21

DHT21 Sensor Specification: 

• Model: AM2301
• Power supply: 3.3-5V DC
• Output signal: digital signal via single-bus
• Sensing element: Polymer humidity capacitor
• Measuring range: humidity 0-100%RH; temperature -40~80Celsius
• Accuracy: humidity +-3%RH(Max +-5%RH); temperature <+-1Celsius
• Resolution or sensitivity: humidity 0.1%RH; temperature 0.1Celsius
• Repeatability: humidity +-1%RH; temperature +-0.2Celsius
• Humidity hysteresis: +-0.3%RH
• Long-term Stability: +-0.5%RH/year
• Sensing period: Average: 2s
• Dimensions size 59*27*13.5mm