Passive Mode Voltage Input Part 1
Watch polarity!
This circuit makes sure it is always OK
0V = 226 & 4.5V = 1023
.SetVar 1, 9, 0 'x1=input
.SubVar 1, 2, 226 'x1=x1-226
.MulVar 1, 2, 26 'x1=x1*26
.DivVar 1, 2, 5 'x1=x1/5
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