bb_sensor_ina219

Beam Bots integration for the INA219 voltage / current / power monitor over I2C.

Polls the chip at a configurable rate and publishes BB.Message.Sensor.PowerState messages with bus voltage (V), current (A), power (W), and shunt voltage (V).

Usage

defmodule MyRobot do
  use BB

  topology do
    link :chassis do
      sensor :main_bus, {BB.Sensor.INA219,
        bus: "i2c-1",
        address: 0x40,
        calibration: :calibrate_32V_2A,
        publish_rate: ~u(10 hertz)
      }
    end
  end
end

Subscribe to readings:

BB.subscribe(MyRobot, [:sensor, :chassis, :main_bus])

See BB.Sensor.INA219 for full options.

Options

Option	Default	Description
`bus`	required	I2C bus name (e.g. `"i2c-1"`)
`address`	`0x40`	I2C address
`calibration`	`:calibrate_32V_2A`	One of three INA219 presets (see below)
`publish_rate`	`~u(1 hertz)`	Polling / publish rate

Calibration presets (all assume a 0.1Ω shunt — Adafruit breakout):

:calibrate_32V_2A — 32V bus range, ±2A current range
:calibrate_32V_1A — 32V bus range, ±1A current range
:calibrate_16V_400mA — 16V bus range, ±400mA current range