Bipolar to unipolar signals for ADC.

hello fellow tinkerers,

i create perfect circuit measure -10 till 10 volt on beaglebone black using arduino environment.

however know not possible read negative voltages.

the following receipy use measure bipolar signals unipolar , build it

input voltages , adc input voltages
-10v in 0,0v,
0v in 0.9v
10v in 1.8v.


i want make sure if doing right , kind opamps best kind of application?

and can connect negative voltage on inverting pin of opamp?


sincerely yours

b

this can done 3 resistors.

1) make two-resistor voltage divider fixed voltage (supply) ground, produces 0.9volt.
2) calculate resistance of 2 resisors in parallel.
3) add third resistor +10/-10 source tap drops 10volt 0.9volt.
leo..

Arduino Forum > Using Arduino > Sensors > Bipolar to unipolar signals for ADC.

arduino