Differences

This shows you the differences between two versions of the page.

--- dome_control [2024/01/17 16:09] – created holtz
+++ dome_control [2024/02/10 19:43] (current) – holtz
@@ Line 2: / Line 2: @@
 Dome control is implemented through software running on a Raspberry Pi. Initial implementation controls dome motors through the Autoscope box with Opto 22 relays, but goal would be to just control the dome relays directly. The Raspberry Pi has a RELAYPlates card with 7 relays, which control shutter direction, shutter power, dome direction, dome power, and watchdog reset. These relays connect the control lines to ground.
+On Autoscope box, there two four pin connectors at the top that get power (+24VDC and ground) and signal and ground for dome rotation power and direction.
+There is a 9 pin connector that gets signal and ground for shutter power and direction. The relays for
+these in the Autoscope box get power from the two four pin connectors.
+Finally there is a 4 pin connector that gets +24VDC and ground from the watchdog. If there is no voltage, then the dome closes.
 The dome encoder gets +5V and ground from the RPi, and receives 5VDC signals from the A and B phases of the quadrature encoder. These are wired into RPi GPIO ports through a level converter that converts 5V to 3.3V.
+DC +5 and ground are connected to RPi power, A and B outputs are connected to level shifter input channels; level shifter output channels are connected to RPi GPIO pins.
+| Encoder pin | function | wire color | D connector pin | D connector color | connect | level shifter wire color |
+| 1 | +5VDC | red | 2 | red | RPi +5V   | |
+| 2 | gnd   | org | 8 | wht | RPi Gnd | |
+| 3 | Bbar  | brn | 3 | org |  | |
+| 4 | B     | blk | 7 | vio |  level B2 | grn |
+| 5 | Zbar  | grn | 5 | grn |  | |
+| 6 | Z     | vio | 9 | wht(outer) |  | |
+| 7 | Abar  | blu | 1 | brn |  | |
+| 8 | A     | yel | 6 | blu |  level B1 | blu |
-The home sensor gets +5VDC and ground from the RPi, and receives a signal on a GPIO port that is normally low, but goes high when the home magnet is in proximity to the sensor.
+The home sensor gets +5VDC and ground from the RPi, and receives a signal on a GPIO port that is normally low, but goes high when the home magnet is in proximity to the sensor.S
+| Sensor wire | function | circular connector pin | color | level shifter | color|
+|     |        | 1 | wht | | |
+| red | gnd    | 2 | blk | RPi gnd | |
+| blk | signal | 3 | brn | level B3 | gry |
+| grn | +DC    | 4 | red | RPi +5V | |
 Low-level functions are implemented in the APOAshDome.py module. An ASCOM Alpaca interface was implemented using the templates from the [[https://github.com/ASCOMInitiative/AlpycaDevice|AlpycaDevice]] package.
-Software is archived on [[https://github.com/holtzmanjon/APOAshDome|github]]
+Software is archived at [[https://github.com/holtzmanjon/APOAshDome]]