蓝牙串口通信控制Arduino全彩呼吸灯 |
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蓝牙串口通信控制Arduino全彩呼吸灯
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这是我期末的时候做的一个Arduino课程设计，可以通过手机APP来控制呼吸灯亮灭及颜色变化。 主要实验器材：Arduino UNO开发板共阳三色雾状LED灯面包板、普通LED灯、电阻、杜邦线若干HC-05蓝牙模块支持蓝牙功能的Android手机 HC-05蓝牙模块与Arduino连接方式HC-05 VCC ----- Arduino VIN HC-05 GND ----- Arduino GND HC-05 TXD ----- Arduino RXD HC-05 RXD ----- Arduino TXD Android蓝牙模块手机APP连接上HC-05后，在TextView中输入要发送的字符串，定义s、c、f、b分别为小LED灯开、关、和三色彩灯的开、关；通过蓝牙串口将字符串发送出去。 Android蓝牙通信程序关键代码打开蓝牙：// 获取蓝牙适配器 mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); //请求开启蓝牙 if (!mBluetoothAdapter.isEnabled()) { Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); }搜索设备：// 将已配对的设备添加到列表中 Set pairedDevices = mBluetoothAdapter.getBondedDevices(); if (pairedDevices.size() > 0) { for (BluetoothDevice device : pairedDevices) { mDevicesArray.add(device.getName() + "\n" + device.getAddress()); deviceList.add(device); } } // 注册广播接收器，以获取蓝牙设备搜索结果 IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND); registerReceiver(mReceiver, filter); // Don't forget to unregister during onDestroy // 搜索蓝牙设备 mBluetoothAdapter.startDiscovery(); // Create a BroadcastReceiver for ACTION_FOUND private final BroadcastReceiver mReceiver = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { String action = intent.getAction(); // When discovery finds a device if (BluetoothDevice.ACTION_FOUND.equals(action)) { // Get the BluetoothDevice object from the Intent BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); deviceList.add(device); // Add the name and address to an array adapter to show in a ListView mDevicesArray.add(device.getName() + "\n" + device.getAddress()); // Notify ListView to update devicesListAdapter.notifyDataSetChanged(); } } };匹配并建立连接BluetoothSocket socket = null; try { // 蓝牙串口服务对应的UUID。如使用的是其它蓝牙服务，需更改下面的字符串 UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); socket = device.createRfcommSocketToServiceRecord(MY_UUID); } catch (Exception e) { Log.d("log", "获取Socket失败"); return; } try { // Connect the device through the socket. This will block // until it succeeds or throws an exception socket.connect(); Log.d("log", "连接成功"); } catch (IOException connectException) { // Unable to connect; close the socket and get out Log.d("log", "连接失败"); try { socket.close(); } catch (IOException closeException) { } return; }收发数据mmInStream = socket.getInputStream(); mmOutStream = socket.getOutputStream(); //接收数据 byte[] buffer = new byte[1024]; try { bytes = mmInStream.read(buffer); } catch (IOException e) { break; } //发送数据 try { mmOutStream.write(bytes); } catch (IOException e) { }共阳三色雾状LED灯介绍 顾名思义它可以产生三种颜色，分别是红、绿、蓝，也可以同时调整三种颜色的亮度，产生彩色呼吸灯的效果。 系统原理图： Arduino源码：#define small_led 8 //Pin 8 连接上小led灯正极
#define led_red 9 //Pin 9 连接上 led的红色引脚
#define led_green 10 //Pin 10 连接上 led的绿色引脚
#define led_blue 11 //Pin 11 连接上 led的蓝色引脚
void setup() {
Serial.begin(9600); //设置波特率9600
pinMode(small_led, OUTPUT); //设置为输出模式
pinMode(led_red, OUTPUT);
pinMode(led_green, OUTPUT);
pinMode(led_blue, OUTPUT);
analogWrite(small_led, 0); //首先，先把所有的灯都关闭
analogWrite(led_red, 255);
analogWrite(led_green, 255); //可以随意设置开启关闭哪些灯，搭配出不同组合有不同颜色
analogWrite(led_blue, 255);
}
void loop() {
if (Serial.available() > 0)
{
char data = Serial.read();
switch (data)
{
case 's': analogWrite(small_led, 255); break; //小灯亮
case 'c': analogWrite(small_led, 0); break; //小灯灭
case 'f':
for (int i = 200; i > 0; i--) //渐亮
{
analogWrite(led_red, i); //慢慢开启红色和绿色会搭配出黄色
analogWrite(led_green, i);
analogWrite(led_blue, 255);
delay(10);
}
for (int i = 0; i < 200; i++) //渐灭
{
analogWrite(led_red, 255); //慢慢关闭绿色和蓝色会搭配出较鲜艳的蓝色
analogWrite(led_green, i);
analogWrite(led_blue, i);
delay(10);
}
break;
case 'b':
analogWrite(led_red, 255); //关闭呼吸灯
analogWrite(led_green, 255);
analogWrite(led_blue, 255);
break;
}
Serial.println(data);
}
delay(10);
}实际连接图： 注意事项：防止LED灯被烧坏，在接5v电源的同时接上220Ω电阻。在烧录代码的时候要把Arduino的TXD、RXD与HC-05的RXD、TXD断开连接，否则会有干扰，代码烧录不进去。
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