Microcontroller learning record - digital tube

Static digital tube

Hardware Hookup 

The figure shows a common anode digital tube. The 8 segments of the digital tube are 8 LEDs. The anodes of the LEDs are connected together and connected to a high level. When the cathode of a segment is connected to a low level, the segment will light up.

software design 

Put the segment codes from 0 to F into the array and display 0 to F in sequence.

unsigned char DIG_CODE[16]={0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07,0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71};

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

* Function name: static_dig

* Function: Static digital tube displays in sequence

* Input: None

* Output: None

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

void static_dig(void)

{

    unsigned char i = 0;

    for (i=0; i<16; i++)

    {

        DIG = ~DIG_CODE[i];

        delay1s();

    }

}

Dynamic digital tube

Hardware Hookup 

The bit selection segment of the digital tube is connected to the output of the 38 decoder. The segment selection terminal is connected to the output of the 74573 follower. 

At a certain moment, only one digital tube can be lit. The intervals between the lighting of each digital tube can be shortened to take advantage of the afterglow effect of the human eye. It looks like all digital tubes are lit at the same time, showing different code values.

software design

unsigned char DIG_CODE[16]={0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07,0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71};

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

* Function name: dongtai_all

* Function: Each digital tube displays different contents in turn

* Input: None

* Output: None

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

void dongtai_all(void)

{

    unsigned char i = 0;

    for (i=0; i<8; i++)

    {

        WEI = i; //Bit selection, decide which digital tube is lit

        DUAN = DIG_CODE[i+1]; //Segment selection, determines which segment of the digital tube lights up (which number lights up)

        delay1s();

    }

}