How to use PIC A/D converter with ACS712 Hall effect current sensor
This would be my first design using PIC A/D conversion, so, needing little else in the PIC I chose (one of?) the smallest that had a ten bit A/D converter (ADC), the PIC16F688, assuming that all ADC would be the same, and read in the data sheet that the negative voltage reference is always connected to the ground reference. Now I see that other PICs allow a second data pin to take on this role, so that will solve my problem, at the expense of a larger PIC. With the voltages in my comment to my question, I expect to use 1V as the negative reference on that pin to provide the offset I need. Perhaps I should apologise for taking up the space to ask such a naive question, sorry.