README File

README.md

@@ -33,6 +33,17 @@ 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.
 
+The next image shows the connection for the circuits on the Atlas Scientific board.
+
+![enable_pins_3](28.png)
+
+According with the image, from left to right, we have the yellow circuit for dissolved oxygen, then the blue circuit 
+for ORP, the black circuit for temperature, and the green one goes for conductivity. Therefore, if it is neccessary 
+replace a circuit for a different one, it is always important to remember that the first space on the board from left to 
+right it is connected to pin 12 in the ESP32, the second space goes to pin 27, the third one has connection with pin 15, 
+and the last one goes to pin 33. It means that no matter what circuit you are using on the Atlas Scientific board, you 
+only need to specify on the code the correct pin for the connection with the ESP32 microcontroller.
+
 ## step3 function
 
 ![step3](25.png)