基于RT-Thread系统的迷你时钟

项目目标

通过OLED显示屏显示时间与温湿度的基本功能。

准备工作

软件

RT-Thread Studio v2.1.0
I2C设备驱动（用于读取温湿度传感器）
sht3X软件包（使用sht30进行温湿度测量）
at_device软件包（使用esp8266wifi模块进行网络连接）
netutils软件包（用于获取NTP时间）
u8g2软件包（驱动OLED显示）
cpp组件（支持u8g2软件包）

硬件

小熊派开发板
ESP8266
sht30温湿度传感器
OLED

项目开发

IIC设置

打开IIC设置

设置为与sht31传感器相连的引脚

温湿度测量

sht30使用方法：首先进行init初始化，调用sht3x_read_singleshot函数读取传感器的采集信息，其返回6字节数组
1[温度高八位]

2[温度第八位]

3[温度crc校验]

4[湿度高八位]

5[湿度第八位]

6[湿度crc校验]

以下为读取数据的函数

rt_err_t sht3x_read_singleshot(sht3x_device_t dev)
{rt_uint8_t temp[6] ;rt_err_t result;RT_ASSERT(dev);result = rt_mutex_take(dev->lock, RT_WAITING_FOREVER);if (result == RT_EOK){if( write_cmd(dev, dev->cmd_readout) == RT_EOK){// wait about 5 msrt_thread_mdelay(5);if(read_bytes(dev, temp, 6) == RT_EOK){if(crc8(temp, 2) == temp[2]){dev->temperature = -45.0 + (temp[1] | temp[0] << 8) * 175.0 / (0xFFFF - 1) ; //sensor temperature convert to realityresult = RT_EOK ;}else{result = -RT_ERROR ;}if(crc8(temp + 3, 2) == temp[5]){dev->humidity = (temp[4] | temp[3] << 8) * 0.0015259022 ; //sensor humidity convert to reality}else{result = -RT_ERROR ;}}else{result = -RT_ERROR ;}}else{result = -RT_ERROR ;}rt_mutex_release(dev->lock);}else{LOG_E("Taking mutex of SHT3x failed.");result = -RT_ERROR;}return result;
}

在终端输入以下指令即可通过串口显示温湿度值

sht3x probe i2c2 pd   //根据实际连接的引脚选择正确的iic总线
sht3x read

获取时间

打开at_device详细配置，配置如下
SSID 和密码即为所连接wifi名称与密码

我们需要手动开启lpusart1串口，在boar.h文件中添加如下定义

编译下载即可在控制台访问网络

打开软件模拟RTP和at_device详细配置，使能NTP

控制台发送指令即可获取当前时间

ntp_sync

OLED显示时间与温湿度

打开ugg2软件包详细配置，使能IIC OLED,如下图

打开ssd1306_12864_sw_i2c_example.cpp文件，修改相应的引脚

编译下载，在控制台输入ssd1306_12864_sw_i2c_example进行测试
正常显示后即可关闭该实例文件。

然后编写函数将得到的时间与温湿度数据通过OLED显示出来
application分组下创建一个用户文件oled_display.cpp文件，存放本项目中的OLED显示代码

