ESP32实现AI问答,调用minmax大模型+百度语音

材料准备

一块ESP32（本文所用为ESP32-S3-N16R8）

一块max98357A（功放模块）+一个喇叭

一块INMP441麦克风模块

一块5V锂电池

一块面包板

项目流程

细致分为十个步骤，如图

主要步骤为：

① 将麦克风录音的音频发送到百度语音智能云平台，调用百度语音识别技术，将音频转换为文字，识别的文字返回给ESP32

②ESP32将文字发送到minmax平台，调用minmax模型获取回答，并将回答以文字形式返回给ESP32

③ESP32将获取的回复内容发送到百度语音智能云平台，调用百度语音合成技术，将文字内容转换为音频，音频返回给ESP32,ESP32将合成的音频通过功放模块放出来

代码连线：

模块引脚说明：

ESP32	MAX98357A
16	LRC
15	BCLK
7	DIN
GND	GND
3.3/5V	VIN

ESP32	INP441
4	SCK
5	WS
6	SD
3.3V	VDD
GND	GND

INP441与MAX98357A未提及部分不需要接线，MAX98357A还需接喇叭，注意正负极，红色为正，黑色为负

开发环境：Arduino IDE

开发板选取：ESP32S3 Dev Module 

流程如下（默认已经有了ESP32环境）

如果说这个方法找不到开发板，还有一种方法，具体流程如下

实现代码：（代码有bug）

#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <driver/i2s.h>
#include <UrlEncode.h>
#include <base64.hpp>
#include <string.h>
#include "cJSON.h"

// I2S config for MAX98357A
#define I2S_OUT_PORT I2S_NUM_1
#define I2S_OUT_BCLK 15
#define I2S_OUT_LRC 16
#define I2S_OUT_DOUT 7

// INMP441 config
#define I2S_IN_PORT I2S_NUM_0
#define I2S_IN_BCLK 4
#define I2S_IN_LRC 5
#define I2S_IN_DIN 6

// WiFi credentials
const char* ssid = "name";
const char* password = "password";

// 2. Replace with your OpenAI API key
const char* apiKey = "*******************";
// Send request to OpenAI API
String apiUrl = "https://api.minimax.chat/v1/text/chatcompletion_v2";

const int STT_DEV_PID = 1537; //选填，输入法模型 1737-英语 1537-普通话(近场识别模型) 1936-普通话远程识别 1837-四川话 
const char *STT_CUID = "*****************8"; //用户唯一标识，用来区分用户，计算UV值。建议填写能区分用户的机器 MAC 地址或 IMEI 码，长度为60字符以内。
const char *STT_CLIENT_ID = "*****************8"; //API Key
const char *STT_CLIENT_SECRET = "*******************"; //Secret Key

// Audio recording settings
#define SAMPLE_RATE 16000
#define RECORD_TIME_SECONDS 15
#define BUFFER_SIZE (SAMPLE_RATE * RECORD_TIME_SECONDS)

/** Audio buffers, pointers and selectors */
typedef struct {
  int16_t* buffer;
  uint8_t buf_ready;
  uint32_t buf_count;
  uint32_t n_samples;
} inference_t;

static inference_t inference;
static const uint32_t sample_buffer_size = 2048;
static signed short sampleBuffer[sample_buffer_size];
static bool debug_nn = false;  // Set this to true to see e.g. features generated from the raw signal
static bool record_status = true;

String getAccessToken(const char* api_key, const char* secret_key) {
  String access_token = "";
  HTTPClient http;

  // 创建http请求
  http.begin("https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=" + String(api_key) + "&client_secret=" + String(secret_key));
  int httpCode = http.POST("");

  if (httpCode == HTTP_CODE_OK) {
    String response = http.getString();
    DynamicJsonDocument doc(1024);
    deserializeJson(doc, response);
    access_token = doc["access_token"].as<String>();

    Serial.printf("[HTTP] GET access_token: %s\n", access_token);
  } else {
    Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
  }
  http.end();

  return access_token;
}

void wifi_setup() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi ..");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print('.');
    delay(1000);
  }
  Serial.println(WiFi.localIP());
  Serial.println("Enter a prompt:");
}

void baiduTTS_Send(String access_token, String text) {
  if (access_token == "") {
    Serial.println("access_token is null");
    return;
  }

  if (text.length() == 0) {
    Serial.println("text is null");
    return;
  }

  const int per = 1;
  const int spd = 6;
  const int pit = 5;
  const int vol = 15;
  const int aue = 6;

  // 进行 URL 编码
  String encodedText = urlEncode(urlEncode(text));

  // URL http请求数据封装
  String url = "https://tsn.baidu.com/text2audio";

  const char* header[] = { "Content-Type", "Content-Length" };

  url += "?tok=" + access_token;
  url += "&tex=" + encodedText;
  url += "&per=" + String(per);
  url += "&spd=" + String(spd);
  url += "&pit=" + String(pit);
  url += "&vol=" + String(vol);
  url += "&aue=" + String(aue);
  url += "&cuid=esp32s3";
  url += "&lan=zh";
  url += "&ctp=1";

  // http请求创建
  HTTPClient http;

  http.begin(url);
  http.collectHeaders(header, 2);

  int httpResponseCode = http.GET();
  if (httpResponseCode > 0) {
    if (httpResponseCode == HTTP_CODE_OK) {
      String c