{"product_id":"aht21-digital-temperature-humidity-sensor-module-i2c","title":"AHT21 Temperature \u0026 Humidity Sensor Module I2C | SHT20","description":"\n\u003ch2\u003eAHT21 High-Precision Digital Temperature \u0026amp; Humidity Sensor Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAHT21 Temperature and Humidity Sensor Module\u003c\/strong\u003e delivers fast, accurate environmental readings via I2C communication, making it an ideal upgrade or replacement for the SHT20 and similar sensors. Whether you're building a weather station, a smart home controller, or an IoT data logger, this compact module gives you reliable, calibrated data every time.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Precision Sensing:\u003c\/strong\u003e Measures both temperature and relative humidity with excellent accuracy for demanding projects.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eI2C Interface:\u003c\/strong\u003e Simple two-wire communication makes integration with Arduino, Raspberry Pi, and other microcontrollers straightforward.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrop-in SHT20 Replacement:\u003c\/strong\u003e Fully compatible as a replacement for SHT20-based designs — no major redesign required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eResistance Sensor Technology:\u003c\/strong\u003e Utilises a robust resistance-based sensing method for stable, repeatable readings.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Lightweight:\u003c\/strong\u003e Small form factor fits easily into enclosures, prototyping boards, or custom PCBs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMetal Construction:\u003c\/strong\u003e Durable metal material ensures longevity in a variety of environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Works seamlessly with Arduino, ESP8266, ESP32, STM32, and other I2C-capable platforms.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e AHT21\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCommunication:\u003c\/strong\u003e I2C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSensor Type:\u003c\/strong\u003e Temperature \u0026amp; Humidity (Resistance Sensor)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e Switching Transducer\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustomizable:\u003c\/strong\u003e Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × AHT21 Temperature \u0026amp; Humidity Sensor Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerfect For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eArduino \u0026amp; microcontroller projects\u003c\/li\u003e\n  \u003cli\u003eSmart home automation systems\u003c\/li\u003e\n  \u003cli\u003eIoT environmental monitoring\u003c\/li\u003e\n  \u003cli\u003eWeather stations \u0026amp; data loggers\u003c\/li\u003e\n  \u003cli\u003eGreenhouse \u0026amp; HVAC control systems\u003c\/li\u003e\n  \u003cli\u003eIndustrial sensing applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eExplore more tools and components for your DIY projects:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Is the AHT21 sensor module compatible with Arduino boards?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, the AHT21 temperature and humidity sensor module uses I2C communication, which is fully compatible with Arduino Uno, Nano, Mega, ESP8266, ESP32, and most other I2C-capable microcontroller boards. Simply connect the SDA and SCL pins and use a standard I2C library to get started.\u003c\/p\u003e\n\u003ch4\u003eQ: Can the AHT21 module replace an existing SHT20 sensor in my project?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. The AHT21 is designed as a direct replacement for the SHT20 sensor module. It shares a compatible I2C interface and pinout, meaning minimal or no circuit modifications are needed when upgrading your existing SHT20-based design.\u003c\/p\u003e\n\u003ch4\u003eQ: What range of temperature and humidity can the AHT21 module measure?\u003c\/h4\u003e\n\u003cp\u003eA: The AHT21 sensor is capable of measuring a wide range of environmental conditions, making it suitable for indoor and outdoor monitoring applications including smart home systems, greenhouses, weather stations, and HVAC control environments.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is the AHT21 sensor module compatible with Arduino boards?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, the AHT21 temperature and humidity sensor module uses I2C communication, which is fully compatible with Arduino Uno, Nano, Mega, ESP8266, ESP32, and most other I2C-capable microcontroller boards. 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