土壤湿度传感器的原理及驱动

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一、介绍

1.表面采用镀镍处理,有加宽的感应面积,可以提高导电性能,防止接触土壤容易生锈的问题,延长使用寿命;
2.可以宽范围控制土壤的湿度,通过电位器调节控制相应阀值,湿度低于设定值时,DO输出高电平,高于设定值时,DO输出低电平;3.比较器采用LM393芯片,工作稳定
4.工作电压3.3V-5V

 

土壤湿度传感器原理,嵌入式硬件,单片机,嵌入式硬件

二、用途

通过电位器调节土壤湿度控制阀值,可以自动对莱园,花园自动浇水,家庭花盆土壤湿度的控制,各种电子比赛,电子积木,arduino设计等。

三、模块使用说明:
1.传感器适用于土壤的湿度检测;
⒉模块中蓝色的电位器是用于土壤湿度的阀值调节,顺时针调节,控制的湿度会越大,逆时针越小;
3.数字量输出DO可以与单片机直接相连,通过单片机来检测高低电平,由此来检测土壤湿度;
4小板模拟量输出AO可以和AD模块相连,通过AD转换,可以获得土壤湿度更精确的数值;

四、接线说明(4线制):

1 VCC外接3.3V-5V
2 GND外接GND
3 DO小板数字量输出接口(0和1)4AO小板电压模拟量输出

五、驱动程序

1、51单片机测试程序

/******************************************
传感器触发测试
单片机:STC89C52
波特率:9600
*****************************************/
#include <reg52.h>
unsigned char date;
#define uchar unsigned char
#define uint unsigned int
sbit key1=P0^1;


/* 函数申明 -----------------------------------------------*/
void delay(uint z);
void Initial_com(void);

//***********************************************************

/*
********************************************************************************
** 函数名称 : delay(uint z)
** 函数功能 : 延时函数
********************************************************************************
*/
void delay(uint z)
{																							   
    uint i,j;
    for(i=z;i>0;i--)
        for(j=110;j>0;j--);
} 


//******************************

//*****串口初始化函数***********

//******************************
void Initial_com(void)
{
 EA=1;        //开总中断
 ES=1;        //允许串口中断
 ET1=1;        //允许定时器T1的中断
 TMOD=0x20;   //定时器T1,在方式2中断产生波特率
 PCON=0x00;   //SMOD=0
 SCON=0x50;   // 方式1 由定时器控制
 TH1=0xfd;    //波特率设置为9600
 TL1=0xfd;
 TR1=1;       //开定时器T1运行控制位

}




//*************************
//**********主函数*********
//*************************
main()
{
	 Initial_com();
	 while(1)
	 {
	
	 	 if(key1==0)
		{
			delay();	  //消抖动
			if(key1==0)	  //确认触发
			{
				 SBUF=0X01;
				 delay(200);
				
			
			}
	   
		}
		 
		  if(RI)
		  {
			date=SBUF;    //单片机接受
			SBUF=date;    //单片机发送
			RI=0;
		  }
		
		
	  }
}

2、32单片机测试程序(ADC采集)

AD.c

#include "stm32f10x.h"                  // Device header

void AD_Init(void)
{
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	
	RCC_ADCCLKConfig(RCC_PCLK2_Div6);
	
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);
	
	ADC_InitTypeDef ADC_InitStructure;
	ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
	ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
	ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
	ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
	ADC_InitStructure.ADC_ScanConvMode = DISABLE;
	ADC_InitStructure.ADC_NbrOfChannel = 1;
	ADC_Init(ADC1, &ADC_InitStructure);
	
	ADC_Cmd(ADC1, ENABLE);
	
	ADC_ResetCalibration(ADC1);
	while (ADC_GetResetCalibrationStatus(ADC1) == SET);
	ADC_StartCalibration(ADC1);
	while (ADC_GetCalibrationStatus(ADC1) == SET);
}

uint16_t AD_GetValue(void)
{
	ADC_SoftwareStartConvCmd(ADC1, ENABLE);
	while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
	return ADC_GetConversionValue(ADC1);
}

