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July 2024

Cedar-server version: 0.1.0

Initial public release.

August 28 2024

Cedar-server version: 0.2.0

Major updates:

  • Expand saved preferences to cover more items, such as observer location.

  • Fix "white flash" that occurs when slewing.

  • Improve SkySafari integration:

    • Enable "Sync" feature
    • Accept observer geolocation information

September 7 2024

Cedar-server version: 0.3.0

Major updates:

  • New "daylight" alignment mode. During the day, point the telescope at a distant landmark, tap Cedar's new "zoom" button, and then tap on the screen to tell Cedar what the telescope is aimed at.

  • Basic vs. advanced functionality.

  • Removed exposure time control. This is now entirely automatic.

  • Text size setting.

  • Improved night vision theme. Deeper reds, darker panel backgrounds.

  • Replaced slider for showing number of detected stars with a circular gauge. Tapping the gauge brings up performance stats.

  • In setup screen, added enable/disable for focus aids.

September 21 2024

Cedar-server version: 0.4.0

Major updates:

  • 'About' screen giving information about Cedar server and calibration results.

  • Minor UI improvements such as better tap target sizes.

  • UI alert for lack of server connectivity or lack of detected camera.

  • Improved menu item styling.

  • Listen on port 80 (and also 8080 as before).

  • "Demo mode" allowing selectable image files to be used instead of camera.

  • Use a "run" directory instead of "src" directory.

  • Use Raspberry Pi activity LED to convey Cedar status.

    • blinking: waiting for client to connect
    • off: client is connected

    When Cedar is not running, the activity LED reverts to reflecting SD card activity

  • Add restart option in addition to shutdown.

October 12 2024

Cedar-server version: 0.5.0

  • Add preference for inverting camera image (rotate 180degrees).

  • Fix exposure calibration logic bug.

  • Telescope boresight no longer restricted to central third of image.

  • Redesign setup mode: focus, then align. Focus and align have on-screen prompts; align highlights 3 brightest detections.

  • Daylight mode is now applicable to focus as well as align.

  • Remove speed/accuracy slider.

  • Fix push-to directions layout problems.

November 15 2024

Cedar-server version: 0.6.0

  • Improve server and network reliability.

  • Adjust camera gain in daytime focus and align modes.

  • Fix bug leading to very long calibration delays.

  • Change to rolling logs.

November 17 2024

Cedar-server version: 0.6.1

  • Bug fixes.

December 15 2024

Cedar-server version: 0.7.0

  • Preference for left vs right handed control placement.

  • Compact layout for sky location display.

    • Can tap to bring up comprehensive information.
    • Can designate preferred display: ra/dec vs alt/az

  • Add preference for screen always on (app only).

  • In Setup alignment mode, rotate displayed image to orient zenith up.

  • Pinch zoom to change text size.

  • Eliminate network-releated hangs (hopefully) trying to fetch fonts.

  • Add star count and image noise to performance popup.

  • Fix missing alt/az vs. equatorial mount in preferences.

January 7 2025

Cedar-server version: 0.8.0

  • Fix bugs in calibration cancellation logic.

  • Remove camera temperature attribute.

  • Fix bug in Rpi camera logic regarding discarding images after setting change.

  • In align screen, ensure that bright star is highlighted as alignment target even if it is so overexposed that it is not detected as a star.

  • Fix bug where activity light would blink when Cedar Aim is inactive because user is interacting instead with SkySafari.

  • Reduce geolocation map resolution.

January 13 2025

Cedar-server version: 0.8.1

  • Fix bug that was hiding geolocation button.

  • Update camera logic for Rpi5 compressed raw.

February 15 2025

Cedar-server version: 0.9.0

  • Fixes for high resolution camera modules such as the RPi HQ camera:

    • When downsampling image for display on phone, preserve star brightness.
    • Fix hit testing in alignment screen to make it easier to select alignment star.
    • Adjust size of focus assist inset image.

  • Improve threading and locking.

  • Fix bugs causing 100% CPU usage even when updating at low frequency.

  • Fix TelescopePosition implementation to avoid "split updates" in SkySafari, eliminating occasional spurious position jumps.

  • When calibrating plate solver, use longer exposure to get more stars for improved FOV/distortion estimates.

  • Goto mode:

    • Show "Re-align" button only when close to target.
    • Adjust slew directions text block placement.
    • Add small icons for up/down and clockwise/counterclockwise.

