小程序连接蓝牙设备 发送指令 电量计算

Page({ data: { ShowDlog:false,//是否显示弹框 DeviceList:[],//设配列表 Update:false,//重新连接按钮 intNum:0, time:null, deviceObject:{}, deviceItem:{}, gear:1, Mode:'0x01',//模式 SpeedGear:'0x01',//档位 Status:'0x01'//开始/ 暂停 },

henFun(){ let _self=this; this.setData({ ShowDlog:true }); //初始化蓝牙模块 第一步 wx.openBluetoothAdapter({ success (res) { console.log(res) //蓝牙模块初始化成功 _self.startBluetoothDevicesDiscovery(); }, fail:function (err) { wx.showToast({ title: '蓝牙未开启', icon: 'error', duration: 2000 }); console.log('蓝牙模块初始化失败',err) }

})

}, //开始搜寻附近的蓝牙外围设备 第2步 startBluetoothDevicesDiscovery() { let _self=this; wx.startBluetoothDevicesDiscovery({ allowDuplicatesKey: true, interval:1, success: function(res) { console.log("开始扫描蓝牙设备", res); _self.onBluetoothDeviceFound(); }, fail:function (err) { console.log('开始扫描蓝牙设备err',err)
}, }); }, //监听搜索到新设备的事件 第3步 onBluetoothDeviceFound() { let _self=this; wx.onBluetoothDeviceFound(function(res) { var devices = res.devices; devices.forEach((data,index)=>{ //搜索指定设配 //console.log("监听搜索到新设备的事件", res); if(data.deviceId=='E015B716-649F-10B6-B0CB-1CBBA1A1ECCD'){ console.log("监听搜索到新设备的事件", res); _self.data.DeviceList.push(data); _self.setData({ DeviceList:_self.data.DeviceList }); // 搜索指定设备 就停止搜索 wx.stopBluetoothDevicesDiscovery({ success (res) { clearInterval(_self.data.time); console.log("停止搜寻附近的蓝牙外围设备", res); } }); }; }) }); // //超过指定时间 停止监听和搜索 this.data.time=setInterval(()=>{ this.data.intNum++; console.log(this.data.intNum); if(this.data.intNum>=15){ clearInterval(this.data.time); wx.stopBluetoothDevicesDiscovery({ success (res) { console.log("停止搜寻附近的蓝牙外围设备", res); _self.setData({ Update:true }) } }); }; },1000); }, //连接蓝牙 第4步 connect(event){ let _self=this; console.log(event.detail); _self.createBLEConnection(event) }, //连接蓝牙低功耗设备 获取蓝牙 第5步 createBLEConnection(event) { let _self=this; wx.createBLEConnection({ deviceId:event.detail.deviceId, success: function(res) { wx.showToast({ title: '蓝牙连接成功', icon: 'success', duration: 2000 }); _self.setData({ ShowDlog:false, deviceObject:event.detail }); _self.getBLEDeviceServices(event.detail.deviceId); // console.log("连接蓝牙低功耗设备:", res); } }); }, //获取蓝牙低功耗设备所有服务 (service) 第6步 getBLEDeviceServices(deviceId) { let _self=this; wx.getBLEDeviceServices({ deviceId: deviceId, success: function(res) { console.log("获取蓝牙低功耗设备所有服务:", res); let serve = res.services.find(item=>item.uuid.startsWith('0000FF00')).uuid; //读的 通知服务 UUID： let uuid = res.services.find(item=>item.uuid.startsWith('0000FF10')).uuid; //写入 特征值 UUID _self.getBLEDeviceCharacteristics(deviceId, uuid,serve) } }); }, //获取蓝牙低功耗设备某个服务中所有特征 (characteristic) 第7步 getBLEDeviceCharacteristics(deviceId, uuid,serve) { let _self=this; //写入 获取 特征值 wx.getBLEDeviceCharacteristics({ deviceId: deviceId, serviceId: uuid, success: function(res) { // console.log("特征值:", res.characteristics); let characteristicId = res.characteristics.find(c => c.properties.write).uuid; //写 获取可写的特征值; _self.setData({ deviceItem:{ deviceId:deviceId,//设备id serviceId:uuid,//服务id characteristicId:characteristicId //特征值 } }); _self.writeDataToDevice(deviceId, uuid, characteristicId); } });

