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# Example for `ina219` driver

An example to use `ina219`.

## What it does

It configures and calibrates `ina219`.

It shows bus voltage, shunt voltage, current thorough the bus, power thorough
the bus in a loop.

## Wiring

Connect `SCL` and `SDA` pins to the following pins with appropriate pull-up
resistors.

| Name | Description | Defaults |
|------|-------------|----------|
| `CONFIG_EXAMPLE_I2C_MASTER_SCL` | GPIO number for `SCL` | "5" for `esp8266`, "6" for `esp32c3`, "19" for `esp32`, `esp32s2`, and `esp32s3` |
| `CONFIG_EXAMPLE_I2C_MASTER_SDA` | GPIO number for `SDA` | "4" for `esp8266`, "5" for `esp32c3`, "18" for `esp32`, `esp32s2`, and `esp32s3` |

## Notes

The example assumes that expected max current is 5 A, and the shunt resistor
is 100 milliohm. The defaults can be modified under `Example configuration`
in `menuconfig`.

Care should be taken when you measure high current (more than 1 A).
Breadboard is not designed for high current.

`CONFIG_NEWLIB_LIBRARY_LEVEL_NORMAL` must be `y` on `esp8266`.