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Anonymous Poster

Analog to Digital Conversion By Pic Microcontroller

02/21/2009 10:53 AM

I want to know how a Pic Microcontroller can be used for analog to digital conversion ???? can u give some code in C or Assembly language...

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Electroman
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#1

Re: Analog to Digital Conversion By Pic Microcontroller

02/21/2009 4:01 PM

Assuming you don't use a PIC micro with an A to D built in and you're not after great accuracy.

The simplest way would be to use an I/O pin with a capacitor and resistor on it and time the charge onto the capacitor to change state, then changing the I port to an output port discharge the capacitor and repeat....

Use a simple lookup table to convert from an exponential voltage related to charge to a linear V vs charge and its done!!!

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Mikerho
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#2

Re: Analog to Digital Conversion By Pic Microcontroller

02/21/2009 9:02 PM

Guest,

There are many PICs that have analog inputs already. Seeing that PICs are relatively cheap, I would purchase one of these. Most are 10-bit.

Mike

BTW, GA Electroman!

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