Hi!
I had this EZO conductivity circuit with the conductivity probe that worked perfectly until today. Today I was going to calibrate the sensor and removed it from its place. I then took the code that can be found on the https://files.atlas-scientific.com/Ardunio-I2C-EC-sample-code.pdf and connected as instructed. What I got when I switched the serial monitor to 9600, and input the message (K, 0.1) as instructed in the following tutorial: https://www.instructables.com/Atlas-Scientific-EZO-EC-Calibration-Procedure/, is the following output:
Every time I put in a command, it shows something similar. If I input "R" for read, it shows 0 on conductivity, TDS, and salinity and then prints "Failed". The EZO circuit shows blue for I2C, then a green blink for reading and then a double red blink that shows it didn't understand command, regardless of what command I input.
When I put it bakc to see if it stopped working, it had indeed stopped working with my own code. I tried to add "C,dry" commands to my own code but that outputs nothing in terminal when I ask it to.
I was very careful in handling my sensor. Does anybody know what might have gone wrong?