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:
-
Add hmc5883l to your list of dependencies in
mix.exs:elixir def deps do [{:hmc5883l, "~> 0.5.0"}] end -
Ensure hmc5883l is started before your application:
```elixir
def application do
[applications: [:hmc5883l]]
end
```