The DFRobot RS485 Photosynthetically Active Radiation (PAR) Sensor is a precision instrument designed to measure light within the 400–700nm spectral range, the range most critical to plant photosynthesis. Using advanced photoelectric sensing technology, the sensor provides accurate PAR readings expressed in μmol/m²•s, indicating the number of photons available for plant growth. With a durable aluminium alloy IP67-rated enclosure and a dust-resistant optical cover, it ensures reliability and stability even in harsh environments.

It features a cosine corrector to maintain measurement accuracy regardless of light incidence angles. The sensor communicates using the RS485 interface via the Modbus-RTU protocol and supports a wide 5–30V DC power input. Easy integration with Arduino using DF Robot RS485 modules makes it ideal for rapid deployment. Applications include crop growth monitoring, environmental research, and plant physiological studies. This sensor is a powerful tool for understanding and optimizing the light conditions that drive plant develop

Features :

1. DC 5~30V wide voltage power supply
2. Adopt high-precision photosensitive elements, high absorption in the full spectrum range
3. Equipped with a level and adjustment handwheel, convenient for on-site adjustment
4. Adopt RS485 interface, standard Modbus-RTU protocol
5. Adopt high-quality cosine corrector to ensure standard cosine response
6. Metal aluminium shell material, IP67 protection level

Package Includes:

1 x DFRobot RS485 Photosynthetically Active Radiation (PAR) Sensor (400-700nm)

1 x connector cable

1 x screw pack