m5-docs/docs/en/base/btc_base.md

# Base BTC

<el-tag effect="plain">SKU:A011/A011-B</el-tag>

<div class="product_pic"><img src="assets/img/product_pics/base/btc/base_btc_01.webp"></div>

##  Description

**BTC** is a M5 Base that allows you stand your M5 Core instead of laying them down or hang on the wall. BTC is not just a seat for holding the M5 Core but also comes with serveral features like temperature and humiluty detection (by SHT30), and charging base.

**Note:**

- Although M5Stack [BASIC](https://docs.m5stack.com/#/en/core/basic) and [GRAY](https://docs.m5stack.com/#/en/core/gray) Core can be attached to the base, but BTC can not charge them. After plugging-in a USB cable, the Core is powering without any charger.

- Once M5Stack Core has been attached to BTC, it can not connect to an ENV Unit. This is to avoid I2C address conflict with built-in SHT30 sensor of BTC Base.

## Product Features

-  SHT30 inside

## Include

-  Type-C USB Cable
-  M3 x 16
-  Tools
-  BTC Base

<img src="assets/img/product_pics/base/btc/base_btc_02.webp" width="30%">

## Specification

<table>
   <tr style="font-weight:bold">
      <td>Resources</td>
      <td>Parameter</td>
   </tr>
   <tr>
      <td>Net weight</td>
      <td>9g</td>
   </tr>
   <tr>
      <td>Gross weight</td>
      <td>59g</td>
   </tr>
   <tr>
      <td>Product Size</td>
      <td>54*45*20mm</td>
   </tr>
   <tr>
      <td>Package Size</td>
      <td>95*65*25mm</td>
   </tr>
 </table>

## PinMap

**SHT30**

<table>
 <tr><td>ESP32 Chip</td><td>GPIO22</td><td>GND</td><td>GPIO21</td><td>3V3</td></tr>
 <tr><td>SHT30</td><td>SCL</td><td>GND</td><td>SDA</td><td>3V3</td></tr>
</table>


## Related Link

- [DHT12 datasheet](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/hat/DHT12_en.pdf)

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

## Example

### 1. Arduino

[BTC2.1 & SHT30 Example](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Base/BTC/Arduino/BTC2.1)

[BTC & DHT12 Example](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Base/BTC/Arduino/BTC)

## Version Change

<table>
   <thead>
      <tr> 
         <th>Release Date</th>
         <th>Product Change</th>
         <th>Note:</th>
      </tr>
   </thead>    
   <tbody>
      <tr>
         <td>2017.7</td>
         <td>Initial public release</td>
         <td>/</td>
      </tr>
      <tr>
         <td>2020.5</td>
         <td>DHT12 changed to SHT30</td>
         <td>/</td>
      </tr>
   <tbody>
</table>


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