic waves can transmit continuously around 40KHz. The range of the transmitter is one or two meters and the power supply will be moderate. If the power of the transmitter is less than one meter, if the person is away from the meter, then there is the possibility of not being detected by the person. If the rage is very high then it can be cause of a false shot, we can say that if the person is too far from the door, then he is considered as a visitor and produce the sound of the alarm. To overcome this problem, the power of the transmitter is maintained at an optimum level.
![[Image: Circuit-Diagram-of-Automatic-Doorbell-System.jpg]](http://www.edgefxkits.com/blog/wp-content/uploads/Circuit-Diagram-of-Automatic-Doorbell-System.jpg)
In the circuit the variable resistance 500kohm is used to tune the sensitivity of the receiver and if we rotate this correctly then the result will be desired. The output of the circuit is given to the buzzer circuit, which produces the beep and acts as a bell in our case.
In the receiver module, the circuit uses the LM324 IC and internally has four op amplifiers. Of the four operating amplifiers we are using only three op amplifiers and the other is not used, but the requirement is necessary in our case. The three operating amplifiers are in the cascade arrangement to produce high gain output and no noise. There must be a distance between the circuit and the door bell, using the Opto-coupler the distance between the circuit and the door are considered.
The "electric bell" is an electromagnet and a mechanical bell. When the electric current is applied to the bell, it produces the sound. Electric bells are used in many places such as on the telephone, railroad crossing, fire, school bells and etc.,. Instead of the electric bells they are using electronic probes.
The following circuit diagram shows the circuit diagram of an automatic doorbell system with object detection. The circuit consists of an ultrasonic transmitter and the receiver modules are used to detect the person. If the person is detected by the IR sensor, then the buzzer will automatically produce the sound.
The frequency of the ultrasonic transmitter is around the 40 KHz that we can consider that the ultrasonic waves can transmit continuously around 40KHz. The range of the transmitter is one or two meters and the power supply will be moderate. If the power of the transmitter is less than one meter, if the person is away from the meter, then there is the possibility of not being detected by the person. If the rage is very high then it can be cause of a false shot, we can say that if the person is too far from the door, then he is considered as a visitor and produce the sound of the alarm. To overcome this problem, the power of the transmitter is maintained at an optimum level.
In the circuit the variable resistance 500kohm is used to tune the sensitivity of the receiver and if we rotate this correctly then the result will be desired. The output of the circuit is given to the buzzer circuit, which produces the beep and acts as a bell in our case.
In the receiver module, the circuit uses the LM324 IC and internally has four op amplifiers. Of the four operating amplifiers we are using only three op amplifiers and the other is not used, but the requirement is necessary in our case. The three operating amplifiers are in the cascade arrangement to produce high gain output and no noise. There must be a distance between the circuit and the door bell, using the Opto-coupler the distance between the circuit and the door are considered.
It can be understood in the following video:
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