Software for projects -AT2313IR V1-1 .AVR-Based Serial Port IR Receiver
This is a simple IR receiver circuit which plugs into a serial port of a computer. Okay, there are many other circuits of this kind, and most of them are even simpler, but this circuit has two major advantages: (1) it uses an Atmel AVR RISC microcontroller (an AT90S2313) instead of the usual PIC microcontroller and (2) it uses a Maxim MAX232 for the generation of valid RS232 levels.
Advantage 1 is, of course, only valid for all those AVR addicts which have this device (and the corresponding programmer) ready at hand and don’t care about PICs and PIC programmers. Advantage 2 comes into play if the IR receiver has to placed at a great distance from the computer; the MAX232 is more likely to deliver valid signals over bigger distances than cheaper solutions.
The IR receiver can receive it’s +5V supply voltage from the keyboard or mouse connector of the computer (either from an unsued PS/2 port or via a pass-thru adaptor). If the IR interface is placed at a great distance from the computer, I power it with an external stabilized 5V DC power supply instead of the PS/2 port.
The interface communicates at 19200 baud, unidirectionally (that means, it only transmits data and does not care anything about data which the computer send), without flow control. For every level transistion in the demodulated IR signal, it transmits a single byte which corresponds to the time since the previous transistion, capping off at a value of 255. It works reliable with a Sony remote control (using the special Sony protocol), and I have also succesfully tested it with an Onkyo remote control (I think this one uses the standard RC5 protocol, but I’m not shure). Decoding happens on the computer; I use PC Remote Control for this.
Okay, ’nuff said, here’s the schematic (changed on July 08, 2002 to correct wrong connections to the MAX232). Obviously, it uses european symbols.
In this project LEDs will be used for Red, green and yellow lights. There will be sanding glass image to show red light and time left. no. of glowing leds will decrease with time left respectively. go , wait and stop will show matrix led array on green, yellow and red respectively.
project is Quite interesting.
Controllers used for controlling is 89s52. 5nos. ICs controller required for this project.
Matrix led RGB leds required .
Laptop based device control is very interesting projects .
firstly we worked on Parallel port – 25 pin pink colour connector backside of our CPU desktop.
it was very easy to do . only you need a communicating software in c, C++ or vb or in any other language. but after that mostly manufacturer stopped parallel port in motherboard.
then after data we worked on it.