微信小程序蓝牙连接设备
作者：互联网
小程序连接设备蓝牙详细步骤（低功耗蓝牙）
上代码：
WXML
<view>
<view bindtap="initBlue">初始化蓝牙</view>
<view>
匹配到的蓝牙{{consoleLog}}
</view>
<view>高压{{highpressure}}</view>
<view>低压{{lowpressure}}</view>
<view>脉搏{{pulse}}</view>
</view>
WXJS
Page({
data: {
inputValue:'血压名称-设备编号',//血压
deviceId:'',
services:'',
propertiesuuId:"",//监听值
writeId:"",//写入值
uuid:"",
buffer:"",
readvalue:"",
highpressure:"",//高压
lowpressure:"",//低压
pulse:"",//脉搏
},
})
1.0 wx.openBluetoothAdapter 初始化蓝牙模块
initBlue:function(){
var that = this;
wx.openBluetoothAdapter({//调用微信小程序api 打开蓝牙适配器接口
success: function (res) {
console.log(res)
wx.showToast({
title: '初始化成功',
icon: 'success',
duration: 800
})
that.findBlue();//2.0
},
fail: function (res) {//如果手机上的蓝牙没有打开，可以提醒用户
wx.showToast({
title: '请开启蓝牙',
icon: 'fails',
duration: 1000
})
}
})
},
2.0 wx.startBluetoothDevicesDiscovery 开始搜寻附近的蓝牙外围设备
findBlue(){
var that = this
//开始搜索蓝牙
wx.startBluetoothDevicesDiscovery({
allowDuplicatesKey: false,
interval: 0,
success: function (res) {
console.log(res)
wx.showLoading({
title: '正在搜索设备',
})
that.getBlue()//3.0
}
})
},
3.0 wx.getBluetoothDevices 获取在蓝牙模块生效期间所有已发现的蓝牙设备
getBlue(){
var that = this
wx.getBluetoothDevices({
success: function(res) {
console.log(res)
wx.hideLoading();
for (var i = 0; i < res.devices.length; i++){
//that.data.inputValue：表示的是需要连接的蓝牙设备ID，简单点来说就是我想要连接这个蓝牙设备，所以我去遍历我搜索到的蓝牙设备中是否有这个ID
if (res.devices[i].name == that.data.inputValue || res.devices[i].localName == that.data.inputValue){
that.setData({
deviceId: res.devices[i].deviceId,
})
that.data.deviceId=res.devices[i].deviceId;
console.log(that.data.deviceId);
that.connetBlue(res.devices[i].deviceId);//4.0
return;
}
}
},
fail: function(){
console.log("搜索蓝牙设备失败")
}
})
},
4.0 wx.createBLEConnection 通过3.0步骤找到这个蓝牙之后，通过蓝牙设备的id进行蓝牙连接
connetBlue(deviceId){
var that = this;
wx.createBLEConnection({
// 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接
deviceId: deviceId,//设备id
success: function (res) {
wx.showToast({
title: '连接成功',
icon: 'fails',
duration: 800
})
console.log("连接蓝牙成功!")
wx.stopBluetoothDevicesDiscovery({
success: function (res) {
console.log('连接蓝牙成功之后关闭蓝牙搜索');
}
})
that.getServiceId()//5.0
}
})
},
5.0 wx.getBLEDeviceServices 获取蓝牙设备所有服务
// 连接上需要的蓝牙设备之后，获取这个蓝牙设备的服务uuid
getServiceId(){
var that = this
wx.getBLEDeviceServices({
// 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接
deviceId: that.data.deviceId,
success: function (res) {
var item = res.services[2];
console.log("123456",item.uuid);
that.setData({
services: item.uuid
})
console.log(that.data.deviceId,that.data.services)
that.getCharacteId(that.data.deviceId,that.data.services)//6.0
},
fail(err){
console.log(err);
}
})
},
6.0 wx.getBLEDeviceCharacteristics 获取蓝牙设备某个服务中所有特征值
indicate和notify两者一个为true即可用
getCharacteId(){
var that = this
wx.getBLEDeviceCharacteristics({
// 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接
deviceId:that.data.deviceId,
// 这里的 serviceId 需要在上面的 getBLEDeviceServices 接口中获取
serviceId:that.data.services,
success: function (res) {
console.log("我是serviceId",res.characteristics)
for (var i = 0; i < res.characteristics.length; i++) {//2个值
var item = res.characteristics[i];
if(item.properties.indicate||item.properties.notify){
console.log("我是两个符合之后的结果",item.uuid)
