In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

You won't get linear results if you are not using the same value resistors.

You will need to use an op-amp to buffer the voltage (you may be able to use the SX comparitor, I never tried it).

Basically you want to run your 35volts through a resistor divided to get it down to 5 volts. Then run that 5 volts through an op-amp to buffer the voltage level. Then run the output of the op-amp into the analogin circuit using the same value resistors on each side.

Bean.

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