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doubt regarding 89c51 i/p


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Arpit

Tue Apr 17 2007, 05:05AM

[ Microcontroller n00b ]

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Joined: Wed Oct 04 2006, 09:15PM

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I am getting a sine wave from an band pass filter and using a schmit trggr ckt, i am shaping it as a square wave, i want it to feed to MCU. I am using 89c51 for operating a 12v relay( by generating PWM).
Now the problem is that i have to level shift the schmit trigger o/p (1.22v- 1.88v) to a digital pulse (h1gh or l0w) so as to use it to MCU i/p.
how can i do this?
can u plz help me?

Vth+ | |----| |----|1.88v
vth- |__| |__| |1.22v

_________0v
.
.
.
o/p reqd: .

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[ Edited Tue Apr 17 2007, 05:07AM ]

Ajay

Tue Apr 17 2007, 05:07AM

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use diode clamping circuit..

for level shifting. google it for more information of clamping circuits..

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helplease | 02 Dec : 09:32

guys can i ask how do u include reg_51.pdf and reg_52.pdf when compiling the program and burn?? reply asap

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can some one xplain me this ckt diagram http://www.8051projects.net/forum-t15090-last.html

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hello... does ny1 have info abt powerline communication

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Hi Ajay... How are you?

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Hello All....
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hi Ajay....

very gud evenng....thatzzz very easy name saumya linux in short (Saumyalnx)

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8051 Microcontroller Projects 8051 AVR tutorials PIC microcontroller, 8051 assembly language programming electronics and communication ECE CSE pdf ebooks library BE final year project ideas Embedded systems