GrovePi

v0.6.1

GrovePi v0.6.1 GrovePi View Source

This application lets you interact with the GrovePi+ and any connected sensors in Elixir. It will automatically start with your application an initiate a connection to the GrovePi+ board.

To see that everything is functioning, check the firmware version on the board.

iex> GrovePi.Board.firmware_version()
"1.2.2"

If this doesn’t work, then nothing else will. If you’re running Raspbian, double check that I2C is enabled in raspi-config.

Link to this section Summary

Types

pin()

Functions

start(type, args)

Called when an application is started

Link to this section Types

Link to this section Functions

Link to this function start(type, args) View Source

Called when an application is started.

This function is called when an application is started using Application.start/2 (and functions on top of that, such as Application.ensure_started/2). This function should start the top-level process of the application (which should be the top supervisor of the application’s supervision tree if the application follows the OTP design principles around supervision).

start_type defines how the application is started:

  • :normal - used if the startup is a normal startup or if the application is distributed and is started on the current node because of a failover from another node and the application specification key :start_phases is :undefined.
  • {:takeover, node} - used if the application is distributed and is started on the current node because of a failover on the node node.
  • {:failover, node} - used if the application is distributed and is started on the current node because of a failover on node node, and the application specification key :start_phases is not :undefined.

start_args are the arguments passed to the application in the :mod specification key (e.g., mod: {MyApp, [:my_args]}).

This function should either return {:ok, pid} or {:ok, pid, state} if startup is successful. pid should be the PID of the top supervisor. state can be an arbitrary term, and if omitted will default to []; if the application is later stopped, state is passed to the stop/1 callback (see the documentation for the c:stop/1 callback for more information).

use Application provides no default implementation for the start/2 callback.

Callback implementation for Application.start/2.