{"product_id":"htu21d-temperature-and-humidity-sensor-module-i2c-compoden","title":"HTU21D Temperature and Humidity Sensor Module I2C — Compoden","description":"\u003ch1\u003eHTU21D Temperature and Humidity Sensor Module I2C\u003c\/h1\u003e\n\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSensor Chip\u003c\/td\u003e\n\u003ctd\u003eHTU21D\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd\u003eI2C (address 0x40)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e1.5V – 3.6V (3.3V typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-40°C to +125°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHumidity Range\u003c\/td\u003e\n\u003ctd\u003e0% to 100% RH\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e±0.3°C (temp), ±2% RH\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-indoor-weather-station\"\u003ePersonal weather station with real-time data logging\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eSmart thermostat or humidity controller for home automation\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/esp32-greenhouse-monitoring-kit-soil-and-climate-sensor-network\"\u003eGreenhouse climate monitoring system\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10-sensor-environmental-data-logger-kit-for-arduino-mega\"\u003ePortable environmental data logger for field research\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis 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.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect 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.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery 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.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino Uno?\u003c\/summary\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes this sensor require calibration?\u003c\/summary\u003e\u003cp\u003eNo manual calibration is needed. The HTU21D is factory-calibrated and delivers digital data directly, maintaining accuracy over its lifespan.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan it be used outdoors?\u003c\/summary\u003e\u003cp\u003eYes, 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.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery 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.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445001281901,"sku":"CDN-0622","price":160.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_038db7c0-1362-4f74-8903-439494c78d09.jpg?v=1781512736","url":"https:\/\/compoden.com\/products\/htu21d-temperature-and-humidity-sensor-module-i2c-compoden","provider":"Compoden","version":"1.0","type":"link"}