![]() In the case of an Arduino, we can assume it's in the range of 10 kiloohms to 100 kiloohms, depending on things such as the sampling rate. Different types of input will load what they're measuring to different extents this is where Radc comes in: it's a representation of the load that the ADC puts on the circuit, not a physical, discrete component. Our equations above assume that the ADC doesn't put any load on the resistor divider, but that's not correct.
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