markdem
Member level 3
Hello all, I have finaly got my PH reading device going. The only problem now is that when i do read the ADC value, it keeps jumping around. I can read the opamp output with a multimeater, and it is very stable, but when i attach the ADC, it will go up and down about 150 steps. I am using a 12 bit ADC so the whole range is only 0-4095, so a change of 150 is quite high when i am mesuriung PH. I have tried to add bypass caps before the ADC, about .1µf, but it did not help. Can anyone please give me some tips on what i can do to make the ADC abit more stabe.
Thanks, Mark
Thanks, Mark