Project Idea
This project enables secure transmission of secret messages via RF technology. Users type messages through a computer keyboard, which are encoded with a secret code using an 8051 microcontroller and sent wirelessly through an RF transmitter. At the receiving end, the RF receiver requires the correct secret code input to decrypt and display the message on an LCD, ensuring confidentiality.
 
Project Description
Designed for military, government, and sensitive communication needs, this system transfers confidential messages securely over radio frequencies. The 8051 microcontroller handles message encoding and decoding, while the RF modules wirelessly send the encrypted data. The receiving terminal accepts messages only upon entering the correct code, displaying them on an LCD. This prevents unauthorized access and maintains message secrecy.
 
List of Components
8051 Microcontroller (AT89S52)
433 MHz RF Transmitter Module
433 MHz RF Receiver Module
Computer Keyboard interface (via UART/serial interface)
LCD Display (16x2)
Crystal Oscillator (11.0592 MHz)
Voltage Regulator (7805)
Push Buttons (for entering secret code)
Resistors, Capacitors
Power supply (5V regulated)
Connecting wires and PCB
 
Features
Secure wireless message transmission via RF
Keyboard input encoding with secret code
Code-based message decryption at the receiver
Real-time message display on LCD
Simple microcontroller-based implementation
Suitable for sensitive communications
 
Applications
Military communication systems
Government secure message transmission
Private and confidential wireless communications
Remote control devices requiring security
Educational projects on secure wireless communication
 
Project Includes:
Fully assembled and tested circuit
Circuit diagram
Source code 
(For DIY KITs - only the components will be provided)
 
Project Types:
DIY KIT(Do IT YourSelf KIT) - We are providing only components in this kit for this project
DIY KIT with Code & Circuit Connections - Along with the components, you will get the Code and the Circuit Connections file to help you build the project easily.
Readymade Breadboard - We are providing fully assembled, tested and ready-made project using plug-n-play jumper wires and breadboard with all the other components, code & circuit diagram.
Readymade Soldered - We are providing fully assembled, tested and ready-made project soldered on a PCB with all the other components, code & circuit diagram.
 
Dimensions (Approximate)
PCB size: 10 cm x 8 cm x 2 cm
RF Modules: 4 cm x 2 cm x 1 cm each
LCD: 8 cm x 3 cm x 1.2 cm
Total assembled device fits in a compact box approximately 12 cm x 10 cm x 4 cm
 
Shipping Dimensions
Package size: 15 cm x 12 cm x 6 cm (including protective packaging)
 
Weight
Approximate project weight: 250 grams
 
Estimate Project Weight: 1kg
 
Notes: All the products are made by LearnElectronics India and not for re-sale.