AD.h

#ifndef __AD_H
#define __AD_H

void AD_Init(void);
uint16_t AD_GetValue(void);

#endif

OLED.C

#include "stm32f10x.h"
#include "OLED_Font.h"

/*引脚配置*/
#define OLED_W_SCL(x)		GPIO_WriteBit(GPIOB, GPIO_Pin_8, (BitAction)(x))
#define OLED_W_SDA(x)		GPIO_WriteBit(GPIOB, GPIO_Pin_9, (BitAction)(x))

/*引脚初始化*/
void OLED_I2C_Init(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
	
	GPIO_InitTypeDef GPIO_InitStructure;
 	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
 	GPIO_Init(GPIOB, &GPIO_InitStructure);
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
 	GPIO_Init(GPIOB, &GPIO_InitStructure);
	
	OLED_W_SCL(1);
	OLED_W_SDA(1);
}

/**
  * @brief  I2C开始
  * @param  无
  * @retval 无
  */
void OLED_I2C_Start(void)
{
	OLED_W_SDA(1);
	OLED_W_SCL(1);
	OLED_W_SDA(0);
	OLED_W_SCL(0);
}

/**
  * @brief  I2C停止
  * @param  无
  * @retval 无
  */
void OLED_I2C_Stop(void)
{
	OLED_W_SDA(0);
	OLED_W_SCL(1);
	OLED_W_SDA(1);
}

/**
  * @brief  I2C发送一个字节
  * @param  Byte 要发送的一个字节
  * @retval 无
  */
void OLED_I2C_SendByte(uint8_t Byte)
{
	uint8_t i;
	for (i = 0; i < 8; i++)
	{
		OLED_W_SDA(Byte & (0x80 >> i));
		OLED_W_SCL(1);
		OLED_W_SCL(0);
	}
	OLED_W_SCL(1);	//额外的一个时钟,不处理应答信号
	OLED_W_SCL(0);
}

/**
  * @brief  OLED写命令
  * @param  Command 要写入的命令
  * @retval 无
  */
void OLED_WriteCommand(uint8_t Command)
{
	OLED_I2C_Start();
	OLED_I2C_SendByte(0x78);		//从机地址
	OLED_I2C_SendByte(0x00);		//写命令
	OLED_I2C_SendByte(Command); 
	OLED_I2C_Stop();
}

/**
  * @brief  OLED写数据
  * @param  Data 要写入的数据
  * @retval 无
  */
void OLED_WriteData(uint8_t Data)
{
	OLED_I2C_Start();
	OLED_I2C_SendByte(0x78);		//从机地址
	OLED_I2C_SendByte(0x40);		//写数据
	OLED_I2C_SendByte(Data);
	OLED_I2C_Stop();
}

/**
  * @brief  OLED设置光标位置
  * @param  Y 以左上角为原点,向下方向的坐标,范围:0~7
  * @param  X 以左上角为原点,向右方向的坐标,范围:0~127
  * @retval 无
  */
void OLED_SetCursor(uint8_t Y, uint8_t X)
{
	OLED_WriteCommand(0xB0 | Y);					//设置Y位置
	OLED_WriteCommand(0x10 | ((X & 0xF0) >> 4));	//设置X位置高4位
	OLED_WriteCommand(0x00 | (X & 0x0F));			//设置X位置低4位
}

/**
  * @brief  OLED清屏
  * @param  无
  * @retval 无
  */
void OLED_Clear(void)
{  
	uint8_t i, j;
	for (j = 0; j < 8; j++)
	{
		OLED_SetCursor(j, 0);
		for(i = 0; i < 128; i++)
		{
			OLED_WriteData(0x00);
		}
	}
}

