Q: What is the input range of the ADC? What is the educational value of the kits you presented.
A: The input range has a maximum of the supply voltage of the microcontroller. An MCU with a +3.3-volt power source cannot accept a voltage over 3.3 volts on any input, although MCU manufacturers include a bit of tolerance. The ADC range depends on the reference voltage, so read the data sheet for the MCU you plan to use. For a 2.500-volt reference, for example, you can digitize a signal between 0 and 2.500 volts. Some MCUs have an internal reference you can select, or you supply an external reference.
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