【NUCLEO-WB09KE评测】5、微信小程序BLE调节LD3亮度
<p><span style="font-size:18px;">目标</span></p><p> 开发微信小程序建立蓝牙主机访问WB09KE蓝牙从机,发送调节参数PWM调整LD3(PB2)亮度</p>
<p> </p>
<p><span style="font-size:16px;"><strong>一、WB09KE端</strong></span></p>
<p>1、关于PWM调节LED亮度,请参见:<a href="https://bbs.eeworld.com.cn/thread-1294722-1-1.html" target="_blank">https://bbs.eeworld.com.cn/thread-1294722-1-1.html</a></p>
<p>2、</p>
<div></div>
<p>只建了一个GATT服务和特征值,并且特征值是可以写入,1个BYTE</p>
<p> </p>
<p>3、BLE调节LD3亮度</p>
<p>接收到LED_SERVICE_LED_TOGGLE_WRITE_EVT后,通过*p_Notification->DataTransfered.p_Payload获得写入特征值,并将此值给PWM调节占空比。</p>
<pre>
<code class="language-cpp"> case LED_SERVICE_LED_TOGGLE_WRITE_EVT:
/* USER CODE BEGIN Service1Char1_WRITE_EVT */
TIM_SetTIM2Compare3(*p_Notification->DataTransfered.p_Payload);
APP_DBG_MSG("LED_SERVICE_LED_TOGGLE_WRITE_EVT\r\n");
/* USER CODE END Service1Char1_WRITE_EVT */
break;</code></pre>
<pre>
<code class="language-cpp">//设置 TIM 通道 3 的占空比
//compare:比较值
void TIM_SetTIM2Compare3(uint32_t compare)
{
//TIM2->CCR3=compare;
__HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_3, compare); // compare为新的占空比值
}</code></pre>
<p><span style="font-size:16px;"><strong>二、微信小程序端</strong></span></p>
<p>1、将涉及BLE的功能建立了一个自定义组件</p>
<div style="text-align: center;"></div>
<div>index.js</div>
<div> </div>
<div>主要的思路是1、扫描蓝牙;2、连接自建蓝牙从机,连接成功后所有连接参数将可以直接用到下一步;3、通过writeBLECharacteristicValue1()发送0-255的数字。</div>
<div>
<pre>
<code class="language-javascript">// components/bluetooth-comp/index.js
function inArray(arr, key, val) {
for (let i = 0; i < arr.length; i++) {
if (arr === val) {
return i;
}
}
return -1;
}
// 将字符串转为 ArrayBuffer
function str2ab(str) {
let buf = new ArrayBuffer(str.length);
let bufView = new Uint8Array(buf);
for (var i = 0, strLen = str.length; i < strLen; i++) {
bufView = str.charCodeAt(i);
}
return buf;
}
function intToArrayBuffer(int) {
// 将整数转换为十六进制字符串
let hexStr = int.toString(16);
// 计算需要的字节数,如果十六进制字符串长度为奇数,需要补0以确保字节对齐
let byteLength = (hexStr.length + (hexStr.length % 2 === 0 ? 0 : 2)) / 2;
// 创建一个与计算出的字节长度相同的新的ArrayBuffer对象
let buffer = new ArrayBuffer(byteLength);
let dataView = new DataView(buffer);
// 将十六进制字符串中的每个字节转换为无符号8位整数,并写入到ArrayBuffer中
for (let i = 0; i < hexStr.length; i += 2) {
let byte = parseInt(hexStr.substr(i, 2), 16); // 将每两个字符转换为一个字节的整数
dataView.setUint8(i / 2, byte); // 将整数写入ArrayBuffer的适当位置(注意这里假设了整数是按大端序排列的)
}
return buffer; // 返回生成的ArrayBuffer对象
}
Component({
behaviors: ['wx://component-export'],
/**
* 组件的属性列表
*/
properties: {
},
/**
* 组件的初始数据
*/
// bluetooth-comp/index.js
data:{
devices: [],
connected: false,
chs: []
},
/**
* 组件的方法列表
*/
// bluetooth-comp/index.js
methods: {
/* 初始化蓝牙模块 */
openBluetoothAdapter() {
// 先关闭蓝牙模块再开启 防止断开后点连接连接不上
this.closeBluetoothAdapter();
wx.openBluetoothAdapter({
success: response => {
console.log("初始化蓝牙模块成功:openBluetoothAdapter", response);
this.startBluetoothDevicesDiscovery();
},
fail: err => {
if (err.errCode === 10001) {
/* 监听蓝牙适配器状态变化事件 */
wx.onBluetoothAdapterStateChange(res => {
console.log("监听蓝牙适配器状态变化事件:onBluetoothAdapterStateChange", res);
