Sensors status
Current sample values for a handful of household sensors, refreshed from a same-origin JSON file.
Home lab field notes
Small measurements, kept useful.
Metrion is a compact record of sensor tests, ESP32 experiments, power measurements, and monitoring work around a small home laboratory. Notes are written for repeatability rather than presentation.
Latest notes
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SHT41 calibration against a simple reference setupOffset checks, chamber improvised from household parts, and what was worth correcting.
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ESP32 deep-sleep power: measuring the parts that still consumeBoard-level current measurements, regulator losses, and wake-up intervals.
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Exporting home sensor metrics to PrometheusA deliberately small text endpoint and a few rules for metric names.
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Long I²C lines: slowing down before adding hardwareCable layout, pull-ups, bus frequency, and error counts from a noisy run.
Scope
The project stays intentionally narrow: measurements, wiring decisions, firmware fragments, and enough context to reproduce a result months later.