添加智能灯固件代码

firmware/esp-idf/wumei-smart-firmware/examples/peripherals/ledc/README.md

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+# _LEDC Example_
+
+(See the README.md file in the upper level 'examples' directory for more information about examples.)
+
+This example shows how to control intensity of LEDs using ESP32's on-board hardware LED PWM Controller module.
+
+## How to use example
+
+### Hardware Required
+
+* A development board with ESP32 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.)
+* A USB cable for power supply and programming
+
+Connect four LEDs to the following LEDC channels / individual GPIOs:
+
+|ledc channel|GPIO|
+|:---:|:---:|
+|channel 0|GPIO18|
+|channel 1|GPIO19|
+|channel 2|GPIO4|
+|channel 3|GPIO5|
+
+### Configure the project
+
+```
+idf.py menuconfig
+```
+
+### Build and Flash
+
+Build the project and flash it to the board, then run monitor tool to view serial output:
+
+```
+idf.py -p PORT flash monitor
+```
+
+(To exit the serial monitor, type ``Ctrl-]``.)
+
+See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
+
+## Example Output
+
+Running this example, you will see each ledc's brightness changes differently
+
+* LEDC 1: Fade up / increase intensity
+* LEDC 2: Fade down / decrease intensity
+* LEDC 3: Keep a stable intensity
+* LEDC 4: LED is not on
+
+you can also see the following output log on the serial monitor:
+
+```
+1. LEDC fade up to duty = 4000
+2. LEDC fade down to duty = 0
+3. LEDC set duty = 4000 without fade
+4. LEDC set duty = 0 without fade
+...
+```
+
+## Troubleshooting
+
+* Programming fail
+
+    * Hardware connection is not correct: run `idf.py -p PORT monitor`, and reboot your board to see if there are any output logs.
+    * The baud rate for downloading is too high: lower your baud rate in the `menuconfig` menu, and try again.
+
+For any technical queries, please open an [issue] (https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.