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JuiceBar
ActiveAn open-source Windows tray app that turns PC power use into electricity cost. It combines Windows 11 EMI and PawnIO-backed CPU sensing, NVML/ADL GPU readings, and ACPI battery measurements, while modeling the power and PSU losses sensors cannot see. Flat, tiered, and time-of-use tariffs plus taxes and fixed charges are validated from structured JSON and combined with local SQLite history.
C#.NET 10WPFWindows EMISQLiteLibreHardwareMonitorPawnIO
How it was solved
Problem
Windows has no API for whole-PC wall power, and hardware sensors expose only parts such as CPU and GPU. The user-facing question is the cost of the billing cycle, not just watts.
Decision
I separated measurable power from an unmeasured baseline B and PSU efficiency eta, with two-point external wattmeter calibration on desktops. Tariffs are also separated from calculation code behind a validated JSON schema.
Evidence
The app supports EMI, PawnIO, NVML/ADL, and ACPI paths and explicitly labels uncalibrated readings as not calibrated. Usage history stays in local SQLite with no account or server.
Result
The result connects measurement, estimation, tariffs, and billing-cycle cost in one tray app without hiding where direct measurement ends.