產品說明9999

Humidity and Temperature Sensor Breakout - HTU21D

所述HTU21D是一種低成本，容易使用的，高度精確的，數字濕度傳感器。所有你需要的是兩條線，因為我² I2C通信，你就會有相對濕度讀數，如“45.2％”或“23.1％”，非常準確的溫度讀數作為獎勵！

事情你應該知道這個傳感器：

• 使用I ² C接口
• 為±2％的典型濕度精度
• ±0.3℃的典型溫度精度
• 工作在0至100％的濕度但這種傳感器是不推薦用於惡劣環境中，它可以來在與水接觸（諸如雨）。
• 3.3V傳感器-使用內嵌的邏輯電平轉換器或10K電阻限制5V信號
• 這裡的數據表
• 只有一個HTU21D傳感器可以駐留在I ²在時刻C總線

這種傳感器是理想的環境傳感和數據記錄。完美的氣象站或雪茄控制系統。這是一個非常好的替代數字濕度傳感器如SHT15，SHT21，SHT25，HIH-4030，HIH6130和電容式濕度傳感器，如HH10D。

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.

Dimensions: 0.6 x 0.6"

Documents:

• Schematic
• Eagle Files
• Datasheet (HTU21D)
• Hookup Guide
• HTU21D Library
• GitHub

Hooking It Up

Wiring up the HTU21D humidity sensor is very easy! We recommend soldering four male headers to the breakout board and using the HTU21D in a breadboard.

 

連接：突圍板的Arduino

• VCC→3.3V
• GND→GND
• SDA→A4
• SCL→A5

 

This board runs at 3.3V. Be sure to power the board from the 3.3V pin! Because I²C is an open drain signal, there’s no need to worry about level shifting the signal; the 3.3V signal will be adequate to communicate with the Arduino and the signal will never reach a dangerous level for the pins on the HTU21D.

Note: 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.

 

 

 

 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. On an Arduino board connect the SDA pin on the breakout board to A4 and SCL to A5. If you have a newer Arduino, you can connect the SDA and SCL lines directly to the SDA and SCL lines broken out on the Arduino headers.

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