Learn MicroPython #5 - Measuring sensor voltages (ADC)

Full code available on Github!
github.com/invent-box/Learn-M...
In a previous video we learned how to use a pin as a digital input in order to read the value of a button. In this video, we will explore a feature built in to most microcontrollers that is able to measure the value of a voltage. It is called and analog to digital converter.
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[@MrOlkaz]

Really enjoying your videos - one comment for other viewers - not having enough ADCs doesn't mean you're "out of luck". It just means it's time to throw in a multiplexer, which is trivial to implement and cheap. Thanks again!

[@MEzeroTM]

This is exactly the content I need in my life right now!

[@kurtfattig9370]

Great job, Darius. Thanks for doing these videos. I learned just what I needed to get a project going.

[@tensionw3349]

Help me a lot. Hoping for next vedio.

[@schogaia]

Very good video, thank you!
I still have one question:
What is the voltage devider used for?
There shouldn't be a significant amount of current flowing while reading the adc, should it?

[@ZayMeisters]

What would you suggest I do to map the count to a longet period? For example, I have a linear actuator with a built in potentiometer and I want the ADC to read 4095 when it is fully extended and 0 when it is all the way in. However the ADC will read 4095 wayyy before the linear actuator is fully extended. I want to delay the increment of the ADC reference voltage in order to map it to the length of time it would take to have the linear actuator fully extennd. Any thoughts on this?