Electronic Scale Design Simulation Using Proteus

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This design is from ErZhe Technology’s Proteus series for electronic scales, mainly used in vegetable markets. It can set prices and calculate amounts based on price and weight. This design uses the Proteus simulation software, with AT89C51 as the main controller, ADC0832 chip for ADC conversion, and LCD1602 display. A matrix keyboard is designed for price input. The design difficulty is rated at 3 stars (out of 5). First, design the circuit diagram; since there are not many modules, the interfaces can be assigned freely. The circuit simulation diagram is shown in Figure 1.

Electronic Scale Design Simulation Using Proteus

Figure 1. The design needs to be carried out step by step. Generally, prioritize the human-computer interaction module at the beginning. Here, we prioritize the design of the LCD1602. The driver program is as follows:

void wrc(uint8 c){     delay(1);     rs=0;     rw=0;     e=0;     P0=c;     e=1;     delay(1);     e=0;}void wrd(uint8 dat){     delay(1);     rs=1;     rw=0;     e=0;     P0=dat;     e=1;     delay(1);     e=0;     rs=0;}void init(){            delay(1);     wrc(0x38);     wrc(0x38);     wrc(0x38);     wrc(0x06);     wrc(0x0c);     wrc(0x01);}

With the screen display ready, we can design the other modules. The priority for the buttons and ADC is about the same, so we can choose freely. Here, we prioritize the design of the ADC0832 module, with the following code:

unsigned char A_D(unsigned char CH)    //AD function{   unsigned char i,adval,test; //define local variables and initialize   adval=0x00;   test=0x00;   DI=1;                       //DI initial high level before the first clock pulse's falling edge, indicating the start signal   _nop_();                                 CS=0;                       //chip select   _nop_();   Clk=1;                      //clk rising edge, start bit written in   _nop_();   if(CH==0x00)                //select channel 0   {       Clk=0;                  //clk low level       DI=1;                                    _nop_();       Clk=1;                  //clk rising edge, first bit of channel 0 written in       _nop_();       Clk=0;       DI=1;       _nop_();       Clk=1;                   //clk rising edge, second bit of channel 0 written in       _nop_();   }   else   {       Clk=0;       DI=1;       _nop_();       Clk=1;                    //clk rising edge, first bit of channel 1 written in       _nop_();       Clk=0;       DI=1;       _nop_();                   //clk rising edge, second bit of channel 1 written in       Clk=1;       _nop_();   }   Clk=0;   DI=1;   for(i=0;i<8;i++)               //read eight AD values from high to low   {       _nop_();       adval<<=1;       Clk=1;       _nop_();       Clk=0;       if(DO)           adval|=0x01;       else           adval|=0x00;   }   for(i=0;i<8;i++)   {                       test>>=1;                   //read eight AD values from low to high                       if(DO)           test|=0x80;         else                         test|=0x00;           _nop_();           Clk=1;           _nop_();           Clk=0;   }   if(adval==test)    dat=test;    //if both read values are equal, assign the read number to DAT   _nop_();   CS=1;   DO=1;   Clk=1;   return dat;    }

Finally, let’s design the matrix keyboard, which is also quite simple and generally known to those who have studied microcontrollers. The code is as follows:

uint8 keyscan()           //key scan program{    uint8 h,l,value;    P1=0x0f;    h=P1&0x0f;    if(h!=0x0f)    {         delay(1);         if(h!=0x0f)         {             h=P1&0x0f;             l=P1|0xf0;             P1=l;             l=P1&0xf0;             h=P1&0x0f;             value=h+l;                 }         return value;    }}

With all the drivers ready, the last step is to implement the logic. Since the logic code is quite lengthy, I won’t paste it here. Let’s take a look at the effect!

Author: ErZhe Technology Source: https://mbb.eet-china.com/forum/topic/90048_1_1.html

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