添加智能灯固件代码

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

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+| Supported Targets | ESP32 |
+| ----------------- | ----- |
+
+# ADC1 Example
+
+(See the README.md file in the upper level 'examples' directory for more information about examples.)
+
+This example shows how to configure ADC1 and read the voltage connected to GPIO pin.
+
+## 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
+
+In this example, we use `ADC_UNIT_1` by default, we need to connect a voltage source (0 ~ 3.3v) to GPIO34. If another ADC unit is selected in your application, you need to change the GPIO pin (please refer to Chapter 4.11 of the `ESP32 Technical Reference Manual`).
+
+### 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 the following log output on the serial monitor:
+
+```
+Raw: 486	Voltage: 189mV
+Raw: 435	Voltage: 177mV
+Raw: 225	Voltage: 128mV
+Raw: 18	    Voltage: 79mV
+```
+
+## Troubleshooting
+
+* program upload failure
+
+    * 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.