anchor.diff:  %% false
   %% '''
   %% In this case it was off.
  +- spec get(pin()) -> any().
   get(Pin) -> gen_server:call(?MODULE, {command, <<(index(Pin)):8, 2:8>>}).
   
  -%% @doc Sets the given pin to false
  +%% @doc Sets a pin to `false'.
   %%
   %% === Example ===
   %% Turn off the red led of `led_1' with:
  
positive.code: %% 1> grisp_gpio:clear(led1_r).
  %% <<>>
  %% '''
  clear(Pin) -> gen_server:call(?MODULE, {command, <<(index(Pin)):8, 3:8>>}).
  
  %% @doc Sets the given pin to true
  %%
  %% === Example ===
  %% Turn on the red led of `led_1' with:
  
negative.code: %% 3> grisp_gpio:set(led1_r).
  %% <<>>
  %% '''
  - spec set(pin()) -> any().
  set(Pin) -> gen_server:call(?MODULE, {command, <<(index(Pin)):8, 4:8>>}).
  
  
  