//读取 
wx.getBLEDeviceCharacteristics({
  deviceId: deviceId,
  serviceId: serve,
  success: function(res) {
    console.log('获取蓝牙低功耗设备某个服务中所有特征>>>>>>:', res)
    let characteristicId = res.characteristics.find(c => c.properties.notify).uuid;  //读 获取可写的特征值;
      //启用蓝牙低功耗设备特征值变化时的 notify 功能
     wx.notifyBLECharacteristicValueChange({
      state: true, // 启用 notify 功能
      deviceId:deviceId,//这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接
      serviceId:serve, // 这里的 serviceId 需要在 getBLEDeviceServices 接口中获取
      characteristicId:characteristicId,//这里的 characteristicId 需要在 getBLEDeviceCharacteristics 接口中获取
      success (res) {
        console.log('启用蓝牙低功耗设备特征值变化时的 success', res)
        wx.onBLECharacteristicValueChange(function(data) {
          console.log('>>>16',data.value)
          const dataView = new DataView(data.value);
          let reportedVoltage = dataView.getUint8(4); // 获取电压数据
            console.log('reportedVoltage>>>>',reportedVoltage)
          let actualVoltage = reportedVoltage / 10;//  // 换算成实际电压
         // 定义电压阈值
          const maxVoltage = 4.35;
          const minVoltage = 3.0;
          const voltageRange = maxVoltage - minVoltage;

          // 计算电量百分比
          let batteryLevel = ((actualVoltage - minVoltage) / voltageRange) * 100;

          // 保证电量百分比在 0 到 100 之间
          batteryLevel = Math.max(0, Math.min(100, batteryLevel));

          console.log("设备电量:", batteryLevel.toFixed(0) + "%");

        });
      },
      fail(err){
        console.log('启用蓝牙低功耗设备特征值变化时的 err', err)
      }
    });
  }
});

}, /// 向蓝牙低功耗设备特征值中写入二进制数据。注意：必须设备的特征支持 write 才可以成功调用 第8步 writeDataToDevice(deviceId, uuid, characteristicId) {

// //0xDE 0x0A 0x01 0x04 0x00 0x00 0x00 0x01 0x01 0xED 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00  //指令
         //h    //le     //Mode           //SpeedGear档位                                      // 开始/暂停      //End：
let arr=['0xDE', '0x0A', this.data.Mode, this.data.SpeedGear, '0x00', '0x00', '0x00', '0x01', this.data.Status, '0xED', '0x00', '0x00', '0x00', '0x00', '0x00', '0x00', '0x00', '0x00' ,'0x00', '0x00'];
                                   
let buffer = new ArrayBuffer(20);
let dataView = new DataView(buffer);
 for(let i=0;i<arr.length;i++){
//    console.log('.>>>>',i,arr[i])
  dataView.setUint8(i,arr[i]);   
 }
console.log(arr)
  wx.writeBLECharacteristicValue({
  deviceId: deviceId,
  serviceId: uuid,
  characteristicId: characteristicId,
  value: buffer,
  success: function(res) {
    console.log("数据发送成功", res);
  },
  fail: function(err) {
    console.log("数据发送失败", err);
  }
});

},

//减档 minus(){ this.data.gear--; this.setData({ gear:this.data.gear, SpeedGear:'0x0'+this.data.gear

 });

this.writeDataToDevice(this.data.deviceItem.deviceId,this.data.deviceItem.serviceId,this.data.deviceItem.characteristicId) }, //加档 add(){ this.data.gear++; this.setData({ gear:this.data.gear, SpeedGear:'0x0'+this.data.gear }); this.writeDataToDevice(this.data.deviceItem.deviceId,this.data.deviceItem.serviceId,this.data.deviceItem.characteristicId) },

//重新搜索 updatesearch(){ this.setData({ intNum:0, Update:false }); this.henFun() }, //取消按钮 隐藏弹框 concal(){ this.setData({ ShowDlog:false, DeviceList:[], intNum:0 }); }, //断开连接 cones(){ wx.closeBluetoothAdapter({ success (res) { wx.showToast({ title: '断开连接成功', icon: 'error', duration: 2000 }); console.log('断开连接',res) } }) }

})