写一个树莓派qt5的Qwidget类显示dht11温湿度程序
时间: 2023-08-15 16:07:13 浏览: 134
好的,我可以帮您编写一个树莓派Qt5的QWidget类显示DHT11温湿度的程序,具体实现如下:
1. 首先,您需要在树莓派上安装Qt5开发环境,可以通过以下命令进行安装:
```
sudo apt-get install qt5-default
```
2. 在Qt Creator中创建一个新的QWidget类,并添加一个QLabel和一个QPushButton控件,用于显示温湿度和更新数据按钮。
3. 在QWidget类的头文件中,添加以下代码:
```c++
#ifndef DHT11WIDGET_H
#define DHT11WIDGET_H
#include <QWidget>
#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
class Dht11Widget : public QWidget
{
Q_OBJECT
public:
Dht11Widget(QWidget *parent = nullptr);
private slots:
void updateData();
private:
QLabel *m_tempLabel;
QLabel *m_humidityLabel;
QPushButton *m_updateButton;
void readDht11Data(float *temp, float *humidity);
};
#endif // DHT11WIDGET_H
```
4. 在QWidget类的实现文件中,添加以下代码:
```c++
#include "dht11widget.h"
#define MAX_TIMINGS 85
#define DHT_PIN 7
Dht11Widget::Dht11Widget(QWidget *parent)
: QWidget(parent)
{
m_tempLabel = new QLabel("Temperature: N/A", this);
m_tempLabel->setGeometry(10, 10, 200, 20);
m_humidityLabel = new QLabel("Humidity: N/A", this);
m_humidityLabel->setGeometry(10, 40, 200, 20);
m_updateButton = new QPushButton("Update", this);
m_updateButton->setGeometry(10, 70, 80, 30);
connect(m_updateButton, SIGNAL(clicked()), this, SLOT(updateData()));
}
void Dht11Widget::updateData()
{
float temp, humidity;
readDht11Data(&temp, &humidity);
char tempStr[20], humidityStr[20];
sprintf(tempStr, "Temperature: %.1f C", temp);
m_tempLabel->setText(tempStr);
sprintf(humidityStr, "Humidity: %.1f %%", humidity);
m_humidityLabel->setText(humidityStr);
}
void Dht11Widget::readDht11Data(float *temp, float *humidity)
{
int dht11_dat[5] = { 0, 0, 0, 0, 0 };
uint8_t laststate = HIGH;
uint8_t counter = 0;
uint8_t j = 0, i;
pinMode(DHT_PIN, OUTPUT);
digitalWrite(DHT_PIN, LOW);
delay(18);
digitalWrite(DHT_PIN, HIGH);
delayMicroseconds(40);
pinMode(DHT_PIN, INPUT);
for (i = 0; i < MAX_TIMINGS; i++) {
counter = 0;
while (digitalRead(DHT_PIN) == laststate) {
counter++;
delayMicroseconds(1);
if (counter == 255) {
break;
}
}
laststate = digitalRead(DHT_PIN);
if (counter == 255) {
break;
}
if ((i >= 4) && (i % 2 == 0)) {
dht11_dat[j / 8] <<= 1;
if (counter > 16) {
dht11_dat[j / 8] |= 1;
}
j++;
}
}
if ((j >= 40) &&
(dht11_dat[4] == ((dht11_dat[0] + dht11_dat[1] + dht11_dat[2] + dht11_dat[3]) & 0xff))) {
*humidity = (float)dht11_dat[0];
*temp = (float)dht11_dat[2];
}
else {
*humidity = 0;
*temp = 0;
}
}
```
5. 编译并运行程序,即可通过点击“Update”按钮来更新温湿度数据。
希望这个程序能够帮助到您!
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