/**
  * @brief  OLED显示一个字符
  * @param  Line 行位置,范围:1~4
  * @param  Column 列位置,范围:1~16
  * @param  Char 要显示的一个字符,范围:ASCII可见字符
  * @retval 无
  */
void OLED_ShowChar(uint8_t Line, uint8_t Column, char Char)
{      	
	uint8_t i;
	OLED_SetCursor((Line - 1) * 2, (Column - 1) * 8);		//设置光标位置在上半部分
	for (i = 0; i < 8; i++)
	{
		OLED_WriteData(OLED_F8x16[Char - ' '][i]);			//显示上半部分内容
	}
	OLED_SetCursor((Line - 1) * 2 + 1, (Column - 1) * 8);	//设置光标位置在下半部分
	for (i = 0; i < 8; i++)
	{
		OLED_WriteData(OLED_F8x16[Char - ' '][i + 8]);		//显示下半部分内容
	}
}

/**
  * @brief  OLED显示字符串
  * @param  Line 起始行位置,范围:1~4
  * @param  Column 起始列位置,范围:1~16
  * @param  String 要显示的字符串,范围:ASCII可见字符
  * @retval 无
  */
void OLED_ShowString(uint8_t Line, uint8_t Column, char *String)
{
	uint8_t i;
	for (i = 0; String[i] != '\0'; i++)
	{
		OLED_ShowChar(Line, Column + i, String[i]);
	}
}

/**
  * @brief  OLED次方函数
  * @retval 返回值等于X的Y次方
  */
uint32_t OLED_Pow(uint32_t X, uint32_t Y)
{
	uint32_t Result = 1;
	while (Y--)
	{
		Result *= X;
	}
	return Result;
}

/**
  * @brief  OLED显示数字(十进制,正数)
  * @param  Line 起始行位置,范围:1~4
  * @param  Column 起始列位置,范围:1~16
  * @param  Number 要显示的数字,范围:0~4294967295
  * @param  Length 要显示数字的长度,范围:1~10
  * @retval 无
  */
void OLED_ShowNum(uint8_t Line, uint8_t Column, uint32_t Number, uint8_t Length)
{
	uint8_t i;
	for (i = 0; i < Length; i++)							
	{
		OLED_ShowChar(Line, Column + i, Number / OLED_Pow(10, Length - i - 1) % 10 + '0');
	}
}

/**
  * @brief  OLED显示数字(十进制,带符号数)
  * @param  Line 起始行位置,范围:1~4
  * @param  Column 起始列位置,范围:1~16
  * @param  Number 要显示的数字,范围:-2147483648~2147483647
  * @param  Length 要显示数字的长度,范围:1~10
  * @retval 无
  */
void OLED_ShowSignedNum(uint8_t Line, uint8_t Column, int32_t Number, uint8_t Length)
{
	uint8_t i;
	uint32_t Number1;
	if (Number >= 0)
	{
		OLED_ShowChar(Line, Column, '+');
		Number1 = Number;
	}
	else
	{
		OLED_ShowChar(Line, Column, '-');
		Number1 = -Number;
	}
	for (i = 0; i < Length; i++)							
	{
		OLED_ShowChar(Line, Column + i + 1, Number1 / OLED_Pow(10, Length - i - 1) % 10 + '0');
	}
}

/**
  * @brief  OLED显示数字(十六进制,正数)
  * @param  Line 起始行位置,范围:1~4
  * @param  Column 起始列位置,范围:1~16
  * @param  Number 要显示的数字,范围:0~0xFFFFFFFF
  * @param  Length 要显示数字的长度,范围:1~8
  * @retval 无
  */
void OLED_ShowHexNum(uint8_t Line, uint8_t Column, uint32_t Number, uint8_t Length)
{
	uint8_t i, SingleNumber;
	for (i = 0; i < Length; i++)							
	{
		SingleNumber = Number / OLED_Pow(16, Length - i - 1) % 16;
		if (SingleNumber < 10)
		{
			OLED_ShowChar(Line, Column + i, SingleNumber + '0');
		}
		else
		{
			OLED_ShowChar(Line, Column + i, SingleNumber - 10 + 'A');
		}
	}
}

