Posted on Feb 6, 2014

The above circuit uses RS232 for interfacing with PC. It is very simple circuit & works very well with PC. Power is drawn from usb port OR needs external supply of 5V. The value of the crystal is very critical at AT89C2051 and must be 11. 0592MHz. Here AT89C2051 is loaded with firmware required for RS232 communication with PC. Assemble the circuit a

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nd burn the firmware into an AT89C2051 (you will need a conventional parallel Programmer to Program the AT89C2051). Use the 40 pin ZIF socket for microcontroller. The firmware(. HEX) file is in the Software folder. All the required documents and Files are attatched. 1) Don`t panic if computer is not able to detect kit Please check all the connections on the board. While designing circuit manage to make jumper-less circuit. 4) Check voltage level at the two pins of the crystals it should be approx. 0. 7 - 0. 27V. When you run the software for the first time it looks for a valid programmer on COM1. If the Programmer is connected to say COM2 you will receive an error message but when the application starts select Options->Settings on the Menu and specify the correct COM Port. In this circuit power is drawn from usb port itself, so no need of external power supply. Led at the bottom is connected to p2. 7 for testing purpose. you can write program to turn on & off the led. led is connected in sinking mode. FT232 is an SMD, its on the bottom side of the board so you can see only 2 ICs in the above circuit.

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