I have this proyect my professor assigned related to pH in which I connect the pH probe provided by him to an Arduino that measures the pH in the solution (e.g. water). The thing is there are usually some modules that come with the whole the analog ph measurement kit that involve some op-amp and stuff, all those things I don't have. He told me to connect it directly but doing some reasearch I learned the negative pH damages the Arduino board and I need and amplifying phase so I can amplify mV to V. The problem is I really don't know what to use, which op-amp or how the wiring is made.
Below I'm attaching the wiring scheme that I searched and showed to my professor which he said it was okay and to do it. After much asking on and on I'm not sure of this.
And I'm broke so my Arduino being damaged? Sins and this.
There is no such thing.
Do you mean a negitave voltage from your PH sensor?
The thing is there are usually some modules that come with the whole the analog ph measurement kit that involve some op-amp and stuff, all those things I don't have.
Then you can’t make any measurements.
Below I'm attaching the wiring scheme that I searched and showed to my professor which he said it was okay and to do it.
Well it is not going to damage the Arduino. Then again it will do absolutely nothing. And anyway that is not a schematic it is a photograph!
that is definetly not the datasheet but i couldn't find anything else
One school of thought says that the device you have will automatically transform into the device you have the data sheet for. Another school of thought says this is crap. What do you think?
Without a data sheet you don’t stand a chance. Connecting a PH sensor to a digital pin shows you know nothing about PH sensors nor digital pins. What are you hoping to see?
Input impedance of your analog inputs of the Arduino is too low by at least three orders of magnitude to read an pH probe. That's why it won't work. There's a reason a pH probe connects to a shielded wire and BNC connector, instead of a regular wire!
