BH1750 Ambient Light Sensor

Digital 16-bit ambient light sensor over I2C. Used for automatic lighting control and daylight harvesting.

Sensor ROHM Semiconductor BH1750 optical i2c Draft

This entry is draft and has not been confirmed against physical hardware. A conforming tool will refuse to provision it. The datasheet is the authority, not this page.

Specifications

Protocol i2c
Sensor type optical
Manufacturer ROHM Semiconductor
Model number BH1750
Datasheet url https://www.mouser.com/datasheet/2/348/bh1750fvi-e-186247.pdf
Read interval seconds 60

Readings

SlugDevice classUnitRange
illuminance illuminance lx 0 to 65535

Wiring

PinRequiredNotes
sda Yes
scl Yes

Supply: 3.3V

Failure modes

  • Address is 0x23 with ADDR low and 0x5C with ADDR high. A floating ADDR pin gives an unstable address.
  • High resolution mode needs roughly 120ms per conversion. Reading sooner returns the previous sample.
  • Saturates in direct sunlight. Readings at the top of the range are not trustworthy without an attenuating window.

Entry

Keybh1750
StatusDraft
Revision1
Registry0.3.0
Datasheet Entry on GitHub JSON for agents

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