The DHT22 (AM2302) Digital Temperature & Humidity Sensor is an advanced sensor offering precise environmental measurements with improved accuracy and a wider range than the DHT11. It is ideal for Arduino, Raspberry Pi, ESP32, and DIY electronics projects, including weather stations, home automation, and environmental monitoring applications. Key Features & Specifications Temperature Range: -40°C to 80°C Temperature Accuracy: ±0.5°C Temperature Resolution: 0.1°C Humidity Range: 0–100% RH Humidity Accuracy: ±2% RH Response Time: ~2 seconds Interface: Single-wire digital (DHT protocol) Compatibility: Arduino, Raspberry Pi, ESP32 Applications: Weather stations, environmental monitoring, indoor/outdoor automation What’s Included 1 × DHT22 (AM2302) Digital Temperature & Humidity Sensor 1 × 3-pin 10cm female-to-female jumper wire Getting Started Using the DHT22 with your microcontroller is simple: Connect VCC to 3.3–5V and GND to ground. Connect the data pin to a digital GPIO pin on your microcontroller. Use libraries such as DHT sensor library for Arduino or Python modules on Raspberry Pi to read temperature and humidity. Check sensor timing: the DHT22 has a slower sampling rate (~0.5 Hz), so read data every 2 seconds. For multiple sensors, ensure each has a separate data pin or appropriate timing between readings. Troubleshooting Tips If readings seem unstable, check wiring and power stability. Keep the sensor away from condensation and extreme moisture exposure. Ensure libraries are correctly installed and the proper GPIO pin is used. Comparison & Alternatives For beginners or simple indoor projects, consider the DHT11 Digital Temperature & Humidity Sensor. Both sensors are compared in detail in our Best Arduino Digital Temperature Sensors guide, which also includes BME280 and DS18B20 comparisons. Related Products DHT11 vs DHT22 Sensors Comparison + Wiring & Code Examples DHT11 Digital Temperature & Humidity Sensor DHT22 AM2302 Module BME280 I2C / SPI Temp, Humidity & Pressure Sensor DS18B20 Stainless Steel Temperature Sensor Other Arduino & ESP32 Temperature Sensors FAQ What is the difference between DHT11 and DHT22 We've produced a detailed guide comparing the DHT11 and DHT22 digital temperature sensors. For a quick summary, the DHT11 is lower cost but has a limited temperature range and lower accuracy. The DHT22 offers higher precision, a wider operating range, and better suitability for outdoor or long-term monitoring projects. Does the DHT22 work with Arduino, Raspberry Pi, and ESP32? Yes. The DHT22 (AM2302) works with most popular microcontrollers and single-board computers, including Arduino, Raspberry Pi, and ESP32. Libraries and example code are widely available, making it easy to integrate into your projects. Do I need a pull-up resistor This DHT22 modules include a built-in pull-up resistor on the data line. If you are using a bare sensor, an external pull-up resistor may be required for stable communication. How often can I read data from the DHT22? The DHT22 has a typical sampling rate of around 0.5 Hz. For reliable operation and accurate readings, you should read data no more frequently than once every 2 seconds. Can I use the DHT22 outdoors? The DHT22 is suitable for indoor and sheltered environments. For outdoor use, it should be placed in a protective, ventilated enclosure that shields it from direct rain, condensation, and extreme conditions while still allowing air flow. How accurate is the DHT22 compared to the DHT11? The DHT22 offers a wider measurement range and better accuracy than the DHT11. It provides temperature readings from -40°C to 80°C with ±0.5°C accuracy and humidity readings from 0–100% RH with ±2% RH accuracy, making it better suited for precise environmental monitoring. The DHT22 combines wide-range measurement, high accuracy, and reliable single-wire digital output, making it perfect for any environmental sensing project where precise temperature and humidity readings are required.
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