DHT11 / DHT11 Digital Temperature and Humidity Sensor A compact, lowcost digital sensor that measures ambient temperature and relative humidity and outputs a calibrated digital signal. The DHT11 is easy to integrate with microcontrollers and singleboard computers, making it a solid choice for basic environmental monitoring and simple DIY projects. Key benefits Simple, reliable readings: Provides readytouse digital temperature and humidity data without the need for analogtodigital conversion. Easy integration: Singlewire digital interface and widely supported libraries make setup with Arduino, Raspberry Pi, ESP8266/ESP32 and other controllers quick. Affordable and practical: Low cost and sufficient accuracy for household, hobby, and many educational applications. Main features and specifications Measurements: Relative humidity and temperature. Humidity range: 20–90% RH, typical accuracy ±5% RH, resolution 1% RH. Temperature range: 0–50°C, typical accuracy ±2°C, resolution 1°C. Interface: Singlewire digital signal (one data pin); sensor requires a pullup resistor (typically 4.7 kΩ to 10 kΩ) on the data line. Operating voltage: 3 to 5 V DC. Sampling rate: Up to 1 reading per second (1 Hz). Package: Plastic encapsulated sensor element suitable for generalpurpose, noncondensing environments. Pinout (typical module/header): VCC, Data, GND (module variations may include an unused NC pin on the raw sensor package). Compatibility and support Broad compatibility with microcontrollers and SBCs (Arduino, Raspberry Pi, ESP series, etc.). Numerous opensource libraries and example code available for quick integration and testing. Typical applications Home and office environment monitoring: Track indoor temperature and humidity for comfort, simple HVAC feedback, or basic data logging. DIY weather stations and educational projects: Teach sensors and data acquisition using microcontrollers and singleboard computers. Basic environmental sensing for small enclosures: Monitor humidity and temperature in terrariums, greenhouses, instrument cabinets, or storage boxes where moderate accuracy and low cost are acceptable. Practical notes Not suited for precision scientific measurements or environments outside the specified ranges (for example, below 0°C, above 50°C, or nearcondensing conditions). Ensure proper placement away from direct heat sources or condensation; allow adequate airflow for accurate ambient readings. Use a recommended pullup resistor on the data line and follow available library examples for timing and read routines. The DHT11 is a straightforward, economical sensor for projects that require basic, reliable temperature and humidity readings with simple digital output and broad platform support.