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Small rectangular green circuit board with sensor chip and white Grove connector, plus a four-wire cable

Seeed Studio

Seeed Studio Grove Sunlight Sensor SI1151

SKU CH-VR9W-XK6SJ

Measures UV, visible and infrared light from 280 to 950 nm over I2C, running on 3.0 to 5.5 V at 3.5 mA

  • TypeSensors
  • Detects UV, visible and infrared light across 280-950nm spectrum
  • I2C interface with Grove connector enables plug-and-play integration
  • Low 3.5 mA current draw suits battery-powered microcontroller projects
  • Operates from 3.0 to 5.5 V across -45 to 85 °C range
  • Compact 140 x 85 x 11 mm board weighs just 9 g

UV-to-infrared light sensor

The Grove Sunlight Sensor SI1151 detects UV, visible and infrared light across a 280-950nm range using an I2C digital interface. It operates from 3.0 to 5.5V at 3.5mA, making it suitable for low-power microcontroller and single-board computer projects. The board measures 140mm by 85mm by 11mm and weighs 9g. It ships with a Grove cable for plug-and-play connection.

Upgrading from single-band detectors

This module replaces separate UV-index, ambient-light or IR-proximity sensors by combining all three measurements in one package. The jump is worth it when a project needs simultaneous spectral data — for example a weather station that logs UV risk alongside visible brightness — without wiring multiple breakout boards. It is not for designs that require calibrated radiometric power readings or spectral resolution beyond the broadband channels provided.

Integration into a Grove system

The sensor connects directly to any Grove-compatible port on an Arduino, Raspberry Pi HAT or compatible SBC, requiring no soldering or level-shifting. Its 3.3/5V supply range frees the builder from adding a dedicated regulator. The interrupt output can wake a sleeping MCU on light-threshold events, saving battery in remote loggers. Builders needing analog output or a non-I2C protocol must add external circuitry.

Highlights

  • Detects UV, visible and infrared light across 280-950nm spectrum
  • I2C interface with Grove connector enables plug-and-play integration
  • Low 3.5 mA current draw suits battery-powered microcontroller projects
  • Operates from 3.0 to 5.5 V across -45 to 85 °C range
  • Compact 140 x 85 x 11 mm board weighs just 9 g

Specifications

TypeSensors

Questions about this item

What board space does the 140 mm x 85 mm module need for mounting?

The board measures 140 mm by 85 mm and is 11 mm thick, so allow at least that footprint plus room for the Grove cable to exit.

How do I connect the sensor to an Arduino and what step is often missed?

Plug the included Grove cable into the onboard Grove connector and the matching port on your shield; the step often missed is ensuring the host runs at 3.0–5.5 V so the 3.5 mA supply current is met.

When will the UV/visible/IR detector need replacement or recalibration?

The SI1151 has no user-replaceable parts; it operates from -45 °C to 85 °C across the 280–950 nm range and is designed for continuous use without scheduled replacement.

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