Ina226 voltage and current sensor with esp8266 sending by MQTT

I needed to measure the voltage and the current of my lawn mower robot, as i have already an home automation system, the point was also to integrate these measures into Openhab and idealy using mqtt protocol.

The first idea that came up was to use a voltage divider to measure the voltage with the esp8266 analog pin.Nevertheless i found some contradictives infos about this, the accepted voltage was low between 1v and 2v depending on the sources. Unfortunately my battery is a 28,4v one.

With some search I found on banggood the ina226 sensor already soldered and ready to plug with an arduino. The question was; is this compatible with an esp8266 to allow an easy integration with my home automation system.
The answer is yes.

Thanks to the help of Shelvin blog here are the details:

Pinout for a NODEMCU:

Nodemcu/INA226

D1/SCL

D2/SDA

GND/GND

5V/VCC

IN+ & IN- correspond to the current meter for the tests, I linked them before the INA226 power so as to have some current measurements.

VBS is for voltage measurement for the tests I linked it to 3,3V of the nodemcu.

And now I'm able to publish the voltage, current and power from the ina226!

Here is the code:
https://github.com/1technophile/OpenMQTTCharger

Note that the INA226 library below doesn't compile currently on nodemcu (this library is not necessary with the code above)

https://github.com/jarzebski/Arduino-INA226

Note also that the code has now been integrated to OpenMQTTGateway!