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oister
Joined: 02 Nov 2008
Posts: 41
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 15 Dec 2008 16:49 HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAME |
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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.
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amol_shah
Joined: 21 Apr 2008
Posts: 117
Helped: 14
Location: Nasik, Mumbai
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15 Dec 2008 19:01 Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM |
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| 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?
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melc
Joined: 08 Apr 2005
Posts: 394
Helped: 45
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15 Dec 2008 20:18 Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM |
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| oister wrote: |
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.
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oister
Joined: 02 Nov 2008
Posts: 41
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15 Dec 2008 20:40 Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM |
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| yup i have to interface microcontroller through keyboard and i am using parallel port for it and thank u amol.
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amol_shah
Joined: 21 Apr 2008
Posts: 117
Helped: 14
Location: Nasik, Mumbai
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16 Dec 2008 4:53 Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM |
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| 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.
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randell_xtian
Joined: 25 Mar 2008
Posts: 158
Helped: 9
Location: Philippines
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16 Dec 2008 11:06 Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM |
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| 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....
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lunar
Joined: 07 Mar 2006
Posts: 12
Helped: 2
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17 Dec 2008 8:05 HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAME |
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| 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.
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senthilkumar
Joined: 24 Nov 2001
Posts: 668
Helped: 4
Location: india
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17 Dec 2008 10:29 HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAME |
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| use level converter
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oister
Joined: 02 Nov 2008
Posts: 41
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17 Dec 2008 13:38 Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM |
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thanks to all n i have donate pts to all of u. thank u
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17 Dec 2008 13:38 Ads |
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amredries
Joined: 09 Jul 2004
Posts: 48
Helped: 1
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17 Dec 2008 18:27 Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM |
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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
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