Measure pH, ORP, EC or salinity with an Arduino or Raspberry Pi

Photosynthetically Active Radiation Sensor

  • 400~700nm spectral range 🌈
  • ±5% accuracy
  • 0 - 2500 μmol/m²/s
  • I2C interface
  • 3.3 - 5 V voltage range

What it is

A PAR sensor in a waterproof aluminum enclosure with a 1.5m cable. The sensor comes pre-calibrated and doesn’t require any subsequent calibration.

The base has a 14” screw hole which can be used to mount the sensor on any standard tripod. It also comes with a small tripod and bubble level.

The device uses the Qwiic Connect System for wiring, it’s an easy-to-use, polarized, push-to-fit connector. No more mistaken connections or soldering header pins.

Using it

The documentation on the specification, and setup of the sensor is available.

The Arduino IDE, PlatformIO, and Particle.io library is in the respective library manager. Any Arduino compatible board will work. Any Raspberry Pi 3, 4 or Zero will work as well.

A python and rust library is available for the Raspberry Pi.

Arduino C++


Buying it

The PAR sensor, accompanying sensor circuit for taking measurements, and a tripod are included.

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Support, Documentation, and Questions

Sensor Circuit Datasheet

PAR Sensor Datasheet

If you have questions, find a bug, or have any suggestions, go to this project’s GitHub page and submit an Issue or Pull Request. Or you can send an email to [email protected].