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Arduino
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Basis Electronica
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Programming Arduino
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DCC++
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Arduino output pins

DCC++ BaseStation supports optional OUTPUT control of any unused Arduino Pins for custom purposes. Pins can be activited or de-activated. The default is to set ACTIVE pins HIGH and INACTIVE pins LOW. However, this default behavior can be inverted for any pin in which case ACTIVE=LOW and INACTIVE=HIGH.
Definitions and state (ACTIVE/INACTIVE) for pins are retained in EEPROM and restored on power-up.
The default is to set each defined pin to active or inactive according to its restored state. However, the default behavior can be modified so that any pin can be forced to be either active or inactive upon power-up regardless of its previous state before power-down.
To have DCC++ BaseStation utilize one or more Arduino pins as custom outputs, first define/edit/delete output definitions using the following variation of the "Z" command:

< Z ID PIN IFLAG >: Creates a new output ID, with specified PIN and IFLAG values.
 if output ID already exists, it is updated with specificed PIN and IFLAG.
 Note: output state will be immediately set to ACTIVE/INACTIVE and pin will be set to HIGH/LOW according to IFLAG value specifcied (see below).
 Returns: < O > if successful and < X > if unsuccessful (e.g. out of memory).
< Z ID >: Deletes definition of output ID
Returns: < O > if successful and < X > if unsuccessful (e.g. ID does not exist)
< Z >: Lists all defined output pins
 Returns: < Y ID PIN IFLAG STATE > for each defined output pin or < X > if no output pins defined.

D: The numeric ID (0-32767) of the output
(You pick the ID & They ares shared between Turnouts, Sensors and Outputs)
PIN: The Arduino pin number to use for the output.
STATE: The state of the output (0=INACTIVE / 1=ACTIVE)
IFLAG: Defines the operational behavior of the output based on bits 0, 1, and 2 as follows:

IFLAG, bit 0: 0 = forward operation (ACTIVE=HIGH / INACTIVE=LOW)
              1 = inverted operation (ACTIVE=LOW / INACTIVE=HIGH)

IFLAG, bit 1: 0 = state of pin restored on power-up to either ACTIVE or INACTIVE 
                  depending on state before power-down. 
              1 = state of pin set on power-up, or when first created,
                  to either ACTIVE of INACTIVE depending on IFLAG, bit 2

IFLAG, bit 2: 0 = state of pin set to INACTIVE uponm power-up or when first created
              1 = state of pin set to ACTIVE uponm power-up or when first created 

Once all outputs have been properly defined, use the < E > Upper Case E command to store their definitions to EEPROM.
If you later make edits/additions/deletions to the output definitions, you must invoke the < E > command if you want those new definitions updated in the EEPROM.
You can also ERASE everything (turnouts, sensors, and outputs) stored in the EEPROM by invoking the < e > (lower case e) command.
(There is no Un-Delete)
To change the state of outputs that have been defined use:

< Z ID STATE >: Sets output ID to either ACTIVE or INACTIVE state
Returns: < Y ID STATE >, or < X > if output ID does not exist
 ID: The numeric ID (0-32767) of the defined output to control
 STATE: The state of the output (0=INACTIVE / 1=ACTIVE)

When controlled as such, the Arduino updates and stores the direction of each output in EEPROM so that it is retained even without power. A list of the current states of each output in the form < Y ID STATE > is generated by DCC++ BaseStation whenever the < s > status command is invoked. This provides an efficient way of initializing the state of any outputs being monitored or controlled by a separate interface or GUI program.