/**
  * @brief  OLED显示数字(二进制,正数)
  * @param  Line 起始行位置,范围:1~4
  * @param  Column 起始列位置,范围:1~16
  * @param  Number 要显示的数字,范围:0~1111 1111 1111 1111
  * @param  Length 要显示数字的长度,范围:1~16
  * @retval 无
  */
void OLED_ShowBinNum(uint8_t Line, uint8_t Column, uint32_t Number, uint8_t Length)
{
	uint8_t i;
	for (i = 0; i < Length; i++)							
	{
		OLED_ShowChar(Line, Column + i, Number / OLED_Pow(2, Length - i - 1) % 2 + '0');
	}
}

/**
  * @brief  OLED初始化
  * @param  无
  * @retval 无
  */
void OLED_Init(void)
{
	uint32_t i, j;
	
	for (i = 0; i < 1000; i++)			//上电延时
	{
		for (j = 0; j < 1000; j++);
	}
	
	OLED_I2C_Init();			//端口初始化
	
	OLED_WriteCommand(0xAE);	//关闭显示
	
	OLED_WriteCommand(0xD5);	//设置显示时钟分频比/振荡器频率
	OLED_WriteCommand(0x80);
	
	OLED_WriteCommand(0xA8);	//设置多路复用率
	OLED_WriteCommand(0x3F);
	
	OLED_WriteCommand(0xD3);	//设置显示偏移
	OLED_WriteCommand(0x00);
	
	OLED_WriteCommand(0x40);	//设置显示开始行
	
	OLED_WriteCommand(0xA1);	//设置左右方向,0xA1正常 0xA0左右反置
	
	OLED_WriteCommand(0xC8);	//设置上下方向,0xC8正常 0xC0上下反置

	OLED_WriteCommand(0xDA);	//设置COM引脚硬件配置
	OLED_WriteCommand(0x12);
	
	OLED_WriteCommand(0x81);	//设置对比度控制
	OLED_WriteCommand(0xCF);

	OLED_WriteCommand(0xD9);	//设置预充电周期
	OLED_WriteCommand(0xF1);

	OLED_WriteCommand(0xDB);	//设置VCOMH取消选择级别
	OLED_WriteCommand(0x30);

	OLED_WriteCommand(0xA4);	//设置整个显示打开/关闭

	OLED_WriteCommand(0xA6);	//设置正常/倒转显示

	OLED_WriteCommand(0x8D);	//设置充电泵
	OLED_WriteCommand(0x14);

	OLED_WriteCommand(0xAF);	//开启显示
		
	OLED_Clear();				//OLED清屏
}

 OLED.H

#ifndef __OLED_H
#define __OLED_H

void OLED_Init(void);
void OLED_Clear(void);
void OLED_ShowChar(uint8_t Line, uint8_t Column, char Char);
void OLED_ShowString(uint8_t Line, uint8_t Column, char *String);
void OLED_ShowNum(uint8_t Line, uint8_t Column, uint32_t Number, uint8_t Length);
void OLED_ShowSignedNum(uint8_t Line, uint8_t Column, int32_t Number, uint8_t Length);
void OLED_ShowHexNum(uint8_t Line, uint8_t Column, uint32_t Number, uint8_t Length);
void OLED_ShowBinNum(uint8_t Line, uint8_t Column, uint32_t Number, uint8_t Length);

#endif

 OLED_Font.h

#ifndef __OLED_FONT_H
#define __OLED_FONT_H

/*OLED字模库,宽8像素,高16像素*/
const uint8_t OLED_F8x16[][16]=
{
	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//  0
	
	0x00,0x00,0x00,0xF8,0x00,0x00,0x00,0x00,
	0x00,0x00,0x00,0x33,0x30,0x00,0x00,0x00,//! 1
	
	0x00,0x10,0x0C,0x06,0x10,0x0C,0x06,0x00,
	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//" 2
	
