Here in this Instrcutable I'm presenting a simple Wireless notice board system made using two Arduinos and 434 MHz ASK RF Modules.
This system can be used in schools and colleges to flash a notice or message on a LCD. Multiple receivers can be used to receive the same message across the whole college campus.
The message to be displayed is given to the transmitting arduino from PC/Laptop via the serial monitor in Arduino IDE.
Let's get started!!
Step 1: Parts Required
1.Two Arduino boards(I'm using an Arduino Uno and one Arduino Mini)
2.434 MHz ASK RF module pair
3.16 x 2 LCD
5.10 k potentiometer
Step 2: Connection Diagram
Here's a brief about connection diagram.
First Arduino Uno is used as the transmitter. The data pin of 434 MHz Tx is connected to pin 12 of Arduino Uno.
The Tx module has 4 pins. Vcc goes to +5V,Gnd goes to Gnd, Ant is the antenna connect a small wire 10-12cm and data pin to pin 12 of Arduino.
The Rx module is connected to Arduino Mini. It also has 4 pins(some modules have 2 data and 3 gnd pins) Ignore them. The data pin is connected to pin D11 of Mini. Vcc and Gnd are connected to +5V and gnd respectively.Antenna is a long wire 10-12cm.
Step 3: Code
The code uses VirtualWire library for transmitting and receiver wireless data.
Transmitter.ino contains the code for transmitter arduino.
receiver.ino contains the code for receiver arduino.
Here's the library download and install it.