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Building a Fun and Smart Home with a DIY Smart Doorbell

  Title: Building a Fun and Smart Home with a DIY Smart Doorbell Introduction: In the exciting world of electronics, there's nothing quite as thrilling as creating your very own smart home gadgets. Today, we'll embark on a journey to build a Smart Doorbell using simple and easily accessible equipment like the Arduino Uno, an IR proximity sensor, and a buzzer. This DIY project is not only a fantastic introduction to electronics but also a step towards transforming your home into a tech-savvy haven. So, gear up, young inventors, as we venture into the world of smart homes! Materials You'll Need: 1. Arduino Uno: The brain of our smart doorbell, capable of processing information and controlling the connected devices. 2. IR Proximity Sensor: A nifty gadget that detects the presence of objects in its vicinity. 3. Buzzer: This component will be the voice of our smart doorbell, alerting you when someone approaches. Step 1: Setting Up the Arduino Uno: Begin by connecting your Arduin...
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Phone FM transmitter











  Phone FM Transmitter Component List:
T1 - BC559 Transistor
L1 - 4.5 Variable Coil
LED - Red LED
D1-D4 - 1N4004 Diode
C1 - 330pF Capacitor
C2 - 470pF Capacitor
C3 - 12pF Capacitor
C4 - 25pF Capacitor
R1 - 12K Resistor
R2 - 200 Ohm Resistor
R3 - 1K Resistor
ANT - 10cm / 4" wire
  Technical Specifications:
Voltage Supply: Powered by the telephone line
Frequency: 88 to 92MHz
Transmission Range: 100m / 300 feet


Phone FM Transmitter

This Phone FM transmitter connects in series to your telephone line and transmits the telephone conversation over the FM band when you pick up the telephone handset. Transmitted signal can be tuned by any FM receiver. The circuit includes an "On Air" LED indicator and also provides a switch which can be used to turn off the transmitter. A unique feature of the circuit is that no battery is needed to operate the circuit since power is taken from the telephone line. The transmitter uses only a short piece of wire aerial about 4" / 10 cm long to transmit the signal and some of the RF signal is also radiated through the telephone line itself. The circuit might be used to share or record conversations, but is not intended for illegal use.



circuit credit goes to electronics diy.com

Droid Electronics 
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