plz plz

i wanted to control a devices like fan or light, using mcu and the signal will be receive by the mcu came from the pc ,in the serial port.......but i dont know how to prog it for serial port to detect...
plz plz

i wanted to control a devices like fan or light, using mcu and the signal will be receive by the mcu came from the pc ,in the serial port.......but i dont know how to prog it for serial port to detect...
plz explain!!

Thank you sir...... But can u clarify me whats the difference between port P0 and pins of P0 I maen when we see the output of my program in port P0 we have two things: P0: pins: Whats does both...
question plz

you do code to read a microsd card in croatia.
plz query

sir , My simple program is LCD display using CX 51 is given below. In the program compiling peroid no other errors and warning are occured. But the obj file for those program stored in the microconroller...