	0x40,0xC0,0x78,0x40,0xC0,0x78,0x40,0x00,
	0x04,0x3F,0x04,0x04,0x3F,0x04,0x04,0x00,//# 3
	
	0x00,0x70,0x88,0xFC,0x08,0x30,0x00,0x00,
	0x00,0x18,0x20,0xFF,0x21,0x1E,0x00,0x00,//$ 4
	
	0xF0,0x08,0xF0,0x00,0xE0,0x18,0x00,0x00,
	0x00,0x21,0x1C,0x03,0x1E,0x21,0x1E,0x00,//% 5
	
	0x00,0xF0,0x08,0x88,0x70,0x00,0x00,0x00,
	0x1E,0x21,0x23,0x24,0x19,0x27,0x21,0x10,//& 6
	
	0x10,0x16,0x0E,0x00,0x00,0x00,0x00,0x00,
	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//' 7
	
	0x00,0x00,0x00,0xE0,0x18,0x04,0x02,0x00,
	0x00,0x00,0x00,0x07,0x18,0x20,0x40,0x00,//( 8
	
	0x00,0x02,0x04,0x18,0xE0,0x00,0x00,0x00,
	0x00,0x40,0x20,0x18,0x07,0x00,0x00,0x00,//) 9
	
	0x40,0x40,0x80,0xF0,0x80,0x40,0x40,0x00,
	0x02,0x02,0x01,0x0F,0x01,0x02,0x02,0x00,//* 10
	
	0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,
	0x01,0x01,0x01,0x1F,0x01,0x01,0x01,0x00,//+ 11
	
	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
	0x80,0xB0,0x70,0x00,0x00,0x00,0x00,0x00,//, 12
	
	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
	0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01,//- 13
	
	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
	0x00,0x30,0x30,0x00,0x00,0x00,0x00,0x00,//. 14
	
	0x00,0x00,0x00,0x00,0x80,0x60,0x18,0x04,
	0x00,0x60,0x18,0x06,0x01,0x00,0x00,0x00,/// 15
	
	0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,
	0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00,//0 16
	
	0x00,0x10,0x10,0xF8,0x00,0x00,0x00,0x00,
	0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//1 17
	
	0x00,0x70,0x08,0x08,0x08,0x88,0x70,0x00,
	0x00,0x30,0x28,0x24,0x22,0x21,0x30,0x00,//2 18
	
	0x00,0x30,0x08,0x88,0x88,0x48,0x30,0x00,
	0x00,0x18,0x20,0x20,0x20,0x11,0x0E,0x00,//3 19
	
	0x00,0x00,0xC0,0x20,0x10,0xF8,0x00,0x00,
	0x00,0x07,0x04,0x24,0x24,0x3F,0x24,0x00,//4 20
	
	0x00,0xF8,0x08,0x88,0x88,0x08,0x08,0x00,
	0x00,0x19,0x21,0x20,0x20,0x11,0x0E,0x00,//5 21
	
	0x00,0xE0,0x10,0x88,0x88,0x18,0x00,0x00,
	0x00,0x0F,0x11,0x20,0x20,0x11,0x0E,0x00,//6 22
	
	0x00,0x38,0x08,0x08,0xC8,0x38,0x08,0x00,
	0x00,0x00,0x00,0x3F,0x00,0x00,0x00,0x00,//7 23
	
	0x00,0x70,0x88,0x08,0x08,0x88,0x70,0x00,
	0x00,0x1C,0x22,0x21,0x21,0x22,0x1C,0x00,//8 24
	
	0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,
	0x00,0x00,0x31,0x22,0x22,0x11,0x0F,0x00,//9 25
	
	0x00,0x00,0x00,0xC0,0xC0,0x00,0x00,0x00,
	0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,//: 26
	
	0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,
	0x00,0x00,0x80,0x60,0x00,0x00,0x00,0x00,//; 27
	
