【求助】电子秤的称值不稳定，该怎么修改程序好？-HARRY007的回答

【求助】电子秤的称值不稳定，该怎么修改程序好？

2019-07-15 12:22发布

我用的芯片是STC89C52RC,A/D转换用的HX711，显示用的是12864，传感器用的是10KG的，问题：把100G砝码放在传感器上，数值一直跳，范围在98-104之间跳动，没有稳定下来，该怎么解决？
主程序如下
#include "main.h"
#include "LCD12864.h"
#include "HX711.h"
#include "keyboard.h"

unsigned long HX711_Buffer = 0;
unsigned int Weight_Maopi = 0,Weight_Shiwu = 0;
char Price_Count = 0;
uchar KEY_NUM = 0;
unsigned char Price_Buffer[6] = {0x00,0x00,0x00,0x00,0x00,0x00};
unsigned long Money = 0;
bit Flag_OK = 0;
volatile bit FlagTest = 0; //定时测试标志，每0.5秒置位，测完清0

//定时器0初始化
void Timer0_Init()
{ EA=1;
ET0 = 1;       //允许定时器0中断
TMOD = 1;    //定时器工作方式选择
TL0 = 0xb0;
TH0 = 0x3c;    //定时器赋予初值
TR0 = 1;       //启动定时器
}

//定时器0中断
void Timer0_ISR (void) interrupt 1 using 0
{
uchar Counter;
TL0 = 0xb0;
TH0 = 0x3c;    //定时器赋予初值

//每0.5秒钟刷新重量
Counter ++;
if (Counter >= 10)
{
   FlagTest = 1;
   Counter = 0;
}
}
void main()
{
Timer0_Init();
//初中始化完成，开断
LCD12864_Reset(); //初始化液晶
LCD12864_HAIZI_SET(); //设置为普通模式

LCD12864_NoWaitIdle_COM_Write(0x80); //指针设置
LCD12864_write_word("※※※※※※※※");
LCD12864_NoWaitIdle_COM_Write(0x90); //指针设置
LCD12864_write_word("※※欢迎使用※※");
LCD12864_NoWaitIdle_COM_Write(0x88); //指针设置
LCD12864_write_word("※10公斤电子秤※");
LCD12864_NoWaitIdle_COM_Write(0x98); //指针设置
LCD12864_write_word("※※※※※※※※");

Get_Maopi(); //称毛皮重量

Delay_ms(2000);    //延时2s,等待传感器稳定
loop:
Price_Count = 0;
KEY_NUM = 0;
Price_Buffer[0] = 0;
Price_Buffer[1] = 0;
Price_Buffer[2] = 0;
Price_Buffer[3] = 0;
Price_Buffer[4] = 0;
Price_Buffer[5] = 0;
Price_Buffer[6] = 0;
Money = 0;
Flag_OK = 0;

Get_Maopi(); //称毛皮重量
LCD12864_NoWaitIdle_COM_Write(0x01); //清空

while(1)
{
LCD12864_NoWaitIdle_COM_Write(0x80); //指针设置
LCD12864_write_word("★10公斤电子秤★");

if( Flag_OK == 0)
{
if (FlagTest==1)
{
Get_Weight();
FlagTest = 0;
}
// Get_Weight(); //称重

//显示当前重量
LCD12864_NoWaitIdle_COM_Write(0x90);
LCD12864_write_word("重量：");
LCD12864_Data_Write(' ');
LCD12864_Data_Write(' ');
if( Weight_Shiwu/10000 != 0)
{
LCD12864_Data_Write(Weight_Shiwu/10000 + 0x30);
}
else
{
LCD12864_Data_Write(' ');
}
LCD12864_Data_Write(Weight_Shiwu%10000/1000 + 0x30);
LCD12864_Data_Write('.');
LCD12864_Data_Write(Weight_Shiwu%1000/100 + 0x30);
LCD12864_Data_Write(Weight_Shiwu%100/10 + 0x30);
LCD12864_Data_Write(Weight_Shiwu%10 + 0x30);

LCD12864_write_word("Kg");

}

LCD12864_NoWaitIdle_COM_Write(0x88);
LCD12864_write_word("单价：");

LCD12864_Data_Write(' ');

if( Price_Count == 0 )
{
LCD12864_Data_Write('_');
}
else
{
LCD12864_Data_Write( Price_Buffer[0] + 0x30);
}

if( Price_Count == 1 )
{
LCD12864_Data_Write('_');
}
else
{
LCD12864_Data_Write( Price_Buffer[1] + 0x30);
}

if( Price_Count == 2 )
{
LCD12864_Data_Write('_');
}
else
{
LCD12864_Data_Write( Price_Buffer[2] + 0x30);
}


if( Price_Count == 3 )
{
LCD12864_Data_Write('_');
}
else
{
LCD12864_Data_Write( Price_Buffer[3] + 0x30);
}

LCD12864_Data_Write( '.' );

if( Price_Count == 4 )
{
LCD12864_Data_Write('_');
}
else
{
LCD12864_Data_Write( Price_Buffer[4] + 0x30);
}

if( Price_Count == 5 )
{
LCD12864_Data_Write('_');
}
else
{
LCD12864_Data_Write( Price_Buffer[5] + 0x30);
}

LCD12864_write_word("元");

LCD12864_NoWaitIdle_COM_Write(0x98);
LCD12864_write_word("金额：");

LCD12864_NoWaitIdle_COM_Write(0x9f);
LCD12864_write_word("元");

