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pH sensor using microcontroller

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jovin555

jovin555

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can anyone give me a circuit design for reading pH value using pic16f877a or atmega8 ....i need an input voltage range of 0-5v...0v corresponding to 0pH and 2.5v for 7pH and 5V for 14pH....or anyother circuit for reading pH value that had been tested by anyone??
 

Hi,

There are lots of ph amplifiers on the web.

Here is one I made earlier.
 

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thanks everyone for ur help...got it finally working...ur circuit really worked..wp100....and dr was only one mistake in that circuit....the -5 and +5 volt for tl084 was wrong...
 

jovin555 said:
thanks everyone for ur help...got it finally working...ur circuit really worked..wp100....and dr was only one mistake in that circuit....the -5 and +5 volt for tl084 was wrong...
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Hi,

Sorry forgot to mention that error on the diagram, though the pcb is correct, you have soon built it , do you work in a component shop!
 

nope...i am working at a project centre..and we have all facilities here....

- - - Updated - - -

do you have the code for that ph sensor circuit?am doing it using pic16f877a..u have any code for that?
 

do you have the code for that ph sensor circuit?am doing it using pic16f877a..u have any code for that?
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Hi,

My code is in assembly and part of a much larger program, difficult to extract.

You just need to do a simple ADC read and display the value as detailed on page 7 of that manual.
 

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