need circuit to convert + - 10v to 0-3.3v

[raman00084]

my load cell outputs +- 10v how can i convert to 0-3.3v for adc measurement i am using dspic 33ep family ic kindly help

 

[KlausST]

Hi

Similar question than a couple of days before...

Input is +/-10V ...in total 20V
Output is 0..3.3V ... in total 3.3V

20V : 3.3V = 6

So you have two options:
* either you first divide the input signal by 6 then add 1.65V
* or you first add 10 V and then divide it by 6.

Both can be made with a 4 resistir difference amplifier circuit.

Klaus

 

[BradtheRad]

Consider this method with two potentiometers.

You may find you need to connect the loose pot terminal to ground. Notice that makes 4 resistors as mentioned in the preceding post.