KEY_NUM = KEY_Scan();

if( KEY_NUM != 0x55) //当返回的不是初值时候，确认按键按下。
{
if(KEY_NUM == 10) //数字A键，去皮功能
{
Get_Maopi(); //去皮
}

if(KEY_NUM == 15) //数字B键清除键，二次测量
{
goto loop;
}

if(KEY_NUM == 12) //数字C输入单价错误时返回上一步
{
Price_Count--;
if( Price_Count < 0)
{
Price_Count = 0;
}
}

if(KEY_NUM == 13) //数字D键，计算总价
{
Money = Price_Buffer[0] * 100000 + Price_Buffer[1] * 10000 + Price_Buffer[2]*1000 + Price_Buffer[3]*100+Price_Buffer[4]*10+Price_Buffer[5];
Money = Money * Weight_Shiwu / 1000;

LCD12864_NoWaitIdle_COM_Write(0x9b);

if( Money/1000000 > 0 )
{
LCD12864_Data_Write(Money/1000000 + 0x30);
LCD12864_Data_Write(Money%1000000/100000 + 0x30);
LCD12864_Data_Write(Money%100000/10000 + 0x30);
LCD12864_Data_Write(Money%10000/1000 + 0x30);
LCD12864_Data_Write(Money%1000/100 + 0x30);
LCD12864_Data_Write('.');
LCD12864_Data_Write(Money%100/10 + 0x30);
LCD12864_Data_Write(Money%10 + 0x30);
}
else
{
if( Money/100000 > 0 )
{
LCD12864_Data_Write(' ');
LCD12864_Data_Write(Money%1000000/100000 + 0x30);
LCD12864_Data_Write(Money%100000/10000 + 0x30);
LCD12864_Data_Write(Money%10000/1000 + 0x30);
LCD12864_Data_Write(Money%1000/100 + 0x30);
LCD12864_Data_Write('.');
LCD12864_Data_Write(Money%100/10 + 0x30);
LCD12864_Data_Write(Money%10 + 0x30);
}
else
{
if( Money/10000 > 0 )
{
LCD12864_Data_Write(' ');
LCD12864_Data_Write(' ');
LCD12864_Data_Write(Money%100000/10000 + 0x30);
LCD12864_Data_Write(Money%10000/1000 + 0x30);
LCD12864_Data_Write(Money%1000/100 + 0x30);
LCD12864_Data_Write('.');
LCD12864_Data_Write(Money%100/10 + 0x30);
LCD12864_Data_Write(Money%10 + 0x30);
}
else
{
if( Money/1000 > 0 )
{
LCD12864_Data_Write(' ');
LCD12864_Data_Write(' ');
LCD12864_Data_Write(' ');
LCD12864_Data_Write(Money%10000/1000 + 0x30);
LCD12864_Data_Write(Money%1000/100 + 0x30);
LCD12864_Data_Write('.');
LCD12864_Data_Write(Money%100/10 + 0x30);
LCD12864_Data_Write(Money%10 + 0x30);
}
else
{
LCD12864_Data_Write(' ');
LCD12864_Data_Write(' ');
LCD12864_Data_Write(' ');
LCD12864_Data_Write(' ');
LCD12864_Data_Write(Money%1000/100 + 0x30);
LCD12864_Data_Write('.');
LCD12864_Data_Write(Money%100/10 + 0x30);
LCD12864_Data_Write(Money%10 + 0x30);
}
}
}
}

Flag_OK = 1;
}

if(KEY_NUM >= 0 && KEY_NUM <= 9)    //显示输入的价格值
{
if( Price_Count < 6 )
{
Price_Buffer[Price_Count] = KEY_NUM;

Price_Count++;
}
}

}

}
}

void Get_Weight()
{
HX711_Buffer = HX711_Read();
HX711_Buffer = HX711_Buffer/100;
if(HX711_Buffer > Weight_Maopi)
{
      Weight_Shiwu = HX711_Buffer;
      Weight_Shiwu = Weight_Shiwu - Weight_Maopi;             //获取实物的AD采样数值。

      Weight_Shiwu = (unsigned int)((float)Weight_Shiwu/4.109+0.05);    //计算实物的实际重量
                                                                     //因为不同的传感器特性曲线不一样，因此，每一个传感器需要矫正这里的2.15这个除数。
                                                                     //当发现测试出来的重量偏大时，增加该数值。
                                                                     //如果测试出来的重量偏小时，减小改数值。
                                                                     //该数值一般在4.30附近调整之间。因传感器不同而定。
                                                                     //+0.05是为了四舍五入百分位
if(  Weight_Shiwu > 10000 )
{
Buzzer = 0; //打开警报
LED=!LED;
LCD12864_COM_Write(0x90);
LCD12864_write_word("※※※超重※※※");
}
else
{
if(Weight_Shiwu==0)
LED=1;
else if(Weight_Shiwu>0)
LED=0;
Buzzer = 1; //关闭警报

}
}
else if(HX711_Buffer < Weight_Maopi - 30)
{
Buzzer = 0; //负重量报警
}
// Weight_Shiwu=Weight_Shiwu/2;

}

//****************************************************
//获取毛皮重量
//****************************************************
void Get_Maopi()
{
uchar i = 0;
uint Temp_Weight = 0;

Weight_Maopi = 0;

for( i = 0 ; i < 10 ; i++)
{
      HX711_Buffer = HX711_Read();
      Temp_Weight = HX711_Buffer/100;

      if( Temp_Weight > Weight_Maopi)
      {
         Weight_Maopi = Temp_Weight;
      }
}
}

//****************************************************
//MS延时函数(12M晶振下测试)
//****************************************************
void Delay_ms(uint n)
{
unsigned int  i,j;
for(i=0;i<n;i++)
      for(j=0;j<123;j++);
}

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6条回答

HARRY007

2019-07-15 22:19

软件滤波，推荐参考一本书《匠人手记》里面有详细写各种滤波算法的实现，楼主如果有兴趣可以去买一本或者找个PDF看看。

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