I want to build a simple transmitter which can connect to the computer via the parallel or the serial port and was wondering if anyone can help. I want to be able to send a value to the port (a number of some sort) and then the transmitter will transmit it for me. I then want another computer to recieve it again via parallel or serial port and read in the number sent. If anyone can help with any part of this be it schematics for building the simple transmitter or reciever it will be greatly appreciated.
If you have any links could you also please tell me, thx for all your help