# 四按键模块

## 概述

四按键模块通过AD采样实现的 ，只能接在模拟口。每个按键对应一个AD采样值（不同的输出电压值），从而实现不同按键的判别。

## 参数

* 尺寸：48x24mm
* 工作电压：+3.3-5V
* 接口类型：XH2.54mm-3P
* 引脚定义：1-地 2-电源 3-信号

## 接口说明

* 可用端口：2、3、4、9、10、11、12、13、A0、A1、A2、A3

## 使用方式

![](/files/-LWVPVZiVq8NsMlaSPnh)

## 示例代码

![](/files/-LWVPVZnFCqMH5W9HGvB)

![](/files/-LWVPVZpmA42o4Rde1P_)

[四按键模块示例代码](http://www.haohaodada.com/show.php?id=955490)

## 原理图

{% file src="/files/-LrD64UkQktdWpC-KLBo" %}
四按键模块原理图
{% endfile %}

## 尺寸说明

![](/files/-LWVPVZrV-K4lTNoPkbO)

## 常见问题


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