【Follow me第二季第2期】SHT40温湿度模块获取环境数据

lijinlei

【Follow me第二季第2期】SHT40温湿度模块获取环境数据 [复制链接]

<i class="pstatus"> 本帖最后由 lijinlei 于 2024-9-13 03:29 编辑 </i>

# 【Follow me第二季第2期】SHT40温湿度模块获取环境数据
## SHT40 传感器模块

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<p><strong>SHT40 module.jpg</strong> <em class="xg1">(143.75 KB, 下载次数: 0)</em></p>
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<a href="javascript:;" class="loginf" >下载附件</a>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_843106" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=843106&handlekey=savephoto_843106">保存到相册</a>

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官网详见 [Adafruit Sensirion SHT40](https://learn.adafruit.com/adafruit-sht40-temperature-humidity-sensor/arduino) 和 [GitHub - adafruit/Adafruit-SHT40-PCB](https://github.com/adafruit/Adafruit-SHT40-PCB/)

### 原理图

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## SHT40 传感器

### 参数

SHT40传感器相关参数如下

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<div class="tip tip_4 aimg_tip" id="aimg_843107_menu" style="position: absolute; display: none" disautofocus="true">
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<p><strong>SHT40 sensor.png</strong> <em class="xg1">(23.72 KB, 下载次数: 0)</em></p>
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<a href="javascript:;" class="loginf" >下载附件</a>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_843107" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=843107&handlekey=savephoto_843107">保存到相册</a>

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### IIC 地址

0x44 是 IIC 地址。

### 数据传输协议

当地址最低位是0，表示读数据，最低位是1，表示写数据；

当发送 0xFD 指令时，代表高精度测量温湿度；

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<div class="tip tip_4 aimg_tip" id="aimg_843105_menu" style="position: absolute; display: none" disautofocus="true">
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<p><strong>sht40 IIC address.png</strong> <em class="xg1">(15.94 KB, 下载次数: 0)</em></p>
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<a href="javascript:;" class="loginf" >下载附件</a>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_843105" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=843105&handlekey=savephoto_843105">保存到相册</a>

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对数据进行公式计算

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<div class="tip tip_4 aimg_tip" id="aimg_843104_menu" style="position: absolute; display: none" disautofocus="true">
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<p><strong>formula.png</strong> <em class="xg1">(8.06 KB, 下载次数: 0)</em></p>
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<a href="javascript:;" class="loginf" >下载附件</a>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_843104" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=843104&handlekey=savephoto_843104">保存到相册</a>

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便可得到温湿度数据。

参考：[SHT40数字温湿度传感器 (sensirion.com)](https://sensirion.com/cn/products/product-catalog/SHT40) .

## 实物连线图

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<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_843097" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=843097&handlekey=savephoto_843097">保存到相册</a>

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## 程序下载

打开并下载例程至开发板即可在串口打印输出当前环境的温湿度信息。

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<div class="tip tip_4 aimg_tip" id="aimg_843102_menu" style="position: absolute; display: none" disautofocus="true">
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<p><strong>example_sht40.png</strong> <em class="xg1">(23.03 KB, 下载次数: 0)</em></p>
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<a href="javascript:;" class="loginf" >下载附件</a>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_843102" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=843102&handlekey=savephoto_843102">保存到相册</a>

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## Qwiic 连线

若使用 Qwiic 线（SH1.0mm 端子线双头反向）连接，

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则根据开发板 [Qwiic 接口](https://docs.arduino.cc/tutorials/uno-r4-wifi/qwiic/) 通信协议，

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<div class="tip tip_4 aimg_tip" id="aimg_843101_menu" style="position: absolute; display: none" disautofocus="true">
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<p><strong>arduino qwiic.png</strong> <em class="xg1">(40.76 KB, 下载次数: 0)</em></p>
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<a href="javascript:;" class="loginf" >下载附件</a>

<a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_843101" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=843101&handlekey=savephoto_843101">保存到相册</a>

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需要对例程代码稍作修改，即将 `sht4.begin()` 改为 `sht4.begin(&Wire1)` ，串口输出结果如下图所示

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### 代码

完整代码如下

```c++
#include "Adafruit_SHT4x.h"

Adafruit_SHT4x sht4 = Adafruit_SHT4x();

void setup() {
Serial.begin(115200);

while (!Serial)
  delay(10); // will pause Zero, Leonardo, etc until serial console opens

Serial.println("Adafruit SHT4x test");
if (! sht4.begin(&Wire1)) {
  Serial.println("Couldn't find SHT4x");
  while (1) delay(1);
}
Serial.println("Found SHT4x sensor");
Serial.print("Serial number 0x");
Serial.println(sht4.readSerial(), HEX);

// You can have 3 different precisions, higher precision takes longer
sht4.setPrecision(SHT4X_HIGH_PRECISION);
switch (sht4.getPrecision()) {
 case SHT4X_HIGH_PRECISION: 
   Serial.println("High precision");
   break;
 case SHT4X_MED_PRECISION: 
   Serial.println("Med precision");
   break;
 case SHT4X_LOW_PRECISION: 
   Serial.println("Low precision");
   break;
}

// You can have 6 different heater settings
// higher heat and longer times uses more power
// and reads will take longer too!
sht4.setHeater(SHT4X_NO_HEATER);
switch (sht4.getHeater()) {
 case SHT4X_NO_HEATER: 
   Serial.println("No heater");
   break;
 case SHT4X_HIGH_HEATER_1S: 
   Serial.println("High heat for 1 second");
   break;
 case SHT4X_HIGH_HEATER_100MS: 
   Serial.println("High heat for 0.1 second");
   break;
 case SHT4X_MED_HEATER_1S: 
   Serial.println("Medium heat for 1 second");
   break;
 case SHT4X_MED_HEATER_100MS: 
   Serial.println("Medium heat for 0.1 second");
   break;
 case SHT4X_LOW_HEATER_1S: 
   Serial.println("Low heat for 1 second");
   break;
 case SHT4X_LOW_HEATER_100MS: 
   Serial.println("Low heat for 0.1 second");
   break;
}

}

void loop() {
sensors_event_t humidity, temp;

uint32_t timestamp = millis();
sht4.getEvent(&humidity, &temp);// populate temp and humidity objects with fresh data
timestamp = millis() - timestamp;

Serial.print("Temperature: "); Serial.print(temp.temperature); Serial.println(" degrees C");
Serial.print("Humidity: "); Serial.print(humidity.relative_humidity); Serial.println("% rH");

Serial.print("Read duration (ms): ");
Serial.println(timestamp);

delay(1000);
}
```

【Follow me第二季第2期】SHT40温湿度模块获取环境数据 [复制链接]

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