Interesting questions from Sandro. Gives me an idea for a video (how Multimeters work.)
... I would like to ask your help regarding explaining more about voltage regulator in systems where the "input V" is dynamic.
I am trying to learn electronics and just bought an arduino.
I was thinking on how can I make an voltmeter.
Voltmeters use voltage dividers. Here's a simplified view: The meter is measuring across an enormous resistor. When you change ranges on the meter, you are changing a series resistor that changes the maximum divider ratio. That way by changing the R2 and R1 ratio you change the maximum voltage the multimeter can measure.
With this I am trying to learn on how to implement the following analog to digital in the Arduino but overcoming the limitation of the 10 bit resolution ( from 0 to 1023 ) without having higher bits like 16bit or more.
The best way to "overcome" the 10-bit "limitation" is to use a higher resolution A/D. Most A/D support SPI making them relatively easy to use with an Arduino.
So, I was thinking if it would be possible increase the resolution by having for example 5 systems, where each one of then would be a voltage divider in the way to each one would "read" a voltage interval.
Circuit 1: would only read from 0 to 1V
Circuit 2: would only read from 1 to 2V
Circuit 3: would only read from 2 to 3V
Circuit 4: would only read from 3 to 4V
Circuit 5: would only read from 4 to 5V
I don't know how you would isolate DC-coupled voltages in this manner. I could see you building towards a very complex interleaving system. Instead, I would look at a higher resolution A/D.