	0x00,0x00,0x80,0x40,0x20,0x10,0x08,0x00,
	0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x00,//< 28
	
	0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x00,
	0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x00,//= 29
	
	0x00,0x08,0x10,0x20,0x40,0x80,0x00,0x00,
	0x00,0x20,0x10,0x08,0x04,0x02,0x01,0x00,//> 30
	
	0x00,0x70,0x48,0x08,0x08,0x08,0xF0,0x00,
	0x00,0x00,0x00,0x30,0x36,0x01,0x00,0x00,//? 31
	
	0xC0,0x30,0xC8,0x28,0xE8,0x10,0xE0,0x00,
	0x07,0x18,0x27,0x24,0x23,0x14,0x0B,0x00,//@ 32
	
	0x00,0x00,0xC0,0x38,0xE0,0x00,0x00,0x00,
	0x20,0x3C,0x23,0x02,0x02,0x27,0x38,0x20,//A 33
	
	0x08,0xF8,0x88,0x88,0x88,0x70,0x00,0x00,
	0x20,0x3F,0x20,0x20,0x20,0x11,0x0E,0x00,//B 34
	
	0xC0,0x30,0x08,0x08,0x08,0x08,0x38,0x00,
	0x07,0x18,0x20,0x20,0x20,0x10,0x08,0x00,//C 35
	
	0x08,0xF8,0x08,0x08,0x08,0x10,0xE0,0x00,
	0x20,0x3F,0x20,0x20,0x20,0x10,0x0F,0x00,//D 36
	
	0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,
	0x20,0x3F,0x20,0x20,0x23,0x20,0x18,0x00,//E 37
	
	0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,
	0x20,0x3F,0x20,0x00,0x03,0x00,0x00,0x00,//F 38
	
	0xC0,0x30,0x08,0x08,0x08,0x38,0x00,0x00,
	0x07,0x18,0x20,0x20,0x22,0x1E,0x02,0x00,//G 39
	
	0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,
	0x20,0x3F,0x21,0x01,0x01,0x21,0x3F,0x20,//H 40
	
	0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0x00,
	0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//I 41
	
	0x00,0x00,0x08,0x08,0xF8,0x08,0x08,0x00,
	0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,0x00,//J 42
	
	0x08,0xF8,0x88,0xC0,0x28,0x18,0x08,0x00,
	0x20,0x3F,0x20,0x01,0x26,0x38,0x20,0x00,//K 43
	
	0x08,0xF8,0x08,0x00,0x00,0x00,0x00,0x00,
	0x20,0x3F,0x20,0x20,0x20,0x20,0x30,0x00,//L 44
	
	0x08,0xF8,0xF8,0x00,0xF8,0xF8,0x08,0x00,
	0x20,0x3F,0x00,0x3F,0x00,0x3F,0x20,0x00,//M 45
	
	0x08,0xF8,0x30,0xC0,0x00,0x08,0xF8,0x08,
	0x20,0x3F,0x20,0x00,0x07,0x18,0x3F,0x00,//N 46
	
	0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,
	0x0F,0x10,0x20,0x20,0x20,0x10,0x0F,0x00,//O 47
	
	0x08,0xF8,0x08,0x08,0x08,0x08,0xF0,0x00,
	0x20,0x3F,0x21,0x01,0x01,0x01,0x00,0x00,//P 48
	
	0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,
	0x0F,0x18,0x24,0x24,0x38,0x50,0x4F,0x00,//Q 49
	
	0x08,0xF8,0x88,0x88,0x88,0x88,0x70,0x00,
	0x20,0x3F,0x20,0x00,0x03,0x0C,0x30,0x20,//R 50
	
	0x00,0x70,0x88,0x08,0x08,0x08,0x38,0x00,
	0x00,0x38,0x20,0x21,0x21,0x22,0x1C,0x00,//S 51
	
	0x18,0x08,0x08,0xF8,0x08,0x08,0x18,0x00,
	0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,//T 52
	
