PH Meter

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Microcontroller Stuffs

If using in ADC mode, you can use the microcontroller to scale/offset. just set the offset a little above 0v and set 7pH to be about 2.5v. Then use the controller to sample the offset and scale test solutions, then calculate the ph of test sample. Like this for fixed point maths:

/* zero (7pH) ph meter */
void c_zeroPh(void) {
	m_cfg.phoset=delayADC(ADC_CH1);
	meterSave(); // save settings to eeprom
}
 
/* calibrate ph to 4.0 solution */
void c_scalePh(void) {	
	m_cfg.phscale=((long)(delayADC(ADC_CH1)-m_cfg.phoset)*10000)/-300;
	meterSave(); // save settings to eeprom
}
 
void c_readPh(void) {
	long pH;
	pH=((long)(delayADC(ADC_CH1,)-m_cfg.phoset)*10000/m_cfg.phscale)+700; // read the results
	printf("pH: %2i.%02i\r\n",(int)pH/100,(int)pH-(int)((pH/100)*100));
}

Temperature Compensation

Really need to add temp compensation to this project. seems to change by about .10pH for ever 5F change in temp. Need to research this more.