how do I get negative input and how do I detect difference between the data as it changes constantly.
Are you trying to measure an analog voltage (using an ADC) and have a negative input?
If so, a bridge rectifier can be used (and then there will be the diode volt drop to take into consideration, although this can be reduced with Schottky diodes). There are other ways to eliminate the drop, aka 'precision rectifier' which is a more complicated circuit.
If the data is changing, then this can be normal with an ADC - you could take an average (if this is a valid assumption for the type of signal expected on the input).
how do I get negative input and how do I detect difference between the data as it changes constantly.
Are you trying to measure an analog voltage (using an ADC) and have a negative input?
If so, a bridge rectifier can be used (and then there will be the diode volt drop to take into consideration, although this can be reduced with Schottky diodes). There are other ways to eliminate the drop, aka 'precision rectifier' which is a more complicated circuit.
If the data is changing, then this can be normal with an ADC - you could take an average (if this is a valid assumption for the type of signal expected on the input).
