Product description

The HTU21D is a low-cost, easy to use, highly accurate, digital humidity and temperature sensor. This sensor is ideal for environmental sensing and data logging and perfect for a weather stations or humidor control systems. All you need is two lines for I2C communication and you'll have relative humidity readings and very accurate temperature readings as a bonus!

There are only four pins that need to be hooked up in order to start using this sensor in a project. One for VCC, one for GND, and two data lines for I2C communication. This breakout board has built in 4.7k pull up resistors for I2C communications. If you're hooking up multiple I2C devices on the same bus, you may want to disable these resistors

The new generation of HTU21D temperature and humidity sensor has established a new standard in size and intelligence: it is embedded in a dual-row flat no-lead DFN package suitable for reflow soldering, with a bottom surface of 3x3mm and a height of 1.1mm. The sensor outputs a calibrated digital signal in a standard I2C format. Diversified output modes, wide operating voltage range, and high temperature accuracy and humidity accuracy. HTU21 series modules are specially designed for low power consumption and small size applications. They have the advantages of good quality, fast response speed, strong anti-interference ability, high cost performance, etc., small size (3x3mm), and extremely low power consumption.

Important parameters of the sensor:

Power supply voltage: 1.5V—3.6

Humidity measurement range: 0-100%RH

Temperature measurement range: -40℃—105℃

Maximum power consumption: 2.7uW

Communication method: I2C

Humidity accuracy range (10%RH to 95%RH): HTU21D±2%RH

Humidity hysteresis: ±1%RH

Measuring time: 50ms

Annual drift: -0.5%RH/year

Response time: 5 s

At the same time, HTU21D can be fully compatible with SHT20 and SHT21 in Switzerland, and Pin to Pin can be implemented on the hardware pins without modifying the circuit board. The software program is also the same as the Swiss SHT20 and SHT21, which can realize compatible replacement without any modification. At the same time, HTU21D has a very good price advantage compared with Swiss SHT20 and SHT21, and it is very cost-effective.The HTU21D ultra-small temperature and humidity integrated digital output module is a product with excellent performance launched by the famous French sensor manufacturer Humirel. At the same time, HTU21D has great advantages in terms of price, performance, and power consumption.