esp32s3 led

### ESP32-S3 控制 LED 示例代码及教程

#### 使用 ESP-IDF 驱动 RGB-LED 的硬件连接
对于 ESP32-S3-DevKitC-1 开发板，其内置 Wi-Fi 和 Bluetooth® LE 模组 ESP32-S3-WROOM-1 可用于驱动外部设备如 RGB-LED。为了实现这一功能，在硬件电路设计上需考虑将 RGB-LED 的各颜色通道分别连接到开发板上的 GPIO 引脚[^1]。

// C code using ESP-IDF framework to control an RGB LED connected via PWM channels.
#include "driver/ledc.h"

#define RED_CHANNEL    LEDC_CHANNEL_0
#define GREEN_CHANNEL  LEDC_CHANNEL_1
#define BLUE_CHANNEL   LEDC_CHANNEL_2
#define LEDC_GPIO_RED  18
#define LEDC_GPIO_GREEN 19
#define LEDC_GPIO_BLUE 21

void setup_rgb_led() {
    ledc_timer_config_t timer_conf = {
        .speed_mode       = LEDC_LOW_SPEED_MODE,
        .duty_resolution  = LEDC_TIMER_13_BIT, // Resolution of PWM duty
        .timer_num        = LEDC_TIMER_0,
        .freq_hz          = 5000,              // Frequency of PWM signal
        .clk_cfg          = LEDC_AUTO_CLK      // Clock source configuration
    };
    
    ledc_channel_config_t red_channel_conf = {
        .gpio_num       = LEDC_GPIO_RED,
        .speed_mode     = LEDC_LOW_SPEED_MODE,
        .channel        = RED_CHANNEL,
        .intr_type      = LEDC_INTR_DISABLE,
        .timer_sel      = LEDC_TIMER_0,
        .duty           = 0,                    // Initial duty cycle value (off state)
        .hpoint         = 0                     // No special phase shift required here
    };

    /* Similar configurations apply for green and blue channels */
}

#### 基于 MicroPython 的简单 LED 控制方法
当采用 MicroPython 进行编程时，则可以更简便地完成对单色或多色 LED 的控制操作。只需安装好对应的固件之后就可以通过简单的命令来改变指定引脚的状态从而点亮或熄灭 LED 灯泡[^2]。

from machine import Pin

# Define the pin where your simple LED is connected
led_pin_number = 2  # Example GPIO number; adjust as necessary based on hardware design.

def turn_on():
    """Turns ON a single-color LED."""
    p = Pin(led_pin_number, Pin.OUT)
    p.value(1)

def turn_off():
    """Turns OFF a single-color LED."""
    p = Pin(led_pin_number, Pin.OUT)
    p.value(0)