HR202 Resistive Humidity Sensor💧🌡️

The HR202 Resistive Humidity Sensor is a reliable, cost-effective solution for measuring humidity and temperature in embedded systems and data-logging applications. With a single‑wire digital output, it integrates easily with Arduino, Raspberry Pi, ESP32, and other microcontroller platforms. Designed for both electronics engineers and hobbyists, it offers fast response, broad operating voltage support, and dependable performance for weather stations, HVAC, and automation projects.

Technical Specifications 📊

Temperature Measurement 🌡️

• Accuracy: ±0.5°C
• Measurement Range: -40 to 80°C
• Resolution: 0.1°C

Humidity Measurement 💧

• Accuracy: ±2–5% RH (accuracy decreases with increasing humidity)
• Measurement Range: 0 to 100% RH
• Resolution: 0.1% RH

Electrical & Interface 🔌

• Power Supply: 3.3V to 6V DC
• Output: Digital signal using a single‑wire communication protocol

Timing ⏱️

• Response Time: Typically less than 2 seconds

Mechanical 📏

• Dimensions: Approximately 15 mm × 12 mm × 5.5 mm

Key Features ⭐

• High accuracy in both temperature (±0.5°C) and humidity (±2–5% RH) measurements
• Wide temperature range from -40 to 80°C
• Full-range humidity measurement from 0% to 100% RH
• Broad voltage compatibility of 3.3V to 6V for versatile system integration
• Single‑wire digital interface for simple wiring and coding with Arduino, Raspberry Pi, and other microcontrollers
• Fast response time, typically under 2 seconds

Applications 🛠️

The HR202 sensing element is widely used in environmental monitoring and control systems. In many designs, it is integrated into digital modules that expose a single‑wire interface (e.g., DHT22/AM2302‑type modules), making it ideal for:

• Weather monitoring and DIY IoT weather stations
• HVAC control and indoor air quality measurement
• Industrial automation and process monitoring
• Consumer electronics and smart home projects
• Data logging with Arduino, Raspberry Pi, ESP32, and similar microcontroller platforms

Integration & Compatibility 🔗

Designed for quick prototyping and production use, the HR202 interfaces cleanly with popular development boards:

• Connect to 3.3V–6V power and ground
• Use a single GPIO for the single‑wire data line
• Leverage community libraries and examples (e.g., common DHT‑style libraries) for rapid bring‑up on Arduino and Raspberry Pi
• Follow the timing and electrical guidelines in the datasheet for best accuracy and stability

Resources 📄

Click here to access the datasheet for detailed electrical characteristics, timing diagrams, and integration notes.