Update specifications.md (#16)

Author: ClutchplateDude

assets/documents/specifications.md

@@ -24,32 +24,41 @@
 ## ALT/AZ
 - Must be able to slew by a given number of degrees
 - Must be able to slew at various rates until requested to stop
-- Should support slewing at various rates until requested to stop
+- Should support configurable min/max positions and limit axis movement accordingly
+- Should save home and current position to EEPROM
 
 ## Focuser
 - Must be able to slew at various rates until requested to stop
 - Must support slewing to a specific target position
+- Must be able to set motor position
 
 ## General
 - RA and DEC operations must be independent, but can overlap
 - Stepper operations must be async
 - Would be nice to get an event when the stepper stops
-- Serial message processing mst be sequential, but async and in the background
+- Serial message processing must be sequential, but async and in the background
 - Serial connection default speed should be 115200
 - Must be able to convert from RA/DEC coordinates to stepper target positions (must use solution with longest safe time)
 - Meade Protocol support for OAT/OAM/OAE
+- Should be able to return safe time left
+- Should be able to return time to meridian for current position
 
 ## Menu/Display
 - Support Info-only displays to show mount status
-- Support LCD?
-- Input devices? Buttons, joysticks, touch?
-- List of operations possible from interactive display devices
+- Support LCD screens (small, large, color, mono), but maybe start with common/standardized size
+- Should support input devices like Buttons, Joysticks, Dial with press point, Touch screen
+- Need to come up with a list of operations possible from interactive display devices
+  - Move any axes in any directions at various speeds
+  - Start/stop tracking
+  - Find home position 
+  - Go to Home position
+  - Enter target coordinates and slew there
 
 ## Sensors
 - Support for RA and DEC end switches
 - Support for RA/DEC homing switches
 - Temperature sensor?
 
 ## Improvements from 1.0
-- Support meridian flip? (how is this done when using camera in another app?)
+- Support meridian flip. This should already be supported in apps like NINA, if the sync to coordinate takes the longest safe time.
 - Dew heater support?