SKU: SEN0659
This infrared CO2 sensor uses NDIR technology for accurate air CO2 detection. It has a 400~5000PPM range, supports manual calibration, and a 5s response time (indicator flashes on response). With RS485 + Modbus-RTU, it connects to Arduino UNO via DFR0845 easily. IP65 protection (waterproof breathable membrane) suits indoor, pipeline, greenhouse, and fresh air system monitoring.
Downloadable Resources
1. Example Code for Arduino-Read CO2 Value
This project demonstrates how to read CO2 concentration values from the RS485 Infrared CO2 Sensor (400-5000ppm) using an Arduino board. Users will learn to interface with the sensor via the RS485 protocol, implement Modbus-RTU communication, and process raw sensor data into readable CO2 values.
Reference
The article provides an in-depth explanation of communication protocols for CO2 sensors, emphasizing RS485 and Modbus-RTU, detailing data frames, error checking with CRC, and sensor calibration methods.
FAQ
1. The computer has multiple COM ports, and the selected port is incorrect.
2. The device address is wrong, or there are devices with duplicate addresses (all factory defaults are 1).
3. Baud rate, check mode, data bit, stop bit error.
4. Host polling interval and waiting response time are too short, both need to be set above 200ms.
5. 485 bus is disconnected, or A and B lines are connected in reverse.
6. Too many devices or too long wiring, power supply should be provided nearby, 485 enhancer should be added, and 120Ω terminal resistance should be added.
7. USB to 485 driver is not installed or damaged.
8. Equipment is damaged.
Note: To ensure the accuracy of the equipment, please clean the lower surface of the measuring area of the equipment regularly to keep it clean and free of dust or other foreign matter.
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