The ezeio inputs are designed for monitoring voltages up to 10V. The inputs are protected, so higher voltages (up to 100V) will not cause any damage, but the scale stops at 10V, and anything higher will show as 10V.
To widen the range of an input, simply add a series resistor.
The internal resistance of the ezeio input is 95kOhm. By adding a 390kOhm resistor in series, the input will be scaled to accept up to 51V.
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