Measurement Specialties HTU21D Digital Relative Humidity Sensor
TE Connectivity Measurement Specialties HTU21D Digital Relative Humidity Sensor is embedded in a reflow solderable Dual Flat No leads (DFN) package with a 3 x 3mm foot print and 1mm height.
The HTU21D provides calibrated, linearized signals in a digital, I²C format. HTU21D sensors are dedicated humidity and temperature plug and play transducers for OEM applications. Direct interface with a micro-controller is enabled with the modular humidity and temperature digital outputs.
HTU21D sensors are low power consumption sensors created for high volume and cost sensitive applications with extreme space constraints. Every sensor is individually calibrated and tested. Lot identification is printed on the sensor and an electronic identification code is stored on the chip. The resolution of HTU21D sensor can be altered by command (8/12bit up to 12/14bit for RH/T), low battery can be detected and a checksum improves communication reliability
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
Supply voltage: 1.5V-3.6Humidity measuring range: 0-100% RHTemperature measuring range: -40 ℃ -105 ℃Maximum power consumption: 2.7uWCommunication: I2CHumidity accuracy range (10% RH to 95% RH): HTU21D ± 2% RHHumidity Hysteresis: ± 1% RHMeasurement time: 50msIn drift: -0.5% RH / yearResponse time: 5 s
1 x HTU21D Temperature And Humidity Sensor Module
link
https://github.com/enjoyneering/HTU21Dhttps://github.com/adafruit/Adafruit_HTU21DF_Library
9