Analog pH meter V2 calibration problem
Uncle-Phil 2022-08-01 19:04:04 758 Views1 Replies My sensor fails calibration in the phMeter library. Looking at the library code, the voltage range for pH 4.0 should be as below:
if((this->_voltage>1322)&&(this->_voltage<1678)){ // buffer solution:7.0{
}else if((this->_voltage>1854)&&(this->_voltage<2210)){ //buffer solution:4.0
My device reads about 1750 for pH 4.0 and 2250 for pH 7.0
Is it faulty?
2022-08-09 20:00:47 
Winster
Try these steps:1. Ensure that the sensor power supply is 5V stable;2. Keep the adapter dry (you can use a hair dryer to dry the surface)3. Use the code at the bottom of the wiki to clear the EPPROM cache and re-upload the calibration code.
Winster 
