Line Following Robot (AT89C2051)

Applying a high voltage can sometime damage to Ports, even it can damage the IC.

i meant will handling the mC with bare hands cause any damage to flash programming? i mean the static charge from our hands...can that happen?

Not it wont cause any damage.[8D]

.. Now i'm designing the gears and will have to mill it. I've designed the speed of the vehicle to 15cm per second...is it too fast? or can the mC handle it?

Yes it is too fast and the microcontroller cant track the line efficiently. keep it around 5-10cm per second.

Sir i think u've removed the program as the link could not be opened.

and there r some correction in the program when i downloded it earlier.
The ports selection is different in ckt. dia. and different in program.

When i tried to assemble the hex code it showen errors as 'commands after END command'.

Can u reply me.

Which assembler you are using. Use the online assembler to get the HEX file.

sir,
in the assembly code sensor i/ps are assumed equivalent to port 1.4- 1.7.
but in the ckt. diagram the sensor i/ps have been given to ports 3.0 -3.3.
and for the o/ps there are total six o/ps in total but in program there r only 4.[?] also there is there may be replacement for i/p ports and o/p ports.

am i right or am i making a silly mistake?
[?]

Also the port at which the LED connected is 1.7 as inthe ckt. diagram and it assumed as 1.0 in the program.

Can u correct the program?

Please chek the PCB for correct port connections. i will soon correct it in the circuit.