In this DIY, we are demonstrating a project of a mobile phone-activated wireless remote control doorbell. The circuit is also used as a mobile phone detector so it can be utilized for finding a mobile phone. The circuit is very delicate and it can detect a phone from 10 to 20 meters away. The detecting range will be different for different mobile phones. The circuit is worked with low-cost segments.
The fundamental part of the circuit is the LM358 dual operational amplifier IC. A UM66 melody generator circuit is associated with the output of the circuit.
Hardware Components
The following components are required to make Wireless Remote Control Doorbell Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1 | IC | LM358 | 1 |
| 2 | Battery | 5-12V | 1 |
| 3 | Melody Generator IC | UM66 | 1 |
| 4 | Transistor | 2N4401, 2N4403, 2N3904 | 1, 1, 2 |
| 5 | Zener Diode | 3V | 1 |
| 6 | Diode | 1N34 | 2 |
| 7 | Resistor | 1K, 47K, 470K, 470R, 1MR, 220Ω | 2, 1, 1, 1, 1, 1 |
| 8 | Antenna | 3.5inch | 1 |
| 9 | Capacitor | 560µF, 0.1µF, 470µF | 1, 1, 1 |
| 10 | Speaker | 8Ω | 1 |
LM358 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of LM358
UM66 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of UM66
Wireless Remote Control Doorbell Circuit
Circuit Operation
At the point when a mobile phone signal is received the circuit will actuate the UM66 melody generator IC for 30 to 40 seconds and afterward, it will automatically go off. The current utilization of the circuit is low and in reserve mode, it just utilizes 0.5mA, because of which the batteries will last from half a month to months. It additionally relies upon the kind of battery you are utilizing, for example, an alkaline type will last more.
The sensitivity of the circuit can be balanced with the 1M variable resistor. Utilizing a major size variable resistor or potentiometer will make the adjustment simpler. For the antenna use any 3.5inch wire. A thin enameled wire of #24 or #26 will likewise function well. For best execution fit the circuit in a reasonable walled-in area with the antenna inside. The diodes value isn’t basic and any similar germanium diodes will work.
Applications and Uses
The circuit can be used as a calling bell and can also be used as a mobile phone detector.
