room temperature &humidity monitor use HTU21D humidity&temperature sensor

  Digital Temperature and Humidity Sensor - HTU21D Feature 1. digital temperature and humidity sensor
2. range:1-100%RH
3. original, high quality, competitive price       Parameters:   1)storage temperature: -40 to 125ºC 2)supply voltage: 3.8V 3)Humidity Operating Range: 1-100%RH 4)Temperature operating range: -40 to 125ºC 5)VDD to GND:-0.3 to 3.6V 6)Digital I/O pins (DATA/SCK) to VDD:-0.3 to VDD+0.3v 7)-10 to +10 mA   Features: (1)DFN type package  
(2)Relative Humidity and Temperature Digital Output, I2C interface 
(3)Fully calibrated 
(4)Lead free sensor, reflow solderable
(5)Low power consumption 
(6)Fast response time and very low temperature coefficient       DESCRIPTION (1) HTU21D, the new humidity and temperature sensor of MEAS is about to set new standards in terms of size and intelligence: Embedded in a reflow solderable Dual Flat No leads (DFN) package of 3 x 3mm foot print and 1mm height it provides calibrated, linearized signals in digital, I²C format.   (2) HTU21D sensors are dedicated humidity and temperature plug and play transducers for OEM applications where reliable and accurate measurements are needed. Direct interface with a micro-controller is made possiblewith the module humidity and temperature digital outputs.   (3) HTU21D sensors are low power consumption designed for high volume and cost sensitive applications with tight space constraints.   (4) Every sensor is individually calibrated and tested. Lot identification is printed on the sensor and an electronicidentification code is stored on the chip – which can be read out by command.   (5)Furthermore, the resolution of HTU21D sensor can be changed by command (8/12bit up to 12/14bit for RH/T),low battery can be detected and a checksum improves communication reliability.   (6) With made improvements and the miniaturization of the sensor the performance-to-price ratio has beenimproved – and eventually,any device should benefit from the cutting edge energy saving operation mode.