Light
You can see dusk arriving
Page 39 reads a BH1750 (I2C 0x23, or 0x5C with ADDR high): the illuminance sits in the middle with a five-step ambient level (dark / soft / moderate / bright / harsh), a scale bar below it, and the health score at the bottom.
β The bar is logarithmic, not linear. Human vision responds roughly logarithmically, and a linear bar barely moves between 50 and 1000 lx; on a log scale the slow dimming from afternoon to dusk is actually visible.
On-screen interface
A recreation of this page on the 2.41-inch AMOLED display (600 Γ 450). Actual interaction and layout follow the latest firmware.
Key capabilities
Direct lux
Lux value plus a five-step ambient level, no conversion needed.
Log scale
Changes from 50 lx to 5000 lx all remain visible.
Lighting advice
The screen states which level suits reading, office work or rest.
Health score
Missing, wrong ID, implausible readings and flaky contacts are reported separately.
Technical specs
Typical scenarios
Reading light
Dial a desk lamp to the "moderate" step instead of guessing.
Grow lighting
See whether the daily light curve is enough for plants.
Related commands
page 39 Open the light page lux Read illuminance once lux on | off Start or stop periodic sampling
- Do not point it at the sun; above full scale the reading simply pins at maximum.
- The log bar is for trends β trust the large number for absolute values.
- BH1750 responds to visible light, so IR or UV grow lamps read as darkness.