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What humidity sensor is used in the micro-module

The DHT22 (also known as AM2302) is the humidity sensor commonly used in micro-modules.

The DHT22 sensor is a digital-output sensor that measures relative humidity and temperature using a capacitive humidity sensor combined with a thermistor for temperature measurement . It outputs a digital signal, making it easy to interface with microcontrollers such as Arduino, ESP32, or ESP8266 . The sensor is available both as a standalone component with four pins (VCC, DATA, NC, GND) and as a compact module with three pins (VCC, DATA, GND) and a built-in pull-up resistor, simplifying wiring and integration .

Key Features
  • Measurement Range: 0–100% relative humidity
  • Accuracy: ±2–5% RH
  • Temperature Range: -40°C to 80°C
  • Digital Output: Single-wire serial interface
  • Update Interval: Approximately every 2 seconds
Working Principle

The DHT22 uses a capacitive polymer film that changes its dielectric constant when exposed to water vapor, causing a measurable capacitance shift. This change is converted into a digital signal by the sensor's internal IC, which also handles calibration and timing . The thermistor measures temperature, which is used to compensate the humidity reading for more accurate results.

Applications

Micro-modules with DHT22 sensors are widely used in:

  • IoT devices and smart home systems
  • Weather stations and environmental monitoring
  • HVAC systems
  • Consumer electronics requiring humidity control The DHT22 is preferred over the DHT11 for micro-modules due to its higher accuracy, wider measurement range, and better resolution, although it is slightly more expensive and requires a minimum 2-second reading interval .
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