I need to send the text message of my computer to a remote device via wireless medium. I have to make both transmitter and 'text message receiving device'. How can i start my project?
Using a wireless transciever like this from Easyradio (there are many other manufacturers), you dont even need a microprocessor, just a MAX232 level convertor. Its RS232 in and out, easy.
The max232 will convert the uarts higher plus and minus voltage/serial data to 0-5v form so you to decode it with you lower voltage circuit and microcontroller.