Merge pull request #1 from smartrent/digit/raw_exposed

Expose raw readings in Measurement struct, allow passing compensation functions.

lib/sht4x.ex

@@ -76,6 +76,6 @@ defmodule SHT4X do
   @impl GenServer
   def handle_call({:measure, opts}, _from, state) do
     {:ok, data} = SHT4X.Comm.measure(state.transport, opts)
-    {:reply, {:ok, SHT4X.Measurement.from_raw(data)}, state}
+    {:reply, {:ok, SHT4X.Measurement.from_raw(data, opts)}, state}
   end
 end

lib/sht4x/measurement.ex

@@ -9,16 +9,23 @@ defmodule SHT4X.Measurement do
     field(:dew_point_c, number)
     field(:humidity_rh, number, enforce: true)
     field(:temperature_c, number, enforce: true)
+    field(:raw_reading_temperature, integer, enforce: true)
+    field(:raw_reading_humidity, integer, enforce: true)
     field(:timestamp_ms, integer, enforce: true)
   end
 
-  @spec from_raw(<<_::48>>) :: t()
-  def from_raw(<<raw_t::16, _crc1, raw_rh::16, _crc2>>) do
+  @spec from_raw(<<_::48>>, Keyword.t()) :: t()
+  def from_raw(<<raw_t::16, _crc1, raw_rh::16, _crc2>>, opts) do
+    compensation_func = Keyword.get(opts, :compensation_func, &Function.identity/1)
+
     __struct__(
       humidity_rh: humidity_rh_from_raw(raw_rh),
       temperature_c: temperature_c_from_raw(raw_t),
+      raw_reading_temperature: raw_t,
+      raw_reading_humidity: raw_rh,
       timestamp_ms: System.monotonic_time(:millisecond)
     )
+    |> compensation_func.()
     |> put_dew_point_c()
   end