This is an OTP application for reading the HMC5883L magnetic compass. It utilizes elixir_ale for configuring and reading the compass over i2c bus.

• HMC5883L: OTP Application, supervises HMC5883L.State & HMC5883L.Supervisor. Also exposes public API

  • start/2: starts application

• Event Manager:

  • {:raw_reading, {x,y,z}} - raised with raw x, y, z axis reading from i2c bus
  • {:scaled_reading, {x,y,z}} - raised with scaled x, y, z axis reading from i2c bus. scale is based on current gain setting
  • {:heading, decoded_heading} - raised when heading is decoded from a scaled reading
  • {:available, boolean_availibity} - raised with true when HMC5883L.Driver is successfully initialized, raised with false when HMC5883L.Driver terminates

  Event manager is registered with a named based on the configured sensor name, following the template :hmc5883l_[name]_evtmgr.

config :hmc5883l, sensors: [
	%{
		name: "ch1",
		i2c: "i2c-1",
		config: %{
			gain: 1.3,
  		mode: :continuous,
  		bias: :normal,
  		data_rate: 15,
  		averaging: 8
		}
	}
]

name : used to identify the sensor and name processes i2c : name of the i2c bus to connect to the sensor on config : compass configuration values. See HMC5883L.CompassConfiguration for more information

Available in Hex, the package can be installed as:

1. Add hmc5883l to your list of dependencies in mix.exs: elixir def deps do [{:hmc5883l, "~> 0.5.0"}] end

2. Ensure hmc5883l is started before your application:

```elixir  
    def application do
      [applications: [:hmc5883l]]
    end
```