res.available && this.startBluetoothDevicesDiscovery();
});
}
},
});
},
/* 获取本机蓝牙适配器状态 */
getBluetoothAdapterState() {
wx.getBluetoothAdapterState({
success: res => {
console.log("getBluetoothAdapterState", res);
if (res.discovering) {
// 是否正在搜索设备
this.onBluetoothDeviceFound();
} else if (res.available) {
// 蓝牙适配器是否可用
this.startBluetoothDevicesDiscovery();
}
},
});
},
/* 开始搜寻附近的蓝牙外围设备 */
startBluetoothDevicesDiscovery() {
// 开始扫描参数
if (this._discoveryStarted) return;
this._discoveryStarted = true;
wx.startBluetoothDevicesDiscovery({
allowDuplicatesKey: true,
success: response => {
console.log("开始搜寻附近的蓝牙外围设备:startBluetoothDevicesDiscovery", response);
this.onBluetoothDeviceFound();
},
fail: err => {
console.log("搜索设备失败", err);
wx.showToast({ title: "搜索设备失败", icon: "none" });
},
});
},
/* 停止搜寻附近的蓝牙外围设备。*/
stopBluetoothDevicesDiscovery() {
console.log("停止搜寻附近的蓝牙外围设备");
wx.stopBluetoothDevicesDiscovery();
},
/* 监听搜索到新设备的事件 */
onBluetoothDeviceFound() {
wx.onBluetoothDeviceFound(res => {
res.devices.forEach(device => {
if (!device.name && !device.localName) {
return;
}
const foundDevices = this.data.devices;
const idx = inArray(foundDevices, "deviceId", device.deviceId);
const data = {};
if (idx === -1) {
data[`devices[${foundDevices.length}]`] = device;
} else {
data[`devices[${idx}]`] = device;
}
this.setData(data);
});
});
},
/* 连接蓝牙低功耗设备。*/
createBLEConnection(e) {
const ds = e.currentTarget.dataset;
const deviceId = ds.deviceId;
const name = ds.name;
wx.createBLEConnection({
deviceId,
success: () => {
this.setData({ connected: true, name, deviceId });
wx.showToast({ title: "连接蓝牙设备成功", icon: "none" });
this.getBLEDeviceServices(deviceId);
},
fail: e => {
console.log("连接失败", e.errMsg);
wx.showToast({ title: "连接失败,错误信息: " + e.errMsg, icon: "none" });
},
});
// 停止搜寻蓝牙设备
this.stopBluetoothDevicesDiscovery();
},
/* 断开与蓝牙低功耗设备的连接。 */
closeBLEConnection() {
console.log("断开与蓝牙低功耗设备的连接");
wx.showToast({ title: "已断开和蓝牙设备的连接", icon: "none" });
wx.closeBLEConnection({ deviceId: this.data.deviceId });
this.setData({ connected: false, chs: [], canWrite: false });
},
/* 获取蓝牙低功耗设备所有服务 (service) */
getBLEDeviceServices(deviceId) {
wx.getBLEDeviceServices({
deviceId,
success: res => {
for (let i = 0; i < res.services.length; i++) {
if (res.services.isPrimary) {
this.getBLEDeviceCharacteristics(deviceId, res.services.uuid);
return;
}
}
},
});
},
/* 获取蓝牙低功耗设备某个服务中所有特征 (characteristic)。 */
getBLEDeviceCharacteristics(deviceId, serviceId) {
wx.getBLEDeviceCharacteristics({
deviceId,
serviceId,
success: res => {
console.log("获取蓝牙低功耗设备某个服务中所有特征:getBLEDeviceCharacteristics");
for (let i = 0; i < res.characteristics.length; i++) {
let item = res.characteristics;
if (item.properties.read) {
wx.readBLECharacteristicValue({ deviceId, serviceId, characteristicId: item.uuid });
}
if (item.properties.write) {
this.setData({ canWrite: true });
this._deviceId = deviceId;
this._serviceId = serviceId;
this._characteristicId = item.uuid;
// this.writeBLECharacteristicValue();
}
