HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAME

[oister]

hi,
am new to microcontroller.i have been assigned a project of calculator.i am stuck on one thing that when i have to give input through keyboard to microcontroller my pc voltages and 8051 microcontroller voltages are not same.so what device i must use in between them to make my pc and microntroller voltages same.do i have to use voltage converter.please elaborate.thank u.

 

[amol_shah]

Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM

u want to interface the keyboard directly to the controller? or do u want to send the key pressed through the PC to the controller?

 

[melc]

Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM

hi,
am new to microcontroller.i have been assigned a project of calculator.i am stuck on one thing that when i have to give input through keyboard to microcontroller my pc voltages and 8051 microcontroller voltages are not same.so what device i must use in between them to make my pc and microntroller voltages same.do i have to use voltage converter.please elaborate.thank u.

Please ask a good question and you've got a good answer. How the heck you want the reader knows what are exactly your voltage levels? Every problem may have a particular solution. Ask yours again.

 

[oister]

Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM

yup i have to interface microcontroller through keyboard and i am using parallel port for it and thank u amol.

 

[amol_shah]

Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM

if u are using parallel port u can interface it directly to the controller as i suppose you will be using 5v controller. If you are using serial port then you will have to use MAX 232 IC.

 

[randell_xtian]

Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM

amol_shah is correct...the parallel port connection has 1 VCC of 5V and Multiple ground. The source voltage of the controller must same to the source voltage of the PC and must be have common connection....

 

[lunar]

u can use a buffer in between parallel port and your controller for protection of the port, because sometimes when working with parallel port u tend to damage your port by little short circuit or over current to the port.

 

[senthilkumar]

use level converter

 

[oister]

Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM

thanks to all n i have donate pts to all of u. thank u

 

[amredries]

Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM

to interface with computer
you have 2 possible voltage interface 12V(as serial or RS232) and 5v(as parallel Port )

for 12volt use MAx232
for 5 volt you don't need anything to change voltage