Description Grove - SEN55 All-in-one Environmental Sensor is a Grove I2C ambient sensor for air-quality monitoring. It measures particulate matter, VOC index, NOx index, relative humidity and temperature, giving up to 8 environmental data outputs for HVAC, air purifiers, smart buildings, industrial monitoring and long-term indoor air-quality detection. Powered by Sensirion sensing technology, the module uses calibrated digital output, proprietary algorithms and laser scattering particulate sensing. A single Grove cable connects it to compatible controllers or expansion boards, making integration straightforward for Arduino, Raspberry Pi, Seeeduino and other Grove-based projects. Features All-in-one environmental sensing: measures PM1.0, PM2.5, PM4, PM10, VOC index, NOx index, humidity and temperature. Easy integration: proprietary algorithms support HVAC and air purifier applications without complex signal processing. Adaptive temperature response: the STAR engine improves response speed, measurement accuracy and stability. Low power operation: about 6.8 mA in RHT/Gas-Only measurement mode and 2.6 mA in idle mode. Long-term reliability: calibrated digital outputs and robust sensing components support continuous operation for more than 10 years. Grove I2C interface: one Grove cable simplifies wiring for fast prototyping and edge deployment. Applications Heating, ventilation and air conditioning systems Air purifiers and indoor air-quality monitoring Respiratory healthcare and harmful gas alarms Particulate matter alerts and fire alarm projects Chemical experiments, smart farms and industrial sensing Specifications Sensor Module Parameter Value Interface Grove I2C Sampling interval 1 ± 0.03 s Lifetime >10 years with 24 h/day operation Acoustic emission level 24 dB(A) at 0.2 m Long-term acoustic emission drift +0.5 dB(A) per year at 0.2 m Particulate Matter Parameter Value Mass concentration range 0 to 1,000 µg/m³ PM1.0 particle size range 0.3 to 1.0 µm PM2.5 particle size range 0.3 to 2.5 µm PM4 particle size range 0.3 to 4.0 µm PM10 particle size range 0.3 to 10.0 µm Temperature, Humidity and Gas Output Parameter Value Temperature accuracy Typical ±0.45 °C, max ±0.7 °C at 15 to 30 °C and 50% RH Temperature repeatability