1.简介
通过蓝牙通讯 使用手机来控制 单片机 上 LED 灯的亮灭。
1）硬件使用 89c52 单片机
2）BT06 蓝牙模块
3） Android 手机一部
手机 —（蓝牙连接）—> BT06 ----(串口通信)–> 单片机 -----> LED
2.蓝牙模块 硬件连接
蓝牙模块与 51 开发板接线主要有 4 根线需要接，分别为 VCC、GND、TXD、RXD,蓝牙模块上的 VCC 接 到开发板上的 VCC 针脚，蓝牙模块的 GND 接到开发板上的 GND 针脚，蓝牙模块的 TXD 接到开发板上的 P30 针脚，蓝牙模块的 TXD 接到开发板上的 P31 针脚。
单片机上电之后，手机会搜索到 一个蓝牙名称为 “BT04-A” 的蓝牙信号，就是这个蓝牙模块。
3、手机端apk 功能实现
手机端主要是通过蓝牙连接，发送信号给单片机蓝牙模块
- 代码结构
2）AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="myapplication.lum.com.ledcontrol">
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
- activity_mani.xml 布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:layout_width="180dp"
android:layout_height="60dp"
android:id="@+id/connect_id"
android:textSize="30dp"
android:text="连接蓝牙"/>
<Button
android:layout_width="180dp"
android:layout_height="60dp"
android:id="@+id/led_id"
android:textSize="30dp"
android:text="开灯"/>
</LinearLayout>
4） mainActivity.java 功能文件
这里 我知道自己买的蓝牙模块的物理地址 44:44:1B:0F:0D:B8 ，就可以直接手动连接 蓝牙，然后通过 蓝牙物理地址 找到 连接的设备，进而连接socket 等，
package myapplication.lum.com.ledcontrol;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Set;
import java.util.UUID;
import static android.bluetooth.BluetoothProfile.GATT_SERVER;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private String TAG = "LUM: ";
private Button buttonConnect, buttonLed;
private BluetoothAdapter mbluetoothAdapter;
private String bluetoothDeviceMacAddress = "44:44:1B:0F:0D:B8"; //Bluetooth module physical address
private BluetoothDevice bluetoothDevice = null; // Connected Bluetooth device
private BluetoothSocket btSocket = null; // Bluetooth communication socket
private final static String MY_UUID = "00001101-0000-1000-8000-00805F9B34FB"; // SPP service UUID number
private final static int RESULT_CODE = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
mbluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); //get the default bluetooth adapter
buttonConnect = (Button) findViewById(R.id.connect_id);
buttonLed = (Button) findViewById(R.id.led_id);
buttonConnect.setOnClickListener(this);
buttonLed.setOnClickListener(this);
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothDevice.ACTION_FOUND); //Bluetooth search
filter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
filter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
registerReceiver(mReceiver, filter);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.connect_id:
Log.i(TAG, "check link");
//Jump directly to the Bluetooth settings interface
if ("连接蓝牙".equals(buttonConnect.getText().toString())) {
if (!mbluetoothAdapter.isEnabled()){
startActivityForResult(new Intent(Settings.ACTION_BLUETOOTH_SETTINGS), RESULT_CODE);
} else {
connectBtSocket();
}
} else {
disconnect();
}
break;
case R.id.led_id:
Log.i(TAG, "led control");
if (btSocket != null && btSocket.isConnected()) {
if ("开灯".equals(buttonLed.getText().toString())) {
send(1);
buttonLed.setText("关灯");
} else {
send(2);
buttonLed.setText("开灯");
}
}
}
}
public void send(int command) {
try {
if (btSocket != null) {
OutputStream os = btSocket.getOutputStream(); //Bluetooth connection output stream
os.write(command);
} else {
Toast.makeText(this, "请先连接蓝牙", Toast.LENGTH_SHORT).show();
}
} catch (IOException e) {
}
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == RESULT_CODE) {
connectBtSocket();
}
}
private void connectBtSocket() {
// Get the handle of the Bluetooth device
bluetoothDevice = mbluetoothAdapter.getRemoteDevice(bluetoothDeviceMacAddress);
//Turn off scanning before pairing
if (mbluetoothAdapter.isDiscovering()) {
mbluetoothAdapter.cancelDiscovery();
}
// Get the connected socket
try {
btSocket = bluetoothDevice.createRfcommSocketToServiceRecord(UUID
.fromString(MY_UUID));
btSocket.connect(); //Connection socket
} catch (IOException e) {
Toast.makeText(this, "Connection failed, can't get Socket！" + e, Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
if (btSocket.isConnected()) {
Log.i(TAG, "socket connected");
Toast.makeText(this, "connect success", Toast.LENGTH_SHORT).show();
buttonConnect.setText("蓝牙已连接");
} else {
Log.i(TAG, "socket didn't connected");
Toast.makeText(this, "connect failed", Toast.LENGTH_SHORT).show();
}
}
private void disconnect() {
try {
if (btSocket != null) {
btSocket.close();
}
} catch (IOException e) {
}
buttonConnect.setText("连接蓝牙");
}
// Help us find the physical address of the Bluetooth module that needs to be connected
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Log.i(TAG, "Searched Bluetooth device; device name: " + device.getName() + " device address: " + device.getAddress());
}
if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
Log.i(TAG, "ACTION_ACL_CONNECTED");
if (btSocket.isConnected()) {
buttonConnect.setText("蓝牙已连接");
}
}
if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action)) {
Log.i(TAG, "ACTION_ACL_CONNECTED");
if (btSocket.isConnected()) {
buttonConnect.setText("连接蓝牙");
}
}
}
};
public void onDestroy() {
super.onDestroy();
unregisterReceiver(mReceiver);
Log.i(TAG, "Unregister");
}
}
4. 单片机端 程序
#include <reg52.h> //51头文件
sbit LED1 = P1^0; //位定义 LED1硬件接口
void delay(unsigned int z)//毫秒级延时
{
unsigned int x,y;
for(x = z; x > 0; x--)
for(y = 114; y > 0 ; y--);
}
/******************************************************************/
/* 串口中断程序*/
/******************************************************************/
void UART_SER () interrupt 4
{
unsigned int n; //定义临时变量
if(RI) //判断是接收中断产生
{
RI=0; //标志位清零
n=SBUF; //读入缓冲区的值
switch(n)
{
case 1: LED1 = 0; break; //亮灯
case 2: LED1 = 1; break; //灭灯
}
}
}
//蓝牙初始化
void boothint(void)
{
SCON = 0x50; // SCON: 模式1, 8-bit UART, 使能接收
TMOD |= 0x20;
TH1=0xfd; //波特率9600 初值
TL1=0xfd;
TR1= 1;
EA = 1; //开总中断
ES= 1; //打开串口中断
}
void main()
{
boothint();
while(1)
{
}
}
文件参考：
安卓手机与蓝牙模块联合调试（三）—— 单片机蓝牙控制LED灯亮灭（下）
https://blog.csdn.net/u010898329/article/details/82177958