if (item.properties.notify || item.properties.indicate) {
wx.notifyBLECharacteristicValueChange({
deviceId,
serviceId,
characteristicId: item.uuid,
state: true,
success(res) {
console.log("notifyBLECharacteristicValueChange success", res);
},
});
}
}
},
fail(res) {
console.error("getBLEDeviceCharacteristics", res);
},
});
// 操作之前先监听,保证第一时间获取数据
wx.onBLECharacteristicValueChange(characteristic => {
// TODO 收到的信息为ArrayBuffer类型,可根据自己的需要转换 可发送给父组件用来回显
console.log("收到原始的数据", characteristic, characteristic.value);
// 测试向设备发送数据
// this.writeBLECharacteristicValue(JSON.stringify({"FAN":"OFF"}))
});
},
/* 向蓝牙低功耗设备特征值中写入二进制数据 */
writeBLECharacteristicValue(jsonStr) {
let arrayBufferValue = str2ab(jsonStr);
console.log("发送数据给蓝牙", "原始字符串", jsonStr, "转换arrayBuffer", arrayBufferValue);
wx.writeBLECharacteristicValue({
deviceId: this._deviceId,
serviceId: this._serviceId, // 微信文档上是错误的
characteristicId: this._characteristicId,
value: arrayBufferValue, // 只能发送arrayBuffer类型数据
success(res) {
console.log("消息发送成功", res.errMsg);
wx.showToast({ title: "消息发送成功", icon: "none" });
},
fail(e) {i
console.log("发送消息失败", e);i
wx.showToast({ title: "发送消息失败,错误信息: " + e.errMsg, icon: "none" });
},
});
},
/* 向蓝牙低功耗设备特征值中写入十进制数据 */
writeBLECharacteristicValue1(i) {
let arrayBufferValue = intToArrayBuffer(i);
console.log("发送数据给蓝牙", "原始字符串", i, "转换arrayBuffer", arrayBufferValue);
wx.writeBLECharacteristicValue({
deviceId: this._deviceId,
serviceId: this._serviceId, // 微信文档上是错误的
characteristicId: this._characteristicId,
value: arrayBufferValue, // 只能发送arrayBuffer类型数据
success(res) {
console.log("消息发送成功", res.errMsg);
wx.showToast({ title: "消息发送成功", icon: "none" });
},
fail(e) {
console.log("发送消息失败", e);
wx.showToast({ title: "发送消息失败,错误信息: " + e.errMsg, icon: "none" });
},
});
},
closeBluetoothAdapter() {
console.log("关闭蓝牙模块");
wx.closeBluetoothAdapter();
this._discoveryStarted = false;
},
}
})</code></pre>
<p>index.json:</p>
<pre>
<code class="language-javascript">{
"component": true,
"usingComponents": {}
}</code></pre>
<p>index.wxml</p>
<pre>
<code class="language-javascript">createBLEConnection<!-- bluetooth-comp/index.wxml -->
<view style="margin: 26rpx">
<button wx:if="{{!connected}}" bindtap="openBluetoothAdapter">开始扫描</button>
<button wx:else bindtap="closeBLEConnection">断开连接 - {{name}}</button>
<view class="devices_summary">已发现 {{devices.length}} 个外围设备:</view>
<view
wx:for="{{devices}}"
wx:key="index"
data-device-id="{{item.deviceId}}"
data-name="{{item.name || item.localName}}"
bindtap="createBLEConnection"
class="device_item"
hover-class="device_item_hover">
<view style="font-size: 16px; color: #333">{{item.name}}</view>
<view style="font-size: 10px">信号强度: {{item.RSSI}}dBm</view>
<view style="font-size: 10px">UUID: {{item.deviceId}}</view>
<view style="font-size: 10px">localName: {{item.localName}}</view>
</view>
</view></code></pre>
<p>index.wxss:</p>
<pre>
<code class="language-javascript">/* bluetooth-comp/index.wxss */
.devices_summary {
/* margin-top: 30px; */
padding: 10px;
font-size: 16px;
}
.device_item {
