语音控制家电：Google Assistant + 蓝牙 + Arduino UNO

组件与材料

所需工具

• 热熔胶枪、电烙铁

软件与服务

• 自制 Android App（集成 Google Assistant 语音触发）

项目背景

市面上多数语音家电方案基于 WiFi，本项目采用蓝牙 + Google Assistant “OK Google” 热词唤醒，无需按键即可语音控制，解决了蓝牙方案需点按 App 按钮的痛点。

系统框图

电路接线

• 继电器 IN1-IN4 → Arduino D8-D11
• HC-05 TX→RX (D0), RX→TX (D1)，VCC/GND 共地
• 继电器模块低电平触发，初始化设 HIGH 关闭负载

Arduino 代码

String voice;
#define FAN 10
#define TUBELIGHT 9
#define BULB 8

void setup() {
  Serial.begin(9600);
  pinMode(FAN, OUTPUT);
  pinMode(TUBELIGHT, OUTPUT);
  pinMode(BULB, OUTPUT);
  analogWrite(TUBELIGHT, 255); // 灭
  analogWrite(FAN, 255);       // 灭
  digitalWrite(BULB, HIGH);    // 灭
}

void loop() {
  while (Serial.available()) {
    delay(10);
    char c = Serial.read();
    if (c == '#') break;
    voice += c;
  }
  if (voice.length() > 0) {
    Serial.println(voice);
    if (voice == "tubelight") { analogWrite(TUBELIGHT, 0); analogWrite(FAN, 255); digitalWrite(BULB, HIGH); }
    else if (voice == "green") { analogWrite(TUBELIGHT, 255); analogWrite(FAN, 255); digitalWrite(BULB, HIGH); }
    else if (voice == "fan") { analogWrite(TUBELIGHT, 255); analogWrite(FAN, 0); digitalWrite(BULB, HIGH); }
    else if (voice == "bulb") { analogWrite(TUBELIGHT, 0); analogWrite(FAN, 255); digitalWrite(BULB, LOW); }
    else if (voice == "go") { digitalWrite(BULB, HIGH); }
    else if (voice == "lights") { analogWrite(TUBELIGHT, 0); analogWrite(FAN, 0); digitalWrite(BULB, LOW); }
    else if (voice == "good night") { analogWrite(TUBELIGHT, 255); analogWrite(FAN, 255); digitalWrite(BULB, HIGH); }
    voice = "";
  }
}

原理图