@allObjects howdy. It has been awhile since I updated my status on this project/your code. Turns out, the PH sensor that I am using from atlas-scientific is a bit older and buggy which in turn doesn't give me proper readings so I resorted to checking my water ph using the old fashioned method i.e. using the General Hydroponics Test Kit solution. I guess doing things the "old fashioned" way gets the job done :-)
Now, I'm looking for another project for the espruino.