DHT22 / AM2302 Temperature and Humidity Sensor

DHT22 / AM2302 Temperature and Humidity Sensor
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  • Product Code:SQ1065
  • Availability: 1000
  • $0.89
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Tags: DHT22, AM2302, temperature sensor, humidity sensor, digital sensor, Arduino, Raspberry Pi

The DHT22, also known as the AM2302, is a calibrated digital temperature and humidity sensor widely used in environmental monitoring, HVAC systems, and embedded projects. It combines a capacitive humidity sensing element and a thermistor with an 8-bit microcontroller that performs analog-to-digital conversion and outputs a fully calibrated digital signal. The sensor communicates over a single-wire bidirectional interface, requiring only one data line in addition to power and ground. Its factory calibration data is stored in on-chip OTP memory, ensuring consistent and reliable readings without the need for external calibration. With a temperature measurement range of -40°C to +80°C and a humidity range of 0% to 100% RH, the DHT22 delivers a temperature resolution of 0.1°C and an accuracy of ±0.5°C, along with a humidity resolution of 0.1% RH and an accuracy of ±2% RH. The sensor supports transmission distances of up to 100 meters, making it suitable for distributed sensing applications. Low power consumption and a supply voltage range of 3.3V to 5.5V allow easy integration with popular microcontroller platforms such as Arduino and Raspberry Pi. Typical applications include greenhouse monitoring, weather stations, incubation systems, and personal electronics projects. The sensor is provided in a compact 4-pin package with a standard 14 × 18 × 5.5 mm footprint.

Temperature humidity sensor Application

  1. Environmental temperature and humidity monitoring
  2. Greenhouse and agricultural climate control
  3. Weather stations and data loggers
  4. HVAC and ventilation systems
  5. Incubation and poultry equipment
  6. Embedded electronics and IoT projects
  7. Arduino and Raspberry Pi based sensing applications

Temperature humidity sensor Specification:

  1. Model: DHT22 / AM2302
  2. Main chip: AM2302
  3. Supply voltage: 3.3V to 5.5V DC
  4. Interface: Single-bus digital signal output
  5. Temperature measurement range: −40°C to +80°C
  6. Temperature resolution: 0.1°C
  7. Temperature accuracy: ±0.5°C
  8. Humidity measurement range: 0% to 100% RH
  9. Humidity resolution: 0.1% RH
  10. Humidity accuracy: ±2% RH (at 25°C)
  11. Response time: Approximately 2 seconds
  12. Transmission distance: Up to 100 meters
  13. Pin count: 4 (VDD, DATA, NC, GND)
  14. Dimensions: 14 × 18 × 5.5 mm
  15. Operating temperature (sensor body): −40°C to +80°C

Features:

  1. Fully calibrated digital output — no external calibration required
  2. Capacitive humidity sensor and thermistor integrated in one package
  3. On-chip OTP memory for calibration coefficients
  4. Single-wire bidirectional interface saves microcontroller pins
  5. Low power consumption suitable for battery-powered applications
  6. Long transmission distance up to 100 meters
  7. Wide supply voltage range: 3.3V to 5.5V
  8. Compatible with Arduino, Raspberry Pi, and other popular platforms
  9. Compact 4-pin package with standard 14 × 18 × 5.5 mm footprint
  10. High accuracy: ±0.5°C for temperature and ±2% RH for humidity
Interfaces
Interface Type 1 Wire
Sensor Parameters
Accuracy +-0.5°C (Temperature) , +-2% RH (Humidity)
Output Type Digital
Humidity Range 0% ~ 100% RH
Temperature Range -40°C ~ 80°C
Resolution 0.1°C (Temperature) , 0.1% RH (Humidity)
Component Features
Pin Number 4 Pins
Electrical Parameters
Input Voltage 3.3V ~ 5.5V
Physical Parameters
Size 25.1mm x 15.1mm x 7.7mm

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