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一个基于ESP32S3和INMP441麦克风实现音频强度控制RGB灯带律动的代码及效果展示

news 2025/9/10 5:38:59

一个基于ESP32S3和INMP441麦克风实现音频强度控制RGB灯带律动的代码示例，使用Arduino语言：

硬件连接

INMP441 VCC → ESP32的3.3V
INMP441 GND → ESP32的GND
INMP441 SCK → ESP32的GPIO 17
INMP441 WS → ESP32的GPIO 18
INMP441 SD → ESP32的GPIO 16
RGB LED灯带 → ESP32的GPIO 2

代码示例

#include <Arduino.h>
#include <driver/i2s.h>
#include <Adafruit_NeoPixel.h>  // RGB灯带库// 定义I2S引脚
#define I2S_WS 18
#define I2S_SD 16
#define I2S_SCK 17
#define I2S_LED_BCK I2S_SCK
#define I2S_LED_WS I2S_WS
#define I2S_LED_SD I2S_SD
#define I2S_PORT I2S_NUM_0
// 灯带定义
#define LED_PIN    2       // 灯带连接的GPIO引脚
#define LED_COUNT  30     // 灯带LED数量Adafruit_NeoPixel pixels(LED_COUNT, LED_PIN, NEO_RGB + NEO_KHZ800);  // 初始化灯带// I2S配置
const i2s_port_t i2s_port = I2S_PORT;  // 使用I2S端口0
#define I2S_SAMPLE_RATE (48000)        // 采样率
#define I2S_DMA_BUF_LEN (100)          // DMA缓冲区长度
#define I2S_DMA_BUF_CNT (16)           // DMA缓冲区计数// 变量声明
int16_t audioBuffer[100];  // 音频缓冲区
uint32_t audioStrength = 0;  // 音频强度// 初始化I2S
void initI2S() {i2s_config_t i2s_config = {.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),.sample_rate = I2S_SAMPLE_RATE,.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,.communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_I2S_MSB),.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,.dma_buf_count = I2S_DMA_BUF_CNT,.dma_buf_len = I2S_DMA_BUF_LEN,.use_apll = false,.tx_desc_auto_clear = false,.fixed_mclk = 0};i2s_pin_config_t pin_config = {.bck_io_num = I2S_LED_BCK,.ws_io_num = I2S_LED_WS,.data_out_num = I2S_PIN_NO_CHANGE,.data_in_num = I2S_LED_SD};i2s_driver_install(i2s_port, &i2s_config, 0, NULL);i2s_set_pin(i2s_port, &pin_config);i2s_start(i2s_port);
}// 获取音频强度
void getAudioStrength() {size_t bytes_read;i2s_read(i2s_port, (void*)&audioBuffer, 50 * sizeof(int16_t), &bytes_read, portMAX_DELAY);// 计算音频强度audioStrength = 0;for (size_t i = 0; i < 50; i++) {audioStrength += abs(audioBuffer[i]);}audioStrength /= 50;  // 取平均值
}// 控制灯带根据音频强度律动
void controlPixels() {static uint32_t lastUpdate = 0;uint32_t currentMillis = millis();// 每100毫秒更新一次if (currentMillis - lastUpdate >= 1) {lastUpdate = currentMillis;getAudioStrength();  // 获取音频强度// 根据音频强度点亮灯带for (int i = 0; i < LED_COUNT; i++) {if (i < (audioStrength / 20)) {  // 根据音频强度调整点亮范围//pixels.setPixelColor(i, pixels.Color(255, 0, 0));  // 红色// 设置所有LED为彩虹色uint8_t r, g, b;// 计算当前LED在颜色轮盘中的位置int wheelPos = (i * 256 / pixels.numPixels()); // 获得0-255的值Wheel(wheelPos, r, g, b); // 转换为RGB值pixels.setPixelColor(i, pixels.Color(r, g, b)); // 设置颜色} else {pixels.setPixelColor(i, pixels.Color(0, 0, 0));  // 关闭}}pixels.show();  // 更新灯带}
}// Wheel函数根据颜色轮盘的位置返回对应的颜色
void Wheel(byte pos, byte &r, byte &g, byte &b) {if (pos < 85) {r = 255 - pos * 3;g = pos * 3;b = 0;} else if (pos < 170) {pos -= 85;r = 0;g = 255 - pos * 3;b = pos * 3;} else {pos -= 170;r = pos * 3;g = 0;b = 255 - pos * 3;}
}void setup() {Serial.begin(115200);pixels.begin();  // 初始化灯带initI2S();  // 初始化I2S
}void loop() {controlPixels();  // 控制灯带律动
}