	0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,
	0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,//U 53
	
	0x08,0x78,0x88,0x00,0x00,0xC8,0x38,0x08,
	0x00,0x00,0x07,0x38,0x0E,0x01,0x00,0x00,//V 54
	
	0xF8,0x08,0x00,0xF8,0x00,0x08,0xF8,0x00,
	0x03,0x3C,0x07,0x00,0x07,0x3C,0x03,0x00,//W 55
	
	0x08,0x18,0x68,0x80,0x80,0x68,0x18,0x08,
	0x20,0x30,0x2C,0x03,0x03,0x2C,0x30,0x20,//X 56
	
	0x08,0x38,0xC8,0x00,0xC8,0x38,0x08,0x00,
	0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,//Y 57
	
	0x10,0x08,0x08,0x08,0xC8,0x38,0x08,0x00,
	0x20,0x38,0x26,0x21,0x20,0x20,0x18,0x00,//Z 58
	
	0x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x00,
	0x00,0x00,0x00,0x7F,0x40,0x40,0x40,0x00,//[ 59
	
	0x00,0x0C,0x30,0xC0,0x00,0x00,0x00,0x00,
	0x00,0x00,0x00,0x01,0x06,0x38,0xC0,0x00,//\ 60
	
	0x00,0x02,0x02,0x02,0xFE,0x00,0x00,0x00,
	0x00,0x40,0x40,0x40,0x7F,0x00,0x00,0x00,//] 61
	
	0x00,0x00,0x04,0x02,0x02,0x02,0x04,0x00,
	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//^ 62
	
	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
	0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,//_ 63
	
	0x00,0x02,0x02,0x04,0x00,0x00,0x00,0x00,
	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//` 64
	
	0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,
	0x00,0x19,0x24,0x22,0x22,0x22,0x3F,0x20,//a 65
	
	0x08,0xF8,0x00,0x80,0x80,0x00,0x00,0x00,
	0x00,0x3F,0x11,0x20,0x20,0x11,0x0E,0x00,//b 66
	
	0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00,
	0x00,0x0E,0x11,0x20,0x20,0x20,0x11,0x00,//c 67
	
	0x00,0x00,0x00,0x80,0x80,0x88,0xF8,0x00,
	0x00,0x0E,0x11,0x20,0x20,0x10,0x3F,0x20,//d 68
	
	0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,
	0x00,0x1F,0x22,0x22,0x22,0x22,0x13,0x00,//e 69
	
	0x00,0x80,0x80,0xF0,0x88,0x88,0x88,0x18,
	0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//f 70
	
	0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,
	0x00,0x6B,0x94,0x94,0x94,0x93,0x60,0x00,//g 71
	
	0x08,0xF8,0x00,0x80,0x80,0x80,0x00,0x00,
	0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,//h 72
	
	0x00,0x80,0x98,0x98,0x00,0x00,0x00,0x00,
	0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//i 73
	
	0x00,0x00,0x00,0x80,0x98,0x98,0x00,0x00,
	0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,//j 74
	
	0x08,0xF8,0x00,0x00,0x80,0x80,0x80,0x00,
	0x20,0x3F,0x24,0x02,0x2D,0x30,0x20,0x00,//k 75
	
	0x00,0x08,0x08,0xF8,0x00,0x00,0x00,0x00,
	0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//l 76
	
	0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x00,
	0x20,0x3F,0x20,0x00,0x3F,0x20,0x00,0x3F,//m 77
	
	0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,
	0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,//n 78
	
	0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,
	0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,//o 79
	
	0x80,0x80,0x00,0x80,0x80,0x00,0x00,0x00,
	0x80,0xFF,0xA1,0x20,0x20,0x11,0x0E,0x00,//p 80
	
	0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x00,
	0x00,0x0E,0x11,0x20,0x20,0xA0,0xFF,0x80,//q 81
	
