===== 40 Inch Filter Wheel =====

The 40 inch filter wheel is 6 slotted filter wheel, controlled over the network through NG protocal. It uses a stepper motor for motion and a hall effect sensor and encoder for homing and positioning respectively. It is controlled by an Arduino Ethernet and a LIN Engineering stepper driver. 


==== Network Control ====

The wheel uses [[NG Protocol]] developed by Steward Observatory. Its observatory ID is CSS40 and its SYSid is FW40. Each command or request requires a trailing newline. 




=== Request List ===

^ NAME     ^ # of ARGS ^ DESCRIPTION              ^
| FNUM     |  0        | Returns the current filter wheel number |
| MOT      |  0        | Returns the motion status               |




=== Command List ===
^ Name    ^ # of Args   ^ Description  ^
| GOTO    | 1 (fnumber) | Sends the filter wheel to the given number |
| DISABLE | 0           | Disables the stepper motor |
| ENABLE  | 0           | Enables the stepper motor  |
| SETHOME | 1 (Home Pos)| Sets the home position in offset counts first detecting the home sensor.     |
| SAVEHOME| 1 (Home Pos)| Saves the given home position to the eeprom so it will use this value on start up. This will permanently change the home position!!! Use at your own peril!!! |
| HOME    | 0           | Moves to the home positon. |
| STOP    | 0           | Stops all motion           |

=== Source Code ===

You can find the arduino source code and an example python program for the network communication [[ http://github.com/srswinde/fw40 | here ]].