Pros - Cons ? Obviously less components, but which is better, which would you use?With 2 resistors
+5V----[2K]----(analog_read_pin)-----[3K]-----(-5V to 0) Vss for testing
if Vss = 0V you should read 3V
if Vss = -5V you should read 1V
ratio for the value from 0 to -5v
I'd love to see a schematic of this?Why not feeding your ±Volts to the ADC via a diodes bridge. The output will be always positive, and you will make adjustment for the diodes drop with software.
Alberto
How about a voltage divider of two equal resistors, top tied to +5V, bottom to (0 to -5V), tap to the A/D input. Range at tap will be 0 to 2.5V....
Pros - Cons ? Obviously less components, but which is better, which would you use?