that.setData({
propertiesuuId: item.uuid,
})
that.startNotice(that.data.propertiesuuId)//7.0
}
if (item.properties.write == true){
that.setData({
writeId: item.uuid//用来写入的值
})
}
}
},
fail(err){
console.log("getBLEDeviceCharacteristics",err);
}
})
},
7.0 wx.notifyBLECharacteristicValueChange 启用低功耗蓝牙设备特征值变化时的 notify 功能，订阅特征值。
注意：必须设备的特征值支持 notify 或者 indicate 才可以成功调用
startNotice(uuid){
console.log("我是uuid",uuid)
var that = this;
wx.notifyBLECharacteristicValueChange({
state: true, // 启用 notify 功能
// 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接
deviceId: that.data.deviceId,
// 这里的 serviceId 需要在上面的 getBLEDeviceServices 接口中获取
serviceId: that.data.services,
// 这里的 characteristicId 需要在上面的 getBLEDeviceCharacteristics 接口中获取
characteristicId: that.data.propertiesuuId, //第一步 开启监听 notityid 第二步发送指令 write
success (res){
console.log(res,'启用低功能蓝牙监听成功');
// 监听获取数据
// ArrayBuffer转16进制字符串示例
function ab2hex(buffer) {
// console.log(Array)
let hexArr = Array.prototype.map.call(
new Uint8Array(buffer),
function(bit) {
return ('00' + bit.toString(16)).slice(-2)
}
)
return hexArr.join('');
}
// 16进制转中文字符串
function hexCharCodeToStr(hexCharCodeStr) {
var trimedStr = hexCharCodeStr.trim();
var rawStr =
trimedStr.substr(0,2).toLowerCase() === "0x"
?
trimedStr.substr(2)
:
trimedStr;
var len = rawStr.length;
if(len % 2 !== 0) {
alert("Illegal Format ASCII Code!");
return "";
}
var curCharCode;
var resultStr = [];
for(var i = 0; i < len;i = i + 2) {
curCharCode = parseInt(rawStr.substr(i, 2), 16); // ASCII Code Value
resultStr.push(String.fromCharCode(curCharCode));
}
return resultStr.join("");
}
wx.onBLECharacteristicValueChange((res)=>{
console.log(res);
console.log("@@@@@@@@@@@",res.value);
console.log(`characteristic ${res.characteristicId} has changed, now is ${res.value}`);
console.log("是我是我",res.value);
// console.log("123456789456789");
console.log("16进制转成中文字符串哦",(ab2hex(res.value)));
var newvalue=ab2hex(res.value);
console.log("aaaaaaa",newvalue);//38
var bb=newvalue.slice(0,2);//le
console.log(bb,"要我转成2进制呦",parseInt('bb',16).toString(2))
var heightya= parseInt(newvalue.slice(2,6),16);//转成10进制
var highpressure=parseInt(heightya/256);//除以256获取高压
console.log("高压",heightya,newvalue.slice(2,6));
console.log("高压最终值",highpressure);
that.setData({
highpressure:highpressure,
})
that.data.highpressure=highpressure;
var lowya=parseInt(newvalue.slice(6,10),16);//转成10进制
var lowpressure=parseInt(lowya/256);//除以256获取低压
console.log("低压",lowya,newvalue.slice(6,10));
console.log("低压最终值",lowpressure);
that.setData({
lowpressure:lowpressure,
})
that.data.lowpressure=lowpressure;
var mb=newvalue.slice(28,32);//截取脉搏
console.log("脉搏",mb);
var num1=mb.slice(0,2);//截取脉搏前两位
var num2=mb.slice(2,4);//截取脉搏后两位
console.log(num1);
console.log(num2);
var allnum="";
if(num1>num2){ //判断前两位与后两位，低位在前
allnum=parseInt((num2+num1),16);//拼接好的脉搏转成10进制
console.log(allnum);
that.setData({
pulse:allnum,
})
that.data.pulse=allnum;
}else if(num1<num2){
allnum=parseInt((num1+num2),16);
console.log(allnum);
that.setData({
pulse:allnum,
})
that.data.pulse=allnum;
}
})
},
fail(err){
console.log(err)
}
})
},
此篇仅供参考哦，如有问题尽管提。
标签：console,log,微信,蓝牙,deviceId,res,var,连接 来源： https://blog.csdn.net/weixin_46031235/article/details/113845288