Design of piece counter based on 51 single chip microcomputer

  This project is based on 51 Piece counter of single chip microcomputer , The content of the project is ： Realize the function of piece counter , This has practical significance for counting goods in the factory ; The detection distance is automatically set after the system is powered on 20cm, Objects less than this distance will cause the count to change and the buzzer to sound , Each object can only be triggered once ; Two nixie tubes are used to display the detection distance and the number of articles ; Use two keys to adjust the detection distance .

  The project uses 51 Four interrupt sources of single chip microcomputer , Respectively ： External interrupt 0, Timer interrupt 0, External interrupt 1, Timer interrupt 1. Basically, the foundation has been used up 51 All interrupt sources of the kernel , There is interrupt nesting between two timer interrupts , Is a good example of learning MCU interrupt ！！
  Project adoption Proteus Do simulation experiments , The following figure is the schematic diagram of the project , The ultrasonic sensor adopts HC-SR04（SRF04）.

  use ad The schematic diagram is drawn PCB, Layout size 8*9cm, Larger space , Easy to weld .


  Part of the code is as follows , The main content of the project is ： Nested use of interrupts 、 Sensor driver code 、 Nixie tube display code .

void start()// Ranging initialization 
{
    

	TR=1;
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_();
	_nop_(); 
	_nop_(); 
	_nop_(); 
	_nop_();
	TR=0;
}

int getdistance(void)
{
    
	start();
	while(!ECHO);
	TR1=1;
	while(ECHO);
	TR1=0;
	
	time=TH1*256+TL1;
	TH1=0;
	TL1=0;
	
	s=(time*1.7)/100;         // Measured cm
	if(flag==1||(s>700))
	{
    
		flag=0;
		s=0;
		return s;
	}
	return s;
}

The complete project includes ：keilC The language code +Proteus Simulation schematic +ad Schematic diagram PCB+ Product specification