更新按键unit

docs/en/unit/button.md

@@ -10,9 +10,13 @@
 
 **<mark>BUTTON</mark>** is a single momentary push button Unit. It contains one independent "momentary on/off" button. “Momentary” means that the button rebounds on its own after it is released. The button outputs a LOW signal when pressed, and HIGH when released. The Btn stands for signal while NC stands for not used at all.
 
-As shown in the figure below:
+**As shown in the figure below:**
 
-<img src="assets/img/product_pics/unit/button/unit_button_02.png">
+<img src="assets/img/product_pics/unit/button/unit_button_02.png"  width="50%" height="50%">
+
+**Output status:**
+
+<img src="assets/img/product_pics/unit/button/unit_button_03.png">
 
 This unit communicates with M5Core through GROVE B port.
 

docs/en/unit/dual_button.md

@@ -10,8 +10,14 @@
 
 **<mark>Dual Button</mark>** is a unit built-in two momentary push buttons. It contains two independent "momentary on/off" buttons. “Momentary” means that the button rebounds on its own after it is released. The button pressed outputs a LOW signal when pressed, and HIGH when released. The GPIO36 pin outputs the level signal of Button A (blue button), and the GPIO26 (red button) pin outputs the level signal of Button B.
 
+**Output status:**
+
 <img src="assets/img/product_pics/unit/dual_button/unit_dual_button_05.png" width="50%" height="50%">
 
+**Output status:**
+
+<img src="assets/img/product_pics/unit/dual_button/unit_dual_button_08.png">
+
 ## Feature
 
 - GROVE interface, support [UIFlow](http://flow.m5stack.com) and [Arduino](http://www.arduino.cc)

docs/zh_CN/unit/button.md

@@ -10,10 +10,14 @@
 
 **<mark>BUTTON</mark>** 是一个瞬时单按键开关 unit。这个 Unit 内置了一个瞬时按键，这个瞬时按键能够在按压释放时会自动弹回。当按键按下时立即输出一个低电压的逻辑电平，释放时立即输出一个高电压的逻辑平。NC 引脚在该模块没有用到，Btn (GPIO36) 引脚为按钮的信号输出。
 
-如图下图所示：
+**如图下图所示：**
 
 <img src="assets/img/product_pics/unit/button/unit_button_02.png">
 
+**按键输出状态示意：**
+
+<img src="assets/img/product_pics/unit/button/unit_button_03.png">
+
 该 Unit 与 M5Core 通过 Grove B 接口通信。
 
 ## 特性

docs/zh_CN/unit/dual_button.md

@@ -12,6 +12,10 @@
 
 <img src="assets/img/product_pics/unit/dual_button/unit_dual_button_05.png" width="50%" height="50%">
 
+**输出状态示意:**
+
+<img src="assets/img/product_pics/unit/dual_button/unit_dual_button_08.png">
+
 ## 特性
 
 -  GROVE 接口，支持 [UIFlow](http://flow.m5stack.com) 编程，[Arduino](http://www.arduino.cc) 编程