This project presents a Land Phone Enabled Hooter–Siren system designed for instant audible alert generation using an existing landline telephone network. The system uses a PIC microcontroller as the central control unit, interfaced with a land phone line to detect incoming ring signals. When a call is received on the connected land phone, the microcontroller processes the signal and activates a relay-driven hooter or siren, providing a loud and immediate alert. A regulated power supply ensures stable operation of the entire circuit, while a crystal oscillator provides accurate clock timing for reliable microcontroller performance. LED indicators are included to display system status such as power ON, call detection, and hooter activation. A reset button allows manual restarting of the system for safety and maintenance purposes. This land phone enabled hooter system is simple, cost-effective, and highly reliable, making it suitable for applications such as industrial alert systems, emergency notification, security alarms, hospitals, factories, railway stations, and public warning systems, especially in areas where mobile or internet connectivity is unreliable.  

The main objectives of this project are:

• To design a system that activates a hooter or siren automatically when an incoming call is received on a land phone.
• To use a PIC microcontroller for reliable detection and control of landline ring signals.
• To provide an instant audible alert for emergency and security applications.
• To ensure safe and isolated operation of the hooter using a relay interface.
• To indicate system status and operation through LED indicators.
• To maintain stable and continuous operation using a regulated power supply.
• To enable easy system restart and fault recovery using a reset button.
• To develop a cost-effective and dependable alert system suitable for areas with limited mobile or internet connectivity.

 

The major building blocks of this project are:

1. PIC Micro controller.
2. Regulated power supply.
3. Relay,
4. LANDPHONE
5. Hooter

 

Software’s used:

• PIC-C compiler for Embedded C programming.
• PIC kit 2 programmer for dumping code into Micro controller.
• Express SCH for Circuit design.

   

Regulated power supply:

 

Block Diagram:

video: