You may not but the manufacturer certainly does. That is why there are limitations on input voltages.
The ADS1115 is an absolute ADC, with its own internal reference.
The potential on that output pin will range from -5V to +5V according to the current (-300A min, +300A max).
That is a 10V swing, which cannot be measured by the ADS1115 anyway.
A summing amplifier will actually require a -Vcc rail, right?
Maybe easier to just use Arduino's ratiometric A/D. 10k resistor between sensor output and analogue input, and 10k resistor between analogue input and 5volt. That will give a 0-current value of about 512, with a deviation from that for positive and negative currents.Next time buy a current sensor with unipolar output, like 4-20mA.
And yes... I guess I could try to use the Arduinos own ADC. I'll lose a lot of my resolution but I'll have a look at it.
Hey there!I have a voltage divider which is supposed to function as a crude input protection for an ADC (differential reading). I am familiar in calculating basic voltage dividers and this basically is just that, but somehow I am stuck now.The ADC will see 0.24 volt since that is the differential voltage between the points A and B. But I am struggling to find the right equation to calculate the actual input voltage.