Wireless Doorbell using 433 MHz Reciever and Transmitter module

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Sometimes you have sitting in the backyard of your house and couldn’t hear that someone is continuously ringing the doorbell. However, it becomes quite embarrassing to await your guest at the door for several minutes. To avoid this situation, I am going to give you a detailed step-by-step instructional tutorial on “Simple Wireless Doorbell using 433 MHz Reciever and Transmitter module”.

Whenever the doorbell is pressed, the transmitter module sends a signal to the receiver module. Therefore the receiver module activates the buzzer connected to it. Both the receiver and transmitter circuit is connected wirelessly.

Hardware Components

The following components are required to make Wireless Doorbell Circuit

For Transmitter Circuit

S.no	Components	Value	Qty
1	Transmitter	433 MHz	1
2	Copper coil for antenna	15 to 20 turns	1
3	Button	–	1
4	Lithium-ion Battery	3.7 Volts	1

For Receiver Circuit

S.no	Components	Value	Qty
1	Receiver	433 MHz	1
2	Copper coil for antenna	15 to 20 turns	1
3	LED	–	1
4	Buzzer	–	1
5	Lithium-ion Battery	3.7 Volts	1

Circuit Construction

Step# 01

For the transmitter circuit, connect the 433 MHz transmitter to the PCB board.

Step# 02

Connect the antenna to the 433 MHz transmitters.

Step# 03

Now, connect a push button to the receiver circuit.

Step# 04

For the receiver circuit, install a 433 MHz receiver on the PCB board.

Step# 05

Connect antenna on the 433 MHz receiver,

Step# 06

Now connect the LED positive terminal on both data pins of the receiver module while the negative terminal is on the ground.

Step# 07

Now connect the positive terminal of the buzzer to both the data pins of the receiver module and the negative terminal on the ground.

Step# 08

Power both the receiver and transmitter circuit with 3.7 Volts lithium-ion batteries.

Circuit Operation

The operation of the wireless doorbell circuit is quite simple to comprehend. The receiver circuit gets the signal from the transmitter module and likewise activates the buzzer. Additionally, LED is used to indicate whether the signal is receiving or not. Both circuits are powered by two 3.7 Lithium-ion batteries, you can also use any other DC power source of 3.7 – 5 volts.