m5-docs/docs/en/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>

## Description

**ENV II** is an environmental sensor which can sense temperature, humidity and atmospheric pressure. It integrates the SHT30 and BMP280 sensors and is programmed over the I2C protocol(SHT30:0x44, BMP280:0x76).

SHT30 is a digital temperature and humidity sensor with high precision and low power consumption.

BMP280 is an absolute barometric pressure sensor which is especially designed for mobile applications. It offers the highest flexibility to optimize the device regarding power consumption, resolution and filter performance.

## Product Features

-  High-precision
-  Support I2C
-  GROVE interface, support [UIFlow](http://flow.m5stack.com) and [Arduino](http://www.arduino.cc)
-  Two Lego installation holes

## Includes

- 1x ENV II Unit
- 1x Grove Cable

## Specification

<table class="table-1">
    <thead>
    <tr>
        <th>Specification</th>
        <th>Parameter</th>
    </tr>
    </thead>
    <tbody>
        <tr>
            <td>Max temperature measuring range</td>
            <td>-40 ~ 120 ℃</td>
        </tr>
        <tr>
            <td>Typical temperature tolerance</td>
            <td>0 ~ 60 ℃/±0.2℃</td>
        </tr>
        <tr>
            <td>Humidity measuring range</td>
            <td>10 ~ 90 %RH / ±2%</td>
        </tr>
        <tr>
            <td>Air pressure measuring range</td>
            <td>300 ~ 1100hPa / ±1hPa</td>
        </tr>
        <tr>
            <td>Communication protocol</td>
            <td>I2C：SHT30(0x44),BMP280(0x76)</td>
        </tr>
        <tr>
            <td>Operating temperature range</td>
            <td>32°F to 104°F ( 0°C to 40°C )</td>
        </tr>
        <tr>
            <td>Net weight</td>
            <td>5g</td>
        </tr>
        <tr>
            <td>Gross weight</td>
            <td>17g</td>
        </tr>
        <tr>
            <td>Product Size</td>
            <td>24.2*32.2*8.1mm</td>
        </tr>
        <tr>
            <td>Package Size</td>
            <td>67*53*12mm</td>
        </tr>
        <tr>
            <td>Case material</td>
            <td>Plastic ( PC )</td>
        </tr>
     </tbody>
</table>


## Comparison between SHT30 and DHT12

<table class="table-1">
    <thead>
    <tr>
        <th>/</th>
        <th>SHT30</th>
        <th>DHT12</th>
    </tr>
    </thead>
    <tbody>
        <tr>
            <td>Max temperature measuring range</td>
            <td>-40 ~ 120 ℃</td>
            <td>-20 ~ 60 ℃</td>
        </tr>
        <tr>
            <td>Typical temperature resolution</td>
            <td>0 ~ 60 ℃/±0.2℃</td>
            <td>±0.2℃</td>
        </tr>
        <tr>
            <td>Humidity measuring range/resolution</td>
            <td>10 ~ 90 %RH / ±2%</td>
            <td>20 ~ 95 %RH/0.1%</td>
        </tr>
     </tbody>
</table>

## EasyLoader

>EasyLoader is a concise and fast program writer, which has a built-in case program related to the product. It can be burned to the main control by simple steps to perform a series of function verification. Please install the corresponding driver according to the device type. M5Core host [Please click here to view the CP210X driver installation tutorial](en/arduino/arduino_development), M5StickC/V/T/ATOM series can be used without driver)

<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>Description:</p>
            <p>Display temperature, humidity and atmospheric pressure data.</p>
        </div>
    </div>
</div>

### PinMap

<table>
 <tr><td>M5Core(GROVE 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>

## Related Link

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

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

## Schematic

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

## Example

?>This case uses ENVII Unit to read temperature, humidity, and atmospheric pressure data. Please select the corresponding case program below according to the equipment you are using.

<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>

>Note: 1. Please install [Adafruit BMP280 Library](https://github.com/adafruit/Adafruit_BMP280_Library) before compiling the program

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

Adafruit_BMP280.h - API

  float readPressure(void);

```

### 2. UIFlow

- [Click here to download the UIFlow example](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Unit/ENVII/UIFlow)

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

<el-divider content-position="right">Last updated: 2020-12-11</el-divider>

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