m5-docs/docs/zh_CN/unit/envII.md

# ENV II

<el-tag effect="plain">SKU:U001-B</el-tag>

<div class="product_pic"><img src="assets/img/product_pics/unit/envII/envII_01.webp"></div>


## 描述


**ENV II** 是一款环境传感器,内部集成SHT30和BMP280，用于检测温度、湿度、大气压值数据.SHT30是高精度低功耗的数字温湿度传感器,并支持I2C接口(SHT30:0x44, BMP280:0x76).BMP280是一款专为移动应用而设计的绝对气压传感器，具有较高的精准度.适合应用在一些小型低功耗终端上.对于需要对环境数据进行快速采集检测的项目来说, ENV Unit是一个兼顾性能与性价比的不错选择.

## 产品特性

- 简单易用
- 较高精准度
- 支持IIC
- HY2.0-4P 接口, 支持平台 [UIFlow](http://flow.m5stack.com) 、 [Arduino](http://www.arduino.cc).
- 2x LEGO 兼容孔

## 包含

- 1x ENV-II Unit
- 1x HY2.0-4P线缆

## 应用

- 气象站
- 储谷仓环境监控

## 规格参数

<table class="table-1">
    <thead>
    <tr>
        <th>规格</th>
        <th>参数</th>
    </tr>
    </thead>
    <tbody>
        <tr>
            <td>最大温度测量范围</td>
            <td>-40 ~ 120 ℃</td>
        </tr>
        <tr>
            <td>最高测量精度</td>
            <td>0 ~ 60 ℃/±0.2℃</td>
        </tr>
        <tr>
            <td>湿度测量范围/误差</td>
            <td>10 ~ 90 %RH / ±2%</td>
        </tr>
        <tr>
            <td>大气压测量范围/误差</td>
            <td>300 ~ 1100hPa / ±1hPa</td>
        </tr>
        <tr>
            <td>通信协议</td>
            <td>I2C：SHT30(0x44),BMP280(0x76)</td>
        </tr>
        <tr>
            <td>工作温度</td>
            <td>32°F to 104°F ( 0°C to 40°C )</td>
        </tr>
        <tr>
            <td>净重</td>
            <td>5g</td>
        </tr>
        <tr>
            <td>毛重</td>
            <td>17g</td>
        </tr>
        <tr>
            <td>产品尺寸</td>
            <td>24.2*32.2*8.1mm</td>
        </tr>
        <tr>
            <td>包装尺寸</td>
            <td>67*53*12mm</td>
        </tr>
        <tr>
            <td>外壳材质</td>
            <td>Plastic ( PC )</td>
        </tr>
     </tbody>
</table>

## SHT30与DHT12对比

<table class="table-1">
    <thead>
    <tr>
        <th>/</th>
        <th>SHT30</th>
        <th>DHT12</th>
    </tr>
    </thead>
    <tbody>
        <tr>
            <td>最大温度测量范围</td>
            <td>-40 ~ 120 ℃</td>
            <td>-20 ~ 60 ℃</td>
        </tr>
        <tr>
            <td>温度测量误差</td>
            <td>0 ~ 60 ℃/±0.2℃</td>
            <td>±0.2℃</td>
        </tr>
        <tr>
            <td>湿度测量范围/误差</td>
            <td>10 ~ 90 %RH / ±2%</td>
            <td>20 ~ 95 %RH/0.1%</td>
        </tr>
     </tbody>
</table>

## EasyLoader

>EasyLoader是一个简洁快速的程序烧录器，其内置了一个产品相关的案例程序，通过简单步骤将其烧录至主控，即可进行一系列的功能验证.**(程序烧录前，请根据设备类型安装相应驱动程序. M5Core型主机[请点击此处查看CP210X驱动安装教程](zh_CN/arduino/arduino_development?id=安装串口驱动)，M5StickC/V/T/ATOM系列可免驱动使用)**

<div class="easyloader-box">
    <div style="background-color:white;">
        <div><img src="https://m5stack.oss-cn-shenzhen.aliyuncs.com/image/easyloader_intro.webp"></div>
        <div class="easyloader-btn">
            <a href="https://m5stack.oss-cn-shenzhen.aliyuncs.com/EasyLoader/Windows/UNIT/For%20M5Core/EasyLoader_ENV2_UNIT_With_M5Core.exe">Windows</a>
            <a href="https://m5stack.oss-cn-shenzhen.aliyuncs.com/EasyLoader/MacOS/UNIT/EasyLoader_ENV2_UNIT_With_M5Core.dmg">MacOS</a>
            <!-- <a>Linux</a>
            <a>MacOS</a> -->
        </div>
    </div>
    <div>
        <video id="example_video" controls>
            <source src="https://m5stack.oss-cn-shenzhen.aliyuncs.com/video/Product_example_video/Unit/ENVII.mp4" type="video/mp4">
        </video>
        <div class="easyloader-mask">
        <a>
            <svg id="play-btn" t="1583228776634" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="4152" width="75" height="75"><path d="M512 0C229.216 0 0 229.216 0 512s229.216 512 512 512 512-229.216 512-512S794.784 0 512 0z m0 928C282.24 928 96 741.76 96 512S282.24 96 512 96s416 186.24 416 416-186.24 416-416 416zM384 288l384 224-384 224z" p-id="4153" fill="#007aff"></path></svg></a>
            <p>案例描述:</p>
            <p>显示温湿度与大气压数据.</p>
        </div>
    </div>
</div>

### 管脚映射

<table>
 <tr><td>M5Core(PORT A)</td><td>GPIO22</td><td>GPIO21</td><td>5V</td><td>GND</td></tr>
 <tr><td>ENV II Unit</td><td>SCL</td><td>SDA</td><td>5V</td><td>GND</td></tr>
</table>

## 原理图

<img src="assets/img/product_pics/unit/envII_sch.webp">


## 相关链接

- **Datasheet** 
   - [BMP280](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/hat/BMP280-DS001-11_en.pdf)

   - [SHT30](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/unit/SHT3x_Datasheet_digital.pdf)


## 案例程序


?>该案例使用ENVII Unit，实现温度、湿度、大气压数据的读取。 请据你所使用的设备选择下方对应的案例程序。 

<el-card class="box-card" style="margin-bottom:20px">
   <div slot="header" class="clearfix">
   <span style="font-size: 22px; font-weight: bold;">Arduino</span>
   <i class="el-icon-s-management" style="float: right;"></i>
   </div>
   <div class="box-card-item">
   <a href='https://github.com/m5stack/M5Stack/tree/master/examples/Unit/ENVII_SHT30_BMP280'><el-tag>BASIC/M5GO/FIRE</el-tag></a>
   </div>
   <div class="box-card-item">
   <a href='https://github.com/m5stack/M5Core2/tree/master/examples/Unit/ENVII_SHT30_BMP280'><el-tag>Core2</el-tag></a>
   </div>
</el-card>

>注意: 1, 在进行程序编译前，请安装[Adafruit BMP280 Library](https://github.com/adafruit/Adafruit_BMP280_Library)

```clike
SHT3X.h - API
  //
  float cTemp=0;
  float fTemp=0;
  float humidity=0

Adafruit_BMP280.h - API

  float readPressure(void);

```

### 2. UIFlow

- [请点击此处获取UIFlow示例](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Unit/ENVII/UIFlow)

<img src="assets/img/product_pics/unit/envII/envII_03.webp" width="60%">

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