HTU21D Temperature and Humidity Sensor Module I2C — Compoden
HTU21D Temperature and Humidity Sensor Module I2C
The HTU21D is a digital temperature and humidity sensor module with I2C interface, providing accurate environmental readings in a compact breakout board. It is commonly used in weather stations, smart home systems, and industrial monitoring for real-time climate data. With factory calibration and low power consumption, it ensures reliable performance in battery-powered projects.
Key Specifications
| Specification | Value |
|---|---|
| Sensor Chip | HTU21D |
| Communication Interface | I2C (address 0x40) |
| Operating Voltage | 1.5V – 3.6V (3.3V typical) |
| Temperature Range | -40°C to +125°C |
| Humidity Range | 0% to 100% RH |
| Accuracy | ±0.3°C (temp), ±2% RH |
What You Can Build With This
- Personal weather station with real-time data logging
- Smart thermostat or humidity controller for home automation
- Greenhouse climate monitoring system
- Portable environmental data logger for field research
Compatibility
This module operates at 3.3V logic, making it directly compatible with 3.3V boards like ESP32, ESP8266, and Raspberry Pi. For 5V microcontrollers such as the Arduino Uno, use a logic level converter or ensure I2C pull-up resistors are connected to 3.3V to prevent damage. Common libraries like Adafruit HTU21D simplify integration.
Wiring Notes
Connect VCC to 3.3V, GND to ground, SDA to A4 (Arduino) or GPIO 21 (ESP32), and SCL to A5 (Arduino) or GPIO 22 (ESP32). If your board lacks built-in pull-ups, add 4.7kΩ resistors between SDA and 3.3V, and SCL and 3.3V.
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 Uno?
The HTU21D is a 3.3V sensor. For Arduino Uno (5V), use a logic level shifter or pull I2C lines up to 3.3V to avoid damage. A dedicated 3.3V–5V level converter module is recommended.
Does this sensor require calibration?
No manual calibration is needed. The HTU21D is factory-calibrated and delivers digital data directly, maintaining accuracy over its lifespan.
Can it be used outdoors?
Yes, it can be deployed outdoors if housed in a weatherproof enclosure to protect against rain, dust, and direct moisture. Avoid exposing the sensor element to liquid water.
📦 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