Update README.md

codelast · codelast · commit 9e75eaf360b1 · 2015-10-31T20:55:44.000+08:00
diff --git a/gpio/led/README.md b/gpio/led/README.md
@@ -3,6 +3,8 @@ Demos on how to:
 * control a LED through a button(pressed or not)
 * control the brightness of a LED through PWM
 
+****
+
 该目录下的程序演示了：
 * 如何用树莓派控制LED闪烁
 * 如何通过一个外部按钮的开关来控制LED的亮灭
