README File

README.md

@@ -7,4 +7,31 @@ measured, but these printed numeric data to be separated by commas so that it tu
 the printed information into a .CSV file, since this is the most common format used for data analysis with the Python 
 language tools we work with.
 
+## I2C address and device list
 
+![i2c address](21.png)
+
+![device list](22.png)
+
+In the code lines 21 to 25, we have added instructions for the conductivity and dissolved oxygen circuits, including 
+also the I2C addresses corresponding to each one of them. In this case, we have removed the instruction for the pH 
+circuit since this parameter at the end was not considered as representative in the specific application that was being 
+developed.
+
+In the code lines 27 to 33, the names of the conductivity and dissolved oxygen circuits are added to the _device list_
+so that we can refer to them using their corresponding names.
+
+## Enable pins in the microcontroller
+
+![enable_pins_1](23.png)
+
+![enable_pins_2](24.png)
+
+In the line 41 of the code, we need to set the pin number needed for our dissolved oxygen circuit, corresponding
+with the connection this circuit will have with the ESP32 microcontroller.
+
+In the **setup** function, we also need to set up the **pinMode** for the added circuits, specifically if they need 
+to have a **LOW** or **HIGH** digital value in the corresponding circuit.
+
+## step3 function
+hh