border-bottom: 1px solid #eee;
padding: 10px;
color: #666;
}
.device_item_hover {
background-color: rgba(0, 0, 0, 0.1);
}</code></pre>
<p>2、主程序</p>
<p>*.json中引入组件</p>
<pre>
<code class="language-javascript">{
"usingComponents": {
"bluetoothcomp":"/components/bluetooth-comp/index"
}
}</code></pre>
<p>*.wxml外观</p>
<pre>
<code class="language-javascript"><!--pages/wifi.wxml-->
<!--
<view style="position: inherit; width: 100%; background: #d3d3d3; height: auto; left: 0rpx; top: inherit">
<icon type="success" size="40" style="position: relative; left: 31rpx; top: 6rpx"></icon>
<text style="position: relative; left: 85rpx; top: -14rpx">蓝牙</text>
<switch style="position: relative; left: 449rpx; top: -19rpx" checked="{{isBlueTooth}}" bindchange="openDialogBluetooth" />
</view>
-->
<!--bind:close="onCloseBlueTooth"-->
<view>
<bluetoothcomp id="bluetoothid"></bluetoothcomp>
</view>
<view>
<slider bindchange="slider1change" min="0" max="255" show-value="true" left-icon="cancel" right-icon="success_no_circle"/>
<text style="position: relative; left: 303rpx; top: 20rpx" >{{slidervalue}}</text>
</view>
<image style="position: relative; left: 47rpx; top: 354rpx" src="/images/wb09.jpg"/>
</code></pre>
<p>*.js控制部分</p>
<pre>
<code class="language-javascript">// pages/wifi.js
Page({
/**
* 页面的初始数据
*/
data: {
isBlueTooth:false,
bluetoothDialog:false,
slidervalue:0,
},
/**
* 生命周期函数--监听页面加载
*/
onLoad(options) {
},
/**
* 生命周期函数--监听页面初次渲染完成
*/
onReady() {
this.bluetoothcomp = this.selectComponent("#bluetoothid");
},
/**
* 生命周期函数--监听页面显示
*/
onShow() {
},
/**
* 生命周期函数--监听页面隐藏
*/
onHide() {
},
/**
* 生命周期函数--监听页面卸载
*/
onUnload() {
},
/**
* 页面相关事件处理函数--监听用户下拉动作
*/
onPullDownRefresh() {
},
/**
* 页面上拉触底事件的处理函数
*/
onReachBottom() {
},
/**
* 用户点击右上角分享
*/
onShareAppMessage() {
},
bluetoothChange(){
},
openDialogBluetooth(){
this.setData({bluetoothDialog:true});
},
onCloseBlueTooth(){
this.setData({bluetoothDialog:false});
},
slider1change: function(e) {
// e.detail.value 包含了当前slider的value值
this.setData({slidervalue:e.detail.value});
console.log('Slider value changed to:', this.data.slidervalue);
// 在这里你可以对获取到的value值进行进一步的处理或更新数据模型中的值
this.bluetoothcomp.writeBLECharacteristicValue1(this.data.slidervalue);
},
})</code></pre>
<p> </p>
</div>
<p> </p>
<p><strong>三、效果</strong></p>
<p>1、小程序外观</p>
<div style="text-align: center;"></div>
<div>2、运行演示</div>
<div> </div>
<p>ca8e053f2eefc519e5e0671fe042701a<br />
</p>
<p>微信小程序可以直接蓝牙连接吗?不是通过wifi吗? </p>
秦天qintian0303 发表于 2024-9-28 13:44
微信小程序可以直接蓝牙连接吗?不是通过wifi吗?
<p>好像是可以的,我这边的一个客户就是通过这个方式去连接蓝牙终端的</p>
<p>牛的老哥,小程序666</p>
大佬,可以分享一下您的小程源码吗? lugl4313820 发表于 2024-11-2 21:57
大佬,可以分享一下您的小程源码吗?
<p>建议参考微信官方的资料,很详细:</p>
<p>https://developers.weixin.qq.com/miniprogram/dev/framework/device/ble.html</p>
<p> </p>
<p>有些UP主在bilibili上也有视频说明。</p>
<p>https://esp-document.icce.top/%E5%B0%8F%E7%A8%8B%E5%BA%8F%E5%BC%80%E5%8F%91/18%E3%80%81%E5%B0%8F%E7%A8%8B%E5%BA%8F%E5%A2%9E%E5%8A%A0%E8%93%9D%E7%89%99%E9%80%9A%E4%BF%A1%E5%8A%9F%E8%83%BD.html</p>
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