Problem with Arduino and INA226 power meter module I am new to the use of Arduino in general, and to the INA226 Module for power metering.

I first got everything set up WITHOUT anything plugged to the INA226 module metering pins (V+, ISens+, Isens-, V- not connected to any power source) and running a sample code that gets data being read by the INA226, of course, all values return 0, but at least I know the program runs and the arduino can connect to the INA226. Now, the problem comes when I try to get some reading such as 5V or even 3.3V from the Arduino pins. 

I connected the circuit as follows:







simulate this circuit &ndash; Schematic created using CircuitLab

(I noticed that I wrote A6 instead of A4, sorry about that)

But when I do this, there is no reading at all from the serial console. I tried connecting the V+ and Isens+ directly to the 5V pin leaving everything else as shown in the diagram, but the Arduino board doesn't even turn on.

I tried referencing other sources, but their tests use external power supplies or other equipment I don't have.

I would be really thankful if someone could lend me a hand here or help me understand why am I having this problem and how can I make it read something basic such as 5V or 3.3V directly from the Arduino board.

Thanks!
There is a discrepancy in pin terminology between your schematic &amp; what TI uses in their datasheets. I don't see anything in their datasheets using I+ or I-. I only see V+ &amp; V-. These 2 pins perform all your voltage &amp; current measurements depending on the "mode" you tell the IC to use.

As near as I can tell based on your schematic, you should be seeing the voltage reading based on what is applied between V+ &amp; V- (In your case, 3.3vdc) if you've told the chip to read the bus voltage channel. 

You should also be getting a current reading between the V+ &amp; V- pins if you've told the chip to read the shunt voltage channel. Since the part is designed for a full scale voltage differential of 36v between the V+ &amp; V- pins, I suspect a reading of about 10% of max (based on a 3.3v differential).

I confess to not knowing the board or its operation but having looked it up on the TI website, it does appear to have a few jumper settings &amp; a calibration routine to follow. There's a user guide on TI's website as well as the usual technical data pages. Perhaps those will assist in setting the jumpers correctly. ina226 data sheet &amp; eval board user guide
bc