	0x80,0x80,0x80,0x00,0x80,0x80,0x80,0x00,
	0x20,0x20,0x3F,0x21,0x20,0x00,0x01,0x00,//r 82
	
	0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,
	0x00,0x33,0x24,0x24,0x24,0x24,0x19,0x00,//s 83
	
	0x00,0x80,0x80,0xE0,0x80,0x80,0x00,0x00,
	0x00,0x00,0x00,0x1F,0x20,0x20,0x00,0x00,//t 84
	
	0x80,0x80,0x00,0x00,0x00,0x80,0x80,0x00,
	0x00,0x1F,0x20,0x20,0x20,0x10,0x3F,0x20,//u 85
	
	0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,
	0x00,0x01,0x0E,0x30,0x08,0x06,0x01,0x00,//v 86
	
	0x80,0x80,0x00,0x80,0x00,0x80,0x80,0x80,
	0x0F,0x30,0x0C,0x03,0x0C,0x30,0x0F,0x00,//w 87
	
	0x00,0x80,0x80,0x00,0x80,0x80,0x80,0x00,
	0x00,0x20,0x31,0x2E,0x0E,0x31,0x20,0x00,//x 88
	
	0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,
	0x80,0x81,0x8E,0x70,0x18,0x06,0x01,0x00,//y 89
	
	0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x00,
	0x00,0x21,0x30,0x2C,0x22,0x21,0x30,0x00,//z 90
	
	0x00,0x00,0x00,0x00,0x80,0x7C,0x02,0x02,
	0x00,0x00,0x00,0x00,0x00,0x3F,0x40,0x40,//{ 91
	
	0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,
	0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,//| 92
	
	0x00,0x02,0x02,0x7C,0x80,0x00,0x00,0x00,
	0x00,0x40,0x40,0x3F,0x00,0x00,0x00,0x00,//} 93
	
	0x00,0x06,0x01,0x01,0x02,0x02,0x04,0x04,
	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//~ 94
};

#endif

Delay.c

#include "stm32f10x.h"

/**
  * @brief  微秒级延时
  * @param  xus 延时时长,范围:0~233015
  * @retval 无
  */
void Delay_us(uint32_t xus)
{
	SysTick->LOAD = 72 * xus;				//设置定时器重装值
	SysTick->VAL = 0x00;					//清空当前计数值
	SysTick->CTRL = 0x00000005;				//设置时钟源为HCLK,启动定时器
	while(!(SysTick->CTRL & 0x00010000));	//等待计数到0
	SysTick->CTRL = 0x00000004;				//关闭定时器
}

/**
  * @brief  毫秒级延时
  * @param  xms 延时时长,范围:0~4294967295
  * @retval 无
  */
void Delay_ms(uint32_t xms)
{
	while(xms--)
	{
		Delay_us(1000);
	}
}
 
/**
  * @brief  秒级延时
  * @param  xs 延时时长,范围:0~4294967295
  * @retval 无
  */
void Delay_s(uint32_t xs)
{
	while(xs--)
	{
		Delay_ms(1000);
	}
} 

Delay.h 

#ifndef __DELAY_H
#define __DELAY_H

void Delay_us(uint32_t us);
void Delay_ms(uint32_t ms);
void Delay_s(uint32_t s);

#endif

 main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "AD.h"

uint16_t ADValue;
float Voltage;

int main(void)
{
	OLED_Init();
	AD_Init();
	
	OLED_ShowString(1, 1, "ADValue:");
	OLED_ShowString(2, 1, "Volatge:0.00V");
	
	while (1)
	{
		ADValue = AD_GetValue();
		Voltage = (float)ADValue / 4095 * 3.3;
		
		OLED_ShowNum(1, 9, ADValue, 4);
		OLED_ShowNum(2, 9, Voltage, 1);
		OLED_ShowNum(2, 11, (uint16_t)(Voltage * 100) % 100, 2);
		
		Delay_ms(100);
	}
}

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土壤湿度传感器原理,嵌入式硬件,单片机,嵌入式硬件

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