Traditional doorbell systems often require extensive wiring, intricate assembly, and the expertise of a qualified electrician for installation. In contrast, wireless doorbells offer a simpler installation process compared to their wired counterparts.
With a lack of complicated wiring, a wireless call bell can be easily installed by anyone within a household.
This article demonstrates the process. Here we incorporate an encoder and decoder for the creation of a wireless call bell system.
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Table of Contents
The prototypes for the author’s transmitter and receiver are depicted in Fig. 1 and 2 respectively.
| Parts List | |
| Semiconductors: | |
| IC1 | -HT12E encoder |
| IC2 | -HD12D decoder |
| T1 | -BC547 npn transistor |
| LED1 | -5mm LED |
| Resistors (all 1/4-watt, ±5% carbon): | |
| R1 | -1-mega-ohm |
| R2 | -33-kilo-ohm |
| R3, R4 | -1-kilo-ohm |
| Capacitors: | |
| C1, C3 | -100μF, 16V electrolytic |
| C2 | -0.01μF ceramic disk |
| Miscellaneous: | |
| S1 | -Push-to-on switch |
| S2 | -On/off SPST switch |
| CON1, CON2 | -2-pin connector |
| TX1 | -433MHz RF transmitter |
| RX1 | -433MHz RF receiver |
| PZ1 | -Buzzer |
| ANT.1, ANT.2 | -25-30cm wire |
| Optional: | |
| RL1 | -5V, SPDT relay |
| D1 | -1N4007 rectifier diode |
| CON2, CON3 | -2-pin connector |
| -230V based call bell | |
Wireless Call Bell – Circuit Diagram
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Sir,
Thank you for the useful project.
In the parts list
IC2 mentioned as HD12D decoder IC.
IC2 should be HT12D decoder.
Thx.
Thanks for detecting this error and sharing with us.
Regards