PH electrode to pic (choosing module help)

[gigo_gigo88]

hello i am currently looking to design a PH meter for my university project that transfers data to PC via bluetooth connection i have done most of the parts but im confused on what ph electrode is best to use with pic18f4520

any idea on which PH electrode to use that gives good PH to voltage conversion?

 

[wp100]

Hi,

Cannot find the original post but this may help.. I used it with a 4520.

 

[gigo_gigo88]

so the electrode on measure the PH then i have to convert it to voltage ? i was thinking of using this LUTRON PE03
LUTRON PE03 then the output will go to 2 stages opamps with noise elimination the to the pic analogue channel what do you think ?

does the electrode gives voltage or i need to build a circuit to get it?

 

[wp100]

Hi,

Its seems a standard ph probe so should be fine.

You need a circuit like the one shown in that pdf , stage one very high impedance amplifier, the ph probes small voltage is + and - so it needs the second stage to make it a 0 - 5v pic compatible signal, the 3rd and 4th stages are noise filters.

 

[kak111]

I hope you find some help here...............

PH Meter - ProjectWiki

**broken link removed**

pH/ORP Adapter for MCU
Phidgets Inc. - Unique and Easy to Use USB Interfaces

A tiny and accurate pH-meter: from schematic to calibration

 

[gigo_gigo88]

thanks alot guys this should do the job

 

[gigo_gigo88]

is there any way to display floating point numbers on an lcd display or should i change it to a graphical lcd?

 

[kak111]

Check this.............

LCD Design with PIC® Microcontrollers

What’s New!
Segmented LCD Designer GUI
• Segmented Display GUI makes it easy to generate the code needed to drive LCD displays
• Just drag & drop to customize your display and the tool will generate the code for you
Free, new and integrated features with MPLAB® IDE v8.20 or higher

**broken link removed**