MCU AD receiving UART sending module circuit diagram PCB and vb host computer source code

The AD receiving UART transmitting module circuit schematic and PCB diagram drawn by Altium Designer are as follows:

【A brief description】

1. Dimensions: 50mm long x 25mm wide x 10mm high
2. Main chip: ATMEGA8
3. Working voltage: DC 5V

II. Features:
1. Detection analog voltage range 0~5V
2. Digital tube display range 0~5000
3. Four-digit digital tube display
4. Simple input and output wiring
5. AD conversion frequency 125K, 8-bit data conversion
6. Baud rate: 9600, error rate: 0.156%

3. Function: Convert the analog voltage of 0~5V into a digital value of 0~5000, which is displayed by a digital tube and converted into a hexadecimal value of 0~255. It is sent by the microcontroller UART (i.e., TXD port) and can communicate directly with the computer after 232 level conversion.

AD receiving UART sending module AD conversion value display

The microcontroller source program is as follows:

#include

#include  

#define uchar unsigned char

#define uint  unsigned int

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

                Digital tube segment code definition 0123456789

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

uchar Table[10]={0xc0,0Xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; //Bitcode of the required segment

uchar wei[4]={0X10,0X20,0X40,0X80}; //bit control end (simulation) 

//uchar wei[4]={0Xe0,0Xd0,0Xb0,0X70}; //bit control end (board) 

uint date; //define data type 

uchar z,x,c,v; //define data type 

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

                                                                Delay function                                                                           

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

void DelayMs(uint i)  //0.25ms

{uint j;

for(;i!=0;i--)

  {for(j=8000;j!=0;j--) {;}}

}

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

                Digital tube dynamic scanning

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

void Pre_Display()

{ 

/***********************Data conversion********************************/ 

  z=date/1000; //Find the thousandth place

  x=date%1000/100; //get the hundredth place

  c=date%100/10; //Find the tenth digit

  v=date%10; //find the unit digit

      PORTD=wei[0];

          PORTB=Table[z];

          DelayMs(1);  

            PORTD=wei[1];

      PORTB=Table[x];

          DelayMs(1);  

             PORTD=wei[2];

      PORTB=Table[c];

          DelayMs(1);  

      PORTD=wei[3];

      PORTB=Table[v];

          DelayMs(1);  

  }

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

                                                                Voltage value processing function                                                                           

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

uint ADC_Convert(void)

{uint temp1,temp2;

temp1=(uint)ADCL;//先读ADCL

temp2=(uint)ADCH;//再读ADCH

temp2=(temp2<<8)+temp1;//evaluation

temp2=temp2*49/10; //Calculate the displayed voltage value (0~5.12) V

if(temp2>=5000)temp2=5000;

return(temp2);

}

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

                      Initialize I/O port

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

void Init_IO(void) //Initialize I/O port

{

DDRC=0x00; //Set port C to input without pull-up;

PORTC=0x00;

DDRB=0xff; //Set port B to push-pull 1 output;

PORTB=0xff;

DDRD=0xFF; //Set port D to push-pull 1 output;

PORTD=0xFF;

}

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

                      Serial port initialization subroutine

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

void Uart_Init(void)

{

    UCSRB  =  0x00;     //disable while setting baud rate

    UCSRA = 0x00; //Bit1 is 1, then send at double speed

    UCSRC  =  0x86;  

    UBRRL = 0x33; //Baud rate: 9600 Bps

    UBRRH = 0x00; //Error rate: 0.156%

    UCSRB  =  0x18;  

}

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

                     Serial port send byte subroutine

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

void Putchar(unsigned char c)

{

   while (!(UCSRA&(1<   UDR=c;

}

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

                                                                Main function                                                                           

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

void main(void)

{uint i;

uint B=50;

uint TXD;

Init_IO();

Uart_Init();

ADMUX=0x00; 

                   //Select the first channel;

/**********************The conversion rate should be between 50~200K****************************/

ADCSR=0xe6; //125K conversion rate, free conversion mode; start AD converter;

DelayMs(1); //Delay until the system is stable;

while(1)

{

B--;

i=ADC_Convert(); //Display voltage value (0~1024)

……………………