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microcontroller based pH meter

hi I'm Ajay.I am doing a project on microcontroller based pH meter I am using micro controller IC AT89C52 and ADC0808.any one please help me for my project I need a circuit diagram and program source code of microcontroller based pH meter and also please tell me how could be I measure the pH value by using glass electrode? and how could be pH value calculated?.please help me.thank you.