Hello there!
From what I was reading in the website about Arduino Nano ESP32, the voltage allowed through the pins has to be 3.3V or bellow. This means I cannot put, imagine, 4.4V through an Analog Pin right?
Thanks for the help,
João Duarte
Correct.
That right. to read the signal, you will have to reduce it. You can use an operational amplifier for example.
That would fry it. There is a thing as noted by runaway_pancake called a voltage divider. I am assuming your calculator is in the other room so this link should do it for you. Voltage Divider Calculator You will probably use a 10K and a 5.1K resistor. Use the calculator and determine what is best for you. I have found that the A/D works best by keeping the A/D input impedance at 10K.
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