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current analog input...

 
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crushneck



Joined: 27 Nov 2005
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current analog input...
PostPosted: Wed Dec 28, 2005 7:47 pm     Reply with quote
can u guys help me how to program a current analog input which give an output to the lcd...? im using a PIC 16f877 with 4x20 LCD...
PCM programmer



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PostPosted: Wed Dec 28, 2005 8:04 pm     Reply with quote
Quote:
can u guys help me how to program a current analog input which give an output to the lcd..

Was this question answered by the code I posted at the end of this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=25488
crushneck



Joined: 27 Nov 2005
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PostPosted: Thu Dec 29, 2005 12:09 am     Reply with quote
not exactly...what i meant is to get the current value instead of voltage...did u noe how??
or if its similar...can u tell me the formula to get the current input??
kender



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PostPosted: Thu Dec 29, 2005 1:11 am     Reply with quote
connect your current output to ground through a resistor and measure the voltage on the high sideof the resistor with the A/D. V=IR.
SherpaDoug



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PostPosted: Thu Dec 29, 2005 8:12 am     Reply with quote
Check out the Maxim MAX471 and its app notes.
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1108
There is a wealth on information there.

In very basic terms you need the current to run through a shunt resistor which produces a very small voltage signal. Then you need to amplify the voltage to something the PIC A/D can use. You have to be careful what type of amplifier you use because the voltage to be measured is so close to the amplifier power supply voltage.
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