DHT21 AM2301 Capacitive Digital Temperature and Humidity Sensor AM2301A 2025 revision Why this sensor matters Accurate, stable readings of relative humidity and temperature in a single compact module. Ideal when a reliable, easy to integrate environmental sensor is needed. Replaces SHT10 and SHT11 in applications that require a capacitive humidity element with digital output. Compatible as a dropin sensing solution for many projects. Simplifies development and monitoring by combining both measurements with a standard digital interface that pairs with common microcontrollers. Key benefits Twoinone sensing: measures relative humidity and temperature with a single device, reducing component count. Digital output: simplifies wiring and firmware compared to analog sensors and reduces noise susceptibility. Compact form factor: small footprint for tight enclosures and embedded systems. Versatile integration: works with typical microcontroller and microcomputer platforms using a singlewire digital protocol. Consistent performance: designed to provide repeatable readings suitable for monitoring and control tasks. Main features Function: capacitive humidity sensor plus temperature sensing element with digital output. Models: DHT21 and AM2301. AM2301A denotes the 2025 revision for this product line. Compatibility: suitable as a replacement for SHT10 and SHT11 sensor modules in many applications. Interface: singlewire digital communication for simple connection to microcontrollers. Physical characteristics: compact, enclosed sensor module for easy mounting and integration. Application readiness: suitable for embedded projects, environmental monitoring, HVAC control, and data logging. How it solves common problems Reduces wiring and signal conditioning work by delivering digital data directly to controllers. Saves board space and simplifies enclosure design by combining two measurements in one module. Lowers development time when replacing older SHT10 or SHT11 sensors because of compatible functionality and interface expectations. Practical use scenarios Indoor air monitoring: integrate into home automation or building management systems to track indoor temperature and humidity for occupant comfort and equipment protection. Greenhouse or grow room control: provide continuous humidity and temperature feedback to controllers that manage ventilation, heating, and misting systems. Weather station and IoT projects: add reliable environmental sensing to DIY weather stations, remote monitoring nodes, or data loggers where compact size and digital output are required. What customers should know before buying This product is a capacitive digital humidity and temperature sensor module identified as DHT21 and AM2301, with AM2301A marking for the 2025 revision. It is intended for integration into electronic projects and systems that accept a singlewire digital sensor input. The module replaces SHT10 and SHT11 sensors in many designs, offering similar functionality with a capacitive humidity element. Contents and connection Single sensor module ready for mounting and wiring into controller systems. Connect using the module pins and implement the singlewire protocol in firmware or use existing libraries that support DHT21 or AM2301 type devices. Summary A compact, easy to integrate capacitive temperature and humidity sensor offered as DHT21 and AM2301 with the AM2301A 2025 revision. Provides reliable digital readings for environmental monitoring, HVAC, greenhouse control, and IoT applications where a direct digital interface and combined sensing are required.