Power management daemon for AsteroidOS. Gives you profile-based control over sensors, radios, and system settings on your watch.

asteroid-powerd is a system daemon that manages power on AsteroidOS watches. Instead of just having one "battery saver" toggle, you get multiple profiles that are each tuned for a specific situation (indoor, outdoor, health tracking, workouts, etc). Each profile has its own config for every sensor, radio, and system setting on the watch. The daemon can also switch profiles automatically based on battery level or time of day.

Everything is exposed over D-Bus (org.asteroidos.powerd) so any UI can talk to it. The settings UI lives in asteroid-settings.

• 8 built-in profiles for common use cases (see Profiles)
• Custom profiles with per-sensor, per-radio control
• Automation: auto-switch on battery thresholds or time-of-day
• Workout mode: quick profile switching for treadmill, running, cycling, hiking
• Battery telemetry: history ring buffer, drain rate, time-remaining prediction
• Two sensor backends: SensorFW (D-Bus) with sysfs fallback
• Radio control for BLE, Wi-Fi, LTE, NFC with sync scheduling
• System settings: always-on display, tilt-to-wake, background sync (via MCE/ConnMan)
• D-Bus API with 14 methods and 5 signals (see D-Bus Interface)
• Systemd service with D-Bus activation
• 60 language translation templates
• 6 unit test programs

The daemon manages 9 sensors. Each one has multiple operating modes that control sampling rate and power draw.

These share the same set of modes:

So for example, the "Health Indoor" profile runs accelerometer at medium (25 Hz for gesture detection) and gyroscope at low (5 Hz, just for basic orientation). That's enough for step counting without burning through the battery like workout mode would.

In the settings app, each sensor and radio shows up as a row with a vertical green bar on the right. It's a multi-state toggle: tap the row to cycle through modes.

 ┌─────────────────────────────┬───┐
 │ Accelerometer          Low  │▐  │  <- 25% filled (green from bottom)
 ├─────────────────────────────┼───┤
 │ Gyroscope              Off  │▐  │  <- 0% filled (all grey)
 ├─────────────────────────────┼───┤
 │ Heart Rate             High │▐  │  <- 75% filled
 ├─────────────────────────────┼───┤
 │ GPS              Continuous │▐  │  <- 100% filled (all green)
 └─────────────────────────────┴───┘

The fill height maps to where the mode sits in the list:

• 0% (grey) = Off
• 25% = Low
• 50% = Medium
• 75% = High
• 100% (green) = Workout / Continuous / Always

For simple on/off toggles like BLE or NFC, the bar is just fully grey or fully green. You can glance at the whole profile and immediately see which sensors are cranked up and which are off.

Four radios, each with independent power state and sync scheduling:

• State: Off / On
• Sync mode: Manual, Interval (1h to 24h), or Time Window
• Can optionally turn off during sleep

• State: Off / On
• Sync mode: Manual, Interval, or Time Window
• Optional sleep disable

• State: Off / Calls Only / Always
• "Calls Only" keeps the radio in low-power standby, only waking for incoming calls

• State: Off / On

Applied through MCE (Mode Control Entity) and ConnMan D-Bus interfaces.

Switch profiles automatically when battery drops below a level:

{
  "threshold": 20,
  "switch_to_profile": "ultra_saver_indoor"
}

When battery hits 20%, it switches to Ultra Saver to stretch the remaining charge.

Schedule profile switches by time of day:

{
  "start": "23:00",
  "end": "07:00",
  "switch_to_profile": "ultra_saver_indoor"
}

Go into Ultra Saver overnight, switch back in the morning.

Map workout types to profiles so you can switch with one tap:

{
  "treadmill": "health_indoor",
  "outdoor_run": "health_outdoor",
  "cycling": "performance_outdoor",
  "hiking": "health_outdoor"
}

Service: org.asteroidos.powerd Object: /org/asteroidos/powerd Interface: org.asteroidos.powerd.ProfileManager

• Qt 5.12+ (Core, DBus, Test)
• CMake 3.10+
• Systemd (for service install)

mkdir build && cd build
cmake ..
make

cd build
ctest --output-on-failure

make install
systemctl enable asteroid-powerd
systemctl start asteroid-powerd

Or through the AsteroidOS Yocto build system:

source oe-core/oe-init-build-env build
bitbake asteroid-powerd

┌──────────────────────────────────────────────┐
│              D-Bus Interface                 │
│    org.asteroidos.powerd.ProfileManager      │
└────────────────────┬─────────────────────────┘
                     │
         ┌───────────┴───────────┐
         │    Profile Manager    │
         │  (JSON load/save)     │
         └───────────┬───────────┘
                     │
    ┌────────────────┼────────────────┐
    │                │                │
┌───┴───┐    ┌──────┴──────┐   ┌─────┴─────┐
│Sensor │    │   Radio     │   │  System   │
│Control│    │  Controller │   │ Controller│
└───┬───┘    └──────┬──────┘   └─────┬─────┘
    │               │                │
┌───┴───┐    ┌──────┴──────┐   ┌─────┴─────┐
│SensorFW│   │BlueZ/ConnMan│   │    MCE     │
│ sysfs  │   │  D-Bus      │   │   D-Bus    │
└────────┘   └─────────────┘   └───────────┘
                     │
         ┌───────────┴───────────┐
         │  Automation Engine    │
         │ (battery/time rules)  │
         └───────────┬───────────┘
                     │
         ┌───────────┴───────────┐
         │   Battery Monitor     │
         │ (ring buffer, predict)│
         └───────────────────────┘

This is a first version. It works but there are things to fix:

• SensorFW race condition: The availableSensors() D-Bus call is async, so the sensor list might be empty on first check. Falls back to sysfs which works fine in practice.
• Workout state sync: The workout active/inactive state between DBusInterface and AutomationEngine can get out of sync in edge cases.
• GPS timer lifecycle: The periodic GPS timer doesn't get cleanly stopped in all code paths.
• Screen-on detection: screenOn state isn't wired up yet.
• TimeWindow sync mode: Only fires once instead of repeating.

GPLv3. See LICENSE.

This is early days. Issues and PRs welcome.

If you're from the AsteroidOS project and want to bring this repo into the org, let us know. We'd be happy to transfer it.