# 51单片机温湿度计
## 说明
这个分支采用低功耗蓝牙(BLE)接收数据。
## 先决条件
#### 硬件准备
硬件都是我自己掏钱买的,有很多替代品,你也可以选择自己喜欢的硬件进行开发&复刻。
注意,烧录时硬件选项需要选中 使能6T(双倍速)模式、降低振荡器的放大增益。
| 名称 | 本例使用的型号 | 购买连接 |
| -------------- | -------------- | ------------------------------------------------------------ |
| 51单片机开发板 | STC89C52 | (晶振频率:11.0952MHz) |
| 低功耗蓝牙模块 | DX-BT24 BLE5.1 | [BT24低功耗蓝牙模块无线串口通信透传BLE5.1/5.0兼容HC08替CC2541-淘宝网](https://item.taobao.com/item.htm?spm=a1z09.2.0.0.21742e8deXzB3k&id=621716432187&_u=d3enn5lf3177) |
| 温度传感器 | SHT30 | [SHT20 SHT30/31/35温湿度传感器模块I2C通讯数字型 宽电压 传感器-天猫](https://detail.tmall.com/item.htm?id=595422048645&spm=a1z09.2.0.0.21742e8deXzB3k&_u=d3enn5lf97cc) |
#### 蓝牙调试助手
这里使用 [深圳大夏龙雀科技有限公司](http://www.szdx-smart.com) 提供的微信小程序 ```大夏龙雀-串口助手``` 进行调试。
#### 硬件连接
硬件连接框图:
<img src="README.assets/%E8%BF%9E%E6%8E%A5%E7%A4%BA%E6%84%8F%E5%9B%BE.svg" alt="连接示意图" style="zoom:125%;" />
##### 低功耗蓝牙模块(DX-BT24 BLE5.1)与51单片机引脚连接
| DX-BT24 BLE5.1 | STC89C52 | 说明 |
| -------------- | --------- | ------------------------------------ |
| STATE | P3.2 | 用于指示蓝牙连接状态,高电平为已连接 |
| RXD | TXD(P3.1) | |
| TXD | RXD(P3.0) | |
| GND | \ | |
| VCC | \ | |
| EN | \ | 悬空 |
##### 温湿度传感器(SHT30)与51单片机引脚连接
| SHT30 | STC89C52 |
| ----- | -------- |
| SCL | P2.0 |
| SDA | P2.1 |
| GND | \ |
| VCC | \ |
## 快速开始
### 1、编译并且烧录程序
使用 ```keil``` 打开 ```C52\mainProj.uvproj``` ,编译并且将其生成的可执行文件 ```*.hex``` 烧录到51单片机中。
### 2、使用 ```大夏龙雀-串口助手``` 连接低功耗蓝牙设备
通过微信搜素 ```大夏龙雀-串口助手``` 小程序,并且连接到您的蓝牙模块之后,即可看到当前传感器获得的温湿度信息。
<img src="README.assets/F366685D61EB428FBE5E16E12D26FAEB.jpg" alt="img" style="zoom: 33%;" />
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