#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include <U8g2lib.h>
#include <stdio.h>#include <drv_soft_i2c.h>extern "C"
{
#include <sht3x.h>
}
extern "C"
{
sht3x_device_t sht3x_init(const char *i2c_bus_name, rt_uint8_t sht3x_addr);
rt_err_t sht3x_read_singleshot(sht3x_device_t dev);
}#define OLED_I2C_PIN_SCL                    7// PA7
#define OLED_I2C_PIN_SDA                    20// PB4static U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0,\/* clock=*/ OLED_I2C_PIN_SCL,\/* data=*/ OLED_I2C_PIN_SDA,\/* reset=*/ U8X8_PIN_NONE);#define SUN 0
#define SUN_CLOUD  1
#define CLOUD 2
#define RAIN 3
#define THUNDER 4static void drawWeatherSymbol(u8g2_uint_t x, u8g2_uint_t y, uint8_t symbol)
{// fonts used:// u8g2_font_open_iconic_embedded_6x_t// u8g2_font_open_iconic_weather_6x_t// encoding values, see: https://github.com/olikraus/u8g2/wiki/fntgrpiconicswitch(symbol){case SUN:u8g2.setFont(u8g2_font_open_iconic_weather_6x_t);u8g2.drawGlyph(x, y, 69);break;case SUN_CLOUD:u8g2.setFont(u8g2_font_open_iconic_weather_6x_t);u8g2.drawGlyph(x, y, 65);break;case CLOUD:u8g2.setFont(u8g2_font_open_iconic_weather_6x_t);u8g2.drawGlyph(x, y, 64);break;case RAIN:u8g2.setFont(u8g2_font_open_iconic_weather_6x_t);u8g2.drawGlyph(x, y, 67);break;case THUNDER:u8g2.setFont(u8g2_font_open_iconic_embedded_6x_t);u8g2.drawGlyph(x, y, 67);break;}
}static void drawWeather(uint8_t symbol, int degree)
{drawWeatherSymbol(0, 63, symbol);u8g2.setFont(u8g2_font_logisoso32_tf);u8g2.setCursor(55, 63);u8g2.print(degree);u8g2.print("C");
}
static void drawHumidity(uint8_t symbol, int humidity)
{drawWeatherSymbol(0, 63, symbol);u8g2.setFont(u8g2_font_logisoso32_tf);u8g2.setCursor(55, 63);u8g2.print(humidity);u8g2.print("%");
}void oled_display()
{u8g2.begin();u8g2.clearBuffer();u8g2.setFont(u8g2_font_logisoso32_tf);u8g2.setCursor(48+3, 42);u8g2.print("Hi~");     // requires enableUTF8Print()u8g2.setFont(u8g2_font_6x13_tr);            // choose a suitable fontu8g2.drawStr(30, 60, "By Mculover666");   // write something to the internal memoryu8g2.sendBuffer();sht3x_device_t  sht3x_device;sht3x_device = sht3x_init("i2c1", 0x44);rt_thread_mdelay(2000);int status = 0;char mstr[3];char hstr[3];time_t now;struct tm *p;int min = 0, hour = 0;int temperature = 0,humidity = 0;while(1){switch(status){case 0:now = time(RT_NULL);p=gmtime((const time_t*) &now);hour = p->tm_hour;min = p->tm_min;sprintf(mstr, "%02d", min);sprintf(hstr, "%02d", hour);u8g2.firstPage();do {u8g2.setFont(u8g2_font_logisoso42_tn);u8g2.drawStr(0,63,hstr);u8g2.drawStr(50,63,":");u8g2.drawStr(67,63,mstr);} while ( u8g2.nextPage() );rt_thread_mdelay(5000);status = 1;break;case 1:if(RT_EOK == sht3x_read_singleshot(sht3x_device)){temperature = (int)sht3x_device->temperature;}else{temperature = 0;}u8g2.clearBuffer();drawWeather(SUN, temperature);u8g2.sendBuffer();rt_thread_mdelay(5000);status = 2;break;case 2:if(RT_EOK == sht3x_read_singleshot(sht3x_device)){humidity = (int)sht3x_device->humidity;}else{humidity = 0;}u8g2.clearBuffer();drawHumidity(RAIN, humidity);u8g2.sendBuffer();rt_thread_mdelay(5000);status = 0;break;}}
}
MSH_CMD_EXPORT(oled_display, oled start);

最后在main.c文件中调用 oled_display()函数
代码如下


int main(void)
{//获取网卡对象struct netdev* net = netdev_get_by_name("esp0");//阻塞判断当前网络是否正常连接while(netdev_is_internet_up(net) != 1){rt_thread_mdelay(200);}//NTP自动对时time_t cur_time;cur_time = ntp_sync_to_rtc(NULL);oled_display();}

结果展示

https://blog.csdn.net/Mculover666/article/details/104428132

参考文献

https://www.rt-thread.org/document/site/#/development-tools/rtthread-studio/applications/project-collection/project-collection