HR202 Resistive Humidity Sensor – Analog Output 20-95% RH
HR202 Resistive Humidity Sensor – Analog Output, 20-95% RH
The HR202 resistive humidity sensor detects relative humidity by changing its resistance in response to moisture levels. It provides an analog voltage output proportional to humidity, making it easy to interface with a microcontroller’s ADC for environmental monitoring projects. This sensor is widely used in climate control, agriculture, and DIY weather stations.
Key Specifications
| Specification | Value |
|---|---|
| Operating Voltage | 3.3V – 5V DC |
| Humidity Range | 20% – 95% RH |
| Accuracy | ±5% RH (at 25°C, 60% RH) |
| Output Type | Analog voltage (0-3V typical) |
| Response Time | <10 seconds (63% step change) |
| Operating Temperature | 0°C – 60°C |
What You Can Build With This
- Automated plant watering system that waters when soil moisture drops
- Portable weather station with LCD display for temperature and humidity
- Smart bathroom exhaust fan that activates at high humidity levels
- IoT greenhouse humidity logger using ESP8266 and cloud dashboard
Compatibility
The HR202 operates with any microcontroller that has an analog-to-digital converter (ADC). It works seamlessly with Arduino Uno, Nano, Mega, ESP32, ESP8266, and Raspberry Pi (via external ADC like MCP3008). Supply voltage of 3.3V to 5V allows direct connection without level shifting in most cases.
Wiring Notes
Connect VCC to 5V (or 3.3V), GND to common ground, and the analog output pin to any analog input on your microcontroller (e.g., A0 on Arduino). No pull-up resistor is needed for standard modules. For bare sensor elements, use a 10kΩ resistor in a voltage divider configuration.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino?
Yes, the HR202 outputs an analog signal that can be read by any Arduino board's analog input pin (A0-A5). Simply connect VCC to 5V, GND to GND, and OUT to A0, then use analogRead() in your sketch.
How can I convert the analog reading to humidity percentage?
The sensor’s datasheet provides a conversion curve, but a common approach is to calibrate it against a known humidity source and map the ADC values to 0-100% RH using linear or polynomial approximation in your code.
Can this sensor detect condensation or dew?
The HR202 is not designed for condensation; direct water contact may damage it or cause inaccurate readings. It works best in air where humidity stays below 95% RH without condensation.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items