ASAIR AHT21B V1.1 Digital Temperature & Humidity Sensor Module I²C 2.2–5.5V

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ASAIR AHT21B V1.1 Digital Temperature & Humidity Sensor Module I²C 2.2–5.5V The AHT21B_V1.1 ASAIR sensor module is an advanced digital temperature and humidity sensor designed for high accuracy and reliability in demanding environments. It integrates a dedicated ASIC chip with a MEMS capacitive humidity sensing element and an onboard temperature sensor, enabling precise environmental monitoring. The sensor provides calibrated digital output via the I²C interface, making it easy to integrate with microcontrollers such as Arduino, ESP, and Raspberry Pi systems. This module is engineered for stability and long-term performance, even in harsh conditions. It offers fast response time, strong anti-interference capability, and improved accuracy compared to earlier sensor generations. Due to its compact size and low power consumption, it is widely used in automation systems, weather monitoring, HVAC, and smart home applications where reliable environmental data is essential. Features: Measures both temperature and relative humidity. High accuracy and factory-calibrated output. Digital I²C communication interface. Fast response time and stable performance. Strong resistance to interference. Compact size for embedded applications. Long-term reliability and consistency. Suitable for industrial and consumer use. Specifications: Parameter Value Model: AHT21B_V1.1 Manufacturer: ASAIR Operating Voltage: 2.2V – 5.5V DC Temperature Range: -40°C to +80°C Humidity Range: 0% – 100% RH Temperature Accuracy: ±0.5°C Humidity Accuracy: ±3% RH Interface: I²C Digital Output Sensor Type: MEMS Capacitive Pinout: Applications: Weather stations and environmental monitoring. HVAC and climate control systems. Smart home automation. Industrial control systems. Data logging and IoT devices. Medical and laboratory equipment. Packages Included: 1x ASAIR AHT21B V1.1 Digital Temperature & Humidity Sensor Module I²C 2.2–5.5V Documents: Product specifications. Download product design guide .