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Humidity Detection Sensor Module - HR202

SKU: EPULDPIDQQ
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4.7 (58 reviews)
The HR202 Humidity Detection Sensor Module is a compact resistive humidity sensing module designed for detecting changes in relative humidity (RH) and providing a threshold-based output for monitoring and control applications. The module uses an HR202 resistive humidity sensor together with an LM393 voltage comparator, allowing it to detect when environmental humidity rises above or falls below an adjustable preset...
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The HR202 Humidity Detection Sensor Module is a compact resistive humidity sensing module designed for detecting changes in relative humidity (RH) and providing a threshold-based output for monitoring and control applications. The module uses an HR202 resistive humidity sensor together with an LM393 voltage comparator, allowing it to detect when environmental humidity rises above or falls below an adjustable preset level.

The HR202 sensing element changes its impedance according to the moisture content of the surrounding air. The onboard comparator circuit compares the sensor signal against the threshold set using the adjustable potentiometer and provides a digital HIGH/LOW switching output. This makes the module particularly useful for humidity alarms, ventilation control, dehumidifier control, storage monitoring, and other applications where a humidity threshold needs to trigger an action.

The module typically operates from 3.3V to 5V DC and covers a nominal humidity sensing range of approximately 20% RH to 95% RH. Common 3-pin versions provide a digital output, while some 4-pin variants provide both analog and digital outputs.

With its compact size, adjustable sensitivity, onboard power and output indicators, and simple microcontroller interface, the HR202 module is suitable for Arduino, ESP32, STM32, Raspberry Pi Pico, RP2040, PIC, AVR, and other digital control systems.

Key Features

  • Based on the HR202 resistive humidity sensor
  • Detects changes in environmental relative humidity
  • LM393 voltage comparator circuit
  • Adjustable humidity detection threshold
  • Onboard potentiometer for sensitivity adjustment
  • Digital HIGH/LOW switching output
  • Analog output available on some module variants
  • Operating voltage from 3.3V to 5V DC
  • Nominal humidity sensing range of 20% RH to 95% RH
  • Low power consumption
  • Power indicator LED
  • Digital output status indicator LED
  • Clean comparator-based switching signal
  • Compact and lightweight PCB design
  • Mounting hole for easy installation
  • Simple connection to microcontrollers
  • Suitable for humidity-triggered alarms
  • Useful for ventilation and dehumidification control
  • Suitable for environmental monitoring projects

Shipping & Returns

Orders placed before 3 PM IST will be shipped on the same day (excluding Sundays and Public holidays) through our shipping partners. In rare cases, the pickup may get delayed during Public holidays / Bandh / Environmental disturbances.

Specifications

Specifications:

Module Type: Humidity Detection Sensor Module
Sensor Element: HR202 Resistive Humidity Sensor
Comparator IC: LM393
Sensing Parameter: Relative Humidity
Humidity Detection Range: Approximately 20% RH to 95% RH
Sensor Operating Temperature Range: Approximately 0°C to 60°C
Module Operating Voltage: 3.3V to 5V DC
Typical Module Operating Current: Approximately 15mA
Output Type: Digital Switching Output on Common 3-Pin Versions
Analog Output: Available on Some 4-Pin Module Versions
Digital Output Level: LOW / HIGH Logic Signal
Threshold Adjustment: Onboard Potentiometer
Sensitivity Adjustment: Supported
Power Indicator: LED
Output Status Indicator: LED
Typical PCB Dimensions: Approximately 32mm × 14mm to 16mm
Mounting Hole: Available
Signal Conditioning: LM393 Comparator Circuit
Compatibility: Arduino UNO, Nano, Mega, ESP32, ESP8266, STM32, Raspberry Pi Pico, RP2040, PIC, AVR and Other Compatible Controllers.

Additional Resources

Humidity Sensor.PDF

FAQ

1. What is the HR202 Humidity Detection Sensor Module used for?

The module is used to detect changes in environmental humidity and provide a switching signal when the humidity crosses a selected threshold. It is commonly used in humidity alarms, ventilation control, storage monitoring, greenhouse projects, and automation systems.

2. What is the humidity range of the HR202 sensor module?

The HR202 sensing element is commonly specified for a relative humidity range of approximately 20% RH to 95% RH, with an operating temperature range of approximately 0°C to 60°C.

3. Can the humidity detection threshold be adjusted?

Yes. The module includes an onboard potentiometer that allows the digital switching threshold to be adjusted according to the required humidity level.

4. Can the HR202 module be used with Arduino and ESP32?

Yes. The module operates from 3.3V to 5V and can be interfaced with Arduino, ESP32, ESP8266, STM32, Raspberry Pi Pico, RP2040, PIC, AVR, and other compatible microcontrollers.

5. Does the HR202 module provide an exact humidity percentage reading?

The common 3-pin version is mainly intended for threshold detection and provides a digital ON/OFF output rather than a direct numerical RH percentage. Some 4-pin versions expose an analog output, but accurate RH measurement requires calibration and temperature compensation.