> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# RS485 Photosynthetically Active Radiation (PAR) Sensor (400-700nm)

**Type:** Product page · **SKU:** SEN0641 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/rs485-par-sensor-photosynthetically-active-radiation-arduino.html ([markdown](https://core-electronics.com.au/rs485-par-sensor-photosynthetically-active-radiation-arduino.html.md))

IP67-rated PAR sensor measures 400-700nm light for crop growth & solar systems. Modbus-RTU/RS485 interface, 5-30V DC. Arduino-compatible...

## Pricing

- **Price:** $109.95 (inc GST) — $99.95 AUD, exc GST
- **Quantity discounts:** 6+ $94.95 (exc GST) · 12+ $90.95 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 21 and Aug 25.

## How to buy

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- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

The RS485 Photosynthetically Active Radiation (PAR) Sensor is designed to measure the amount of light that plants can utilize during photosynthesis. It operates within the **spectral range of 400-700nm**, which corresponds to the light needed for plant growth. The sensor converts sunlight into a voltage signal that is directly proportional to the intensity of the incident radiation, with sensitivity that follows the cosine of the light's angle of incidence. This high-precision sensor is equipped with a specially treated dust cover to prevent environmental interference, ensuring reliable measurements. The sensor supports Modbus-RTU communication via RS485 and operates with a wide DC voltage range of 5-30V, making it compatible with various platforms like [Arduino.](https://www.dfrobot.com/topic-277.html)

**Wide Voltage Range and Easy Integration**

The sensor operates with a DC power supply from 5-30V, offering flexibility for integration into diverse systems. It supports RS485 communication using the standard Modbus-RTU protocol, making it simple to interface with Arduino and similar platforms for data collection.

**High Precision and Reliability**

The sensor features high-precision photoelectric elements with wide spectrum absorption, ensuring accurate measurements of photosynthetically active radiation (PAR) in the 400-700nm range. Additionally, the sensor's cosine corrector guarantees an accurate response to varying light angles, essential for precise environmental monitoring.

**Durable and Weather-Resistant**

Constructed with a metal aluminum shell and rated IP67 for protection against dust and water, the sensor is highly durable and suitable for use in harsh outdoor environments. The specially treated dust cover ensures long-term stability by minimizing the effects of environmental contamination.

![RS485 PAR sensor measures photosynthetically active radiation (PAR) for plant photosynthesis.](https://core-electronics.com.au/attachments/localcontent/1_0x0_375561c4f7d.webp)

RS485 PAR sensor measures photosynthetically active radiation (PAR) for plant photosynthesis.

### Specification

11. Power Supply: DC 5-30V
12. Working Current: <10mA
13. Output Mode: RS485
14. Measurement Range: 0-2500 µmol/m²·s
15. Wavelength Range: 400-700nm
16. Accuracy: ±5% (1000 µmol/m²·s @ 550nm, 60%RH, 25°C)
17. Resolution: 1 µmol/m²·s
18. Response Time: 10 µs
19. Non-Linearity: <±1%
20. Annual Stability: =±2%
21. Cosine Response: =±10%
22. Operating Temperature: -25°C to +60°C
23. Protection Level: IP67
24. Sensor Cable Length: 20cm
25. Adapter Cable Length: 70cm
### Documents

27. [Product wiki](https://wiki.dfrobot.com/SKU_SEN0641_RS485_RS485_Photosynthetically_Active_Radiation_PAR_Sensor)
28. [Dimensional Drawing](https://wiki.dfrobot.com/SKU_SEN0641_RS485_RS485_Photosynthetically_Active_Radiation_PAR_Sensor#target_5)
29. [Communication Protocol](https://wiki.dfrobot.com/SKU_SEN0641_RS485_RS485_Photosynthetically_Active_Radiation_PAR_Sensor#target_6)
30. [Tutorial](https://wiki.dfrobot.com/SKU_SEN0641_RS485_RS485_Photosynthetically_Active_Radiation_PAR_Sensor#target_7)
31. [FAQ](https://wiki.dfrobot.com/SKU_SEN0641_RS485_RS485_Photosynthetically_Active_Radiation_PAR_Sensor#target_8)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/S/E/SEN0641-1.jpg)