RT-Thread-【基于RT-Thread瑞萨RA6M4的土壤湿度采集系统】RT-Thread问答社区

【基于RT-Thread瑞萨RA6M4的土壤湿度采集系统】

发布于 2022-07-20 00:38:24 浏览：680 订阅该版

[tocm]

# 1、项目说明
基于RT-Thread+瑞萨RA6M4 采集土壤湿度信息 ，并通过iic 在OLED SSD1306屏幕上显示。
# 2、项目结构

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20220720/ed20ad7ad5ddb3df437e3ca3cdf5281c.png)
# 3、详细设计
## 3.1 读取传感器数据
### 3.1.1 传感器介绍

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20220720/e0d8f8a1ee7f023a0ad4eaf6b0ba9d31.png.webp)

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20220720/b7a2a31923e3f1105067682c06849823.png.webp)
## 3.2 读取数据
使用ADC读取模拟量
ADC配置可参考[【开发板评测】Renesas RA6M4开发板之ADC、GPIO](http://https://club.rt-thread.org/ask/article/d6a61a2d915859b0.html "【开发板评测】Renesas RA6M4开发板之ADC、GPIO")
# 3、OLED显示
添加SSD1306软件包

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20220720/e24ce14afc5958bc7fd5cdc50d46bf9f.png)
需要0.96寸I2C驱动的OLED屏幕进行动态显示，SDA—-p511(p50b);SCL—-p512(p50c)，公式首先将p去掉还有三位，以p511为例，最后转换的数字为 “(5x16x16)+(1x10)+1”算出来为 1291 转换为16进制为0x50b。注：在程序里的话需要将字符转为数字。
配置项如下
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20220720/cc0971fca153d7cfc9907bd77687d311.png)
# 4、代码实现
soil_moisture.c
```c
/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2022-07-18     gerhardt       the first version
 */

#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>
#include <string.h>
#include <stdio.h>
#include "ssd1306.h"

#define ADC_DEV_NAME        "adc0"      /* ADC 设备名称 */
#define ADC_DEV_CHANNEL     0           /* ADC 通道 */

int collection(){
        rt_adc_device_t adc_dev;
        rt_uint32_t value, vol;
        rt_err_t ret = RT_EOK;

//初始化ssd1306
        ssd1306_Init();

/* 查找设备 */
            adc_dev = (rt_adc_device_t)rt_device_find(ADC_DEV_NAME);
            if (adc_dev == RT_NULL)
            {
                rt_kprintf("adc sample run failed! can't find %s device!\n", ADC_DEV_NAME);
                return RT_ERROR;
            }

while(1){
        /* 使能设备 */
        ret = rt_adc_enable(adc_dev, ADC_DEV_CHANNEL);
        /* 读取采样值 */
        value = rt_adc_read(adc_dev, ADC_DEV_CHANNEL);
        rt_kprintf("the value is :%d \n", value);

/* 转换为对应电压值,3.3V对应12位最大值4096,数据精度乘以100保留2位小数 */
        vol = value * 330 / 4096;
        rt_kprintf("the voltage is :%d.%02d \n", vol / 100, vol % 100);
        /**
          * 湿润土壤：0-2000
         * 干燥土壤  2000-4096
         */
    if (value<2000){
        ssd1306_Fill(Black);
        ssd1306_SetCursor(18, 0);
        ssd1306_WriteString("soil moisture:", Font_7x10, White);
        ssd1306_SetCursor(40, 26);
        ssd1306_WriteString("moist", Font_11x18, White);
        ssd1306_UpdateScreen();
    } else {
        ssd1306_Fill(Black);
        ssd1306_SetCursor(18, 0);
        ssd1306_WriteString("soil moisture:", Font_7x10, White);
        ssd1306_SetCursor(45, 26);
        ssd1306_WriteString("dry", Font_11x18, White);
        ssd1306_UpdateScreen();
    }
        rt_thread_mdelay(1000);

}
            /* 关闭通道 */
                ret = rt_adc_disable(adc_dev, ADC_DEV_CHANNEL);
        return ret;
}

/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(collection, Soil moisture collection);

```
soil_moisture.h
```c
/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2022-07-19     gerhardt       the first version
 */
#ifndef SRC_SOIL_MOISTURE_H_
#define SRC_SOIL_MOISTURE_H_

int collection(void);

#endif /* SRC_SOIL_MOISTURE_H_ */

```
[Git储存仓库](https://gitee.com/gerhardt1024/ra6m4-Humidity-collection "Git储存仓库")
# 5、视频演示
<iframe src="//player.bilibili.com/player.html?aid=601026997&bvid=BV1hB4y1a7Ts&cid=778139109&page=1" scrolling="no" border="0" frameborder="no" framespacing="0" allowfullscreen="true"> </iframe>
[视频演示](https://www.bilibili.com/video/BV1hB4y1a7Ts?spm_id_from=333.999.0.0&vd_source=e3fa46c13cf837764d48c2ce1c9ba494 "视频演示")

![screenshot_b6efe68a52f2c824170b546479c40e5.jpg](https://oss-club.rt-thread.org/uploads/20220720/e8db223599d2eb2b0a8bcc6f48256d6c.jpg.webp)