  • Reorganize Rust package structure under cedar-server component.

  • Refactor Tetra3 dependency.

    • Move subprocess management into tetra3_server directory.
    • Implement new SolverTrait to use Tetra3 (Cedar-solve).
    • Update protobuf types so that Cedar does not directly depend on Tetra3 protobuf types.

February 20 2025

Cedar-server version: 0.9.1

  • Fixes bug where plate solve failures could cause SkySafari to stop getting updates until Cedar Aim app is resumed.

  • Increases maximum exposure time for color cameras to 2 seconds.

May 26 2025

Cedar-server version: 0.9.3

  • Update plate solver match_threshold to 1e-5, reducing the chance of a false solution.

  • Fix hanging behavior in solver.

  • Improve auto-exposure algorithms.

  • Always rotate image to zenith up when not in focus or daytime align mode.

  • If calibration fails, stay in current mode (focus or daytime align).

  • Other calibration fixes.

  • Add interstitial explanation screens for startup, focus, and align.

  • Broaden target tap tolerance in align mode.

  • Increase text sizes, tweak layouts.

  • Improve formatting of push-to directions.

June 23 2025

Cedar-server version: 0.10.0

  • Add more information screens.

  • Add "don't show again" checkbox on information screens.

  • When changing camera parameters, continue to process images that don't yet reflect the parameter change.

  • Tweak hot pixel detection logic.

  • Auto exposure improvements.

  • Update calibration and auto exposure logic to not raise exposure too high when trying to increase star count. This might fix reported "white out" problems.

  • Fix occasional hang on calibration failure.

July 1 2025

Cedar-server version: 0.11.0

  • Display central square crop of camera image instead of full camera image.

  • Adjust app layout to take advantage of larger data/control panels around square image.

  • In about screen camera information, reflect when demo image is being used.

  • Don't hold camera lock when waiting for next exposure to be ready; this was causing UI responsiveness problems.

  • Clean up other locking issues.

  • Once LED turns off (when app connects), don't turn LED back on (e.g. when app goes to sleep due to screen off etc.).

  • Make FOV bullseye more visible in daylight align mode.

  • Add haptic feedback in align mode and for re-align.

August 2 2025

Cedar-server version: 0.12.2

  • Update/fix auto-exposure logic.

  • Update/fix exposure calibration logic.

  • Star count gauge displays moving average rather than instantaneous value.

  • Fix daylight mode auto-exposure.

  • On exposure calibration failure, UI pops a message identifying reason: Too few stars due to lens cap being covered; sky too bright.

  • Improved twilight tolerance.

November 25 2025

Cedar-server version: 0.16.0

  • Reorganize "don't show" preference items.

  • Allow perf gauge display item to be chosen.

  • Daylight focus zoom image.

  • Improve server mutex and async logic.

  • Improve About screen organization.

  • Remove update rate slider (always runs at full speed).

  • Draw slew directions in data area instead of overlayed on main image.

  • Fix determination of whether slew target is in view.

  • Long press on shutdown confirmation clears observer location.

  • Fix full screen layout on Pixel phone.

  • Layout tweaks for iOS.

December 15 2025

  • Improve focus screen prompts.

  • Improve alignment screen prompts.

  • Popup feedback when user taps on align target.

Plus contributions from a member of the Cedar user community:

  • Support LX200 protocol for SkySafari 6 and 7 and Stellarium.

  • Support Bluetooth for SkySafari to connect to Cedar server.

December 22 2025

  • LX200 fixes and improvements.

  • Bluetooth fixes and improvements.

February 20 2026

Cedar-server version: 0.18.0

  • Cedar always starts Bluetooth server for SkySafari/Stellarium, don't need to enable.

  • Cedar always starts Bluetooth server for Cedar Aim app (Android only; not web app), don't need to enable.

  • Make Cedar's Bluetooth device name same as WiFi access point name.

  • Provide controls for skipping focus and/or align steps (and restoring them).

  • Enable Bluetooth pairing to Cedar at startup; auto-disable after receiving get_frame RPC. Provide control to enable/disable pairing with option to keep pairing on.

  • Fix bug in determining whether slew target is on-screen.

  • Fix jank when first displaying slew target.

  • Fix WiFi access point security configuration; fixes problems with Samsung devices not connecting and iOS warning about insecure connection.

  • Picture-in-picture mode for Cedar Aim app (not Web app version).

  • Reorganized connection loss/recovery dialog.