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

Tim,

The ANALOGIN produces a 8bit value, 0-255, that represents the full scale.
In case of the sx/b help file example, both resistors are equal and the
input range is 0-5v.

TrueVoltage = (Volt/255)*5v
Your measured 85 therefore represents (85/255)*5v = 1.66v


More generally, using Uinmin and Uinmax

TrueVoltage = Uinmin + (Volt/255)*(Uinmax-Uinmin)

Note that when you use this formula directly in sx/b you will
not have a result in decimals due to the integer division.
To have 2 decimals let TrueVoltage = 100 represent 1.00v
TrueVoltage = 100*Uinmin + (100*Volt/255)*(Uinmax-Uinmin)
Use words to do the math.

regards peter

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