UniApp implements smart door locks and access control systems

UniApp is a cross-platform development framework based on Vue.js, which can develop applications for multiple platforms such as iOS, Android and H5 at the same time. It is characterized by high development efficiency, excellent performance, and good cross-platform compatibility. In this article, we will introduce how to use UniApp to implement smart door locks and access control systems, with code examples attached.

1. Development environment setup
   First, you need to install Node.js and HBuilderX, and then install the Vue plug-in and Uni plug-in in HBuilderX. Next, create a UniApp project and choose a suitable template to initialize.
2. Design interface
   Create two pages in the page folder, one is the door lock control page, and the other is the access control record page. Place two buttons on the door lock control page, one for opening the door lock and one for closing the door lock. Place a list on the access control record page to display access control records.

3. Implement the communication function
   Add the following code in the main.js file to communicate with the smart door lock:

   // 建立与设备的连接
   uni.onBLEConnectionStateChange(function(res){
     if(res.connected){
    console.log('设备已连接');
     }else{
    console.log('设备已断开');
     }
   });
   
   // 打开门锁
   function openDoor(){
     uni.writeBLECharacteristicValue({
    deviceId: '设备ID',
    serviceId: '服务ID',
    characteristicId: '特征ID',
    value: new ArrayBuffer([0x01]),
    success: function(res){
      console.log('打开门锁成功');
    },
    fail: function(res){
      console.log('打开门锁失败');
    }
     });
   }
   
   // 关闭门锁
   function closeDoor(){
     uni.writeBLECharacteristicValue({
    deviceId: '设备ID',
    serviceId: '服务ID',
    characteristicId: '特征ID',
    value: new ArrayBuffer([0x00]),
    success: function(res){
      console.log('关闭门锁成功');
    },
    fail: function(res){
      console.log('关闭门锁失败');
    }
     });
   }

   Add in the mounted function of the access control record page The following code is used to obtain access control records:

   // 获取门禁记录
   function getAccessRecords(){
     uni.request({
    url: 'http://门禁记录接口地址',
    method: 'GET',
    success: function(res){
      console.log('获取门禁记录成功');
      console.log(res.data);
    },
    fail: function(res){
      console.log('获取门禁记录失败');
    }
     });
   }

4. Page logic interaction
   Call the function that opens and closes the door lock in the button click event on the door lock control page:

   <template>
     <view>
    <button @click="openDoor">打开门锁</button>
    <button @click="closeDoor">关闭门锁</button>
     </view>
   </template>
   
   <script>
   import {openDoor, closeDoor} from 'main.js';
   
   export default {
     methods: {
    openDoor(){
      openDoor();
    },
    closeDoor(){
      closeDoor();
    }
     }
   }
   </script>

   Call the function to obtain access control records in the mounted function on the access control record page:

   <template>
     <view>
    <ul>
      <li v-for="record in records" :key="record.id">{{record.name}}</li>
    </ul>
     </view>
   </template>
   
   <script>
   import {getAccessRecords} from 'main.js';
   
   export default {
     data(){
    return {
      records: []
    };
     },
     mounted(){
    getAccessRecords();
     }
   }
   </script>

Through the above code examples, we can use UniApp to develop smart door locks and access control systems. basic skills. Developers can appropriately modify the code to meet project requirements based on actual needs. In addition, this article only provides simple code examples. In actual development, details such as the processing of device connection and disconnection, and the storage and display of access control records need to be considered.

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