m5-docs/docs/en/module/faces_calculator.md

# Calculator {docsify-ignore-all}

<el-tag effect="plain">SKU:A005</el-tag>

<div class="product_pic"><img src="assets/img/product_pics/module/faces_cal/face_cal.webp"></div>

## Description

**Calculator** is a complete featured calculator panel adapted to the FACE_BOTTOM product which can be used for mathematical calculations or custom key operations.

The panel based upon a 4 * 5 button layout design, which covers the basic function buttons required for mathematical calculations. You can also remap them to custom function buttons by modifying the firmware. The panel integrates **MEGA328** processor and communicates via I2C protocol (with default address: 0x08), by default it works in slave mode.

## Product Features

- I2C communication(0X08)
- Numeric keyboard input
- Development Platform [UIFlow](http://flow.m5stack.com), [MicroPython](http://micropython.org/), [Arduino](http://www.arduino.cc)

## Include

- 1x Calculator panel

## Applications

- Data Entry
- Calculator
- Human-computer interaction

## Specification

<table>
   <tr style="font-weight:bold">
      <td>Resources</td>
      <td>Parameter</td>
   </tr>
   <tr>
      <td>Communication</td>
      <td>I2C(0X08)</td>
   </tr>
   <tr>
      <td>Button</td>
      <td>20 button</td>
   </tr>
   <tr>
      <td>Net weight</td>
      <td>20g</td>
   </tr>
   <tr>
      <td>Gross weight</td>
      <td>40g</td>
   </tr>
   <tr>
      <td>Product Size</td>
      <td>58.2mm x 54.2mm x 10.4mm</td>
   </tr>
   <tr>
      <td>Package Size</td>
      <td>95mm x 65mm x 25mm</td>
   </tr>
   <tr>
      <td>Case Material</td>
      <td>Plastic ( PC )</td>
   </tr>
</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/CORE/EasyLoader_FACES_FactoryTest.exe">Windows</a>
            <a href="https://m5stack.oss-cn-shenzhen.aliyuncs.com/EasyLoader/MacOS/CORE/EasyLoader_FACES_FactoryTest.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/Core/FACES.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>This case will run the FACES keyboard input test program by default. Restart the selected program list to switch between different panel test items.</p>
        </div>
    </div>
</div>

## PinMap

**Mega328 ISP** Download interface pin definition

<img src="assets\img\product_pics\app\mega328_isp.webp" width="30%" height="30%">

## Related Link

- [Ateml328P firmware](https://github.com/m5stack/FACES-Firmware/blob/master/Calculator.ino)

## Schematic

### Calculator

<img src="assets\img\product_pics\core\faces_kit\Faces_calculator_sch.webp" width="70%">

## Example

### ArduinoIDE

- Click [Here](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Module/CALCULATOR)to get Arduino example

<el-divider content-position="right">Last updated: 2020-12-28</el-divider>

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