Design and production of automatic control system for fish tank with automatic fish feeding

I am often away from home for several days, and have always wanted to make something that feeds fish automatically. I searched for it on the Internet for a long time, and I saw one that used a 15F104W microcontroller and only used the timer function to vibrate the fish food at a fixed time. I didn't like it very much. Today I would like to share with you a small work that I designed and made by myself, and I am quite satisfied with it.

The actual picture produced is as follows:

Pin Assignment lcd lcddata: P0

lcd_e: P2^7

lcd_rs: P2^6

lcd_rw: P2^5

    Set the button limit_choise: P //Temperature upper and lower limit selection button

            increase_temperature P //Increase temperature limit button

            reduce_temperature P //Reduce temperature limit button

    Buzzer alarm warning P   

    Temperature sensor temperature_sensor P

    Heating

    Refrigerating

    LED display normal P //Normal temperature indicator

            high_temperature P //High temperature indicator light

            low_temperature P //Low temperature indicator   

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

The C language reference source code is as follows:

#include

void DelayUs(unsigned char tu)

{

while(–tu);

}

void DelayMs(unsigned char tm)

{

while(tm–)

{

DelayUs(248);

DelayUs(248);

}

}

void dianji() //Feed the fish

{

unsigned int i;

speed=10;

i=3000;

while(i–)

{

A_ON

DelayMs(speed);

AB_ON

DelayMs(speed);

B_ON

DelayMs(speed);

BC_ON

DelayMs(speed);

C_ON

DelayMs(speed);

CD_ON

DelayMs(speed);

D_ON

DelayMs(speed);

DA_ON

DelayMs(speed);

}

ABCD_OFF

}

void dianji_shoudong() //Manually feed the fish

{

unsigned int i;

speed=10;

i=500;

while(i–)

{

A_ON

DelayMs(speed);

AB_ON

DelayMs(speed);

B_ON

DelayMs(speed);

BC_ON

DelayMs(speed);

C_ON

DelayMs(speed);

CD_ON

DelayMs(speed);

D_ON

DelayMs(speed);

DA_ON

DelayMs(speed);

}

ABCD_OFF

}

void Timer0Init()

{

TMOD|=0X01;

TH0=0xB8; //11.0592M crystal oscillator timing 20ms

TL0=0x00;

ET0=1;

EA=1;

TR0=1;

}

void main()//main function

{

init(); //initialization function

K1=1;

XIAODU=1;

YANGQI=1;

BENG=1;

Timer0Init();

while(1)

{

temp_control(); //Control button function

unnormal_proccessing(get_temp(Ds18b20ReadTemp()),up_limit_temp,down_limit_temp);//Constant temperature control function

if((h0)&(m0)&(s5))BENG=0; if((h3)&(m0)&(s0))BENG=1;

if((h4)&(m0)&(s0))BENG=0; if((h7)&(m0)&(s0))BENG=1;

if((h8)&(m0)&(s0))BENG=0; if((h11)&(m0)&(s0))BENG=1;

if(BENG1)

{

YANGQI=0;

XIAODU=1;

}

else

{

YANGQI=1;

XIAODU=0;

}

if((h6)&(m0)&(s0))

{

dianji();

}

if(K10)

{

DelayMs(20);

if(K10)

{

dianji_shoudong();

}

}

}

}

void init()//initialization function

{

uint i,j;

// Function initialization

LcdInit(); //LCD initialization function

Ds18b20Init();

//I/O port initialization

heating=1;//No heating

refrigerating=1; // No refrigeration

normal=1; //Normal temperature indicator light does not display

unnormal=1; // Abnormal temperature indicator light does not display

warning=1; //Buzzer does not alarm

//LCD initialization display

LcdWriteCom(0x80); //First line display

j=strlen(num1);

for(i=0; i{

LcdWriteData(num1[i]);

delay_ms(1);

}

LcdWriteCom(0x80+0x40); //The second line is displayed

j=strlen(num2);

for(i=0; i{

LcdWriteData(num2[i]);

delay_ms(1);

}

LcdWriteCom(0x04); //Close writing a pointer plus 1

}

uint get_temp(uint temp) //Calculate temperature function

{

float tp;

tp=temp; //Because the data processing has a decimal point, the temperature is assigned to a floating point variable

//If the temperature is positive, then the original code of the positive number is the complement code itself

temp=tp0.0625100+0.5;

//Leave two decimal points and *100, +0.5 is rounded, because the decimal point is rounded when the C language floating point number is converted to an integer

//The number behind is automatically removed, regardless of whether it is greater than 0.5, and after +0.5, the number greater than 0.5 is increased by 1, and the number less than 0.5 is increased by 1.

//Calculate and add 0.5, or after the decimal point.

return temp;

}

void display_real_tenp(uint temp) //Real-time temperature display function

{

uchar datas[] = {0, 0, 0, 0}; //define array

datas[0] = temp % 10000 / 1000;

datas[1] = temp % 1000 / 100;

datas[2] = temp % 100 / 10;

datas[3] = temp % 10;

LcdWriteCom(0x80+0x0a); //Write address 80 indicates the initial address

LcdWriteData('0'+datas[0]); //ten digits

LcdWriteCom(0x80+0x0b); //Write address 80 indicates the initial address

LcdWriteData('0'+datas[1]); //unit

LcdWriteCom(0x80+0x0d); //Write address 80 indicates the initial address

LcdWriteData('0'+datas[2]); //Display decimal point

LcdWriteCom(0x80+0x0e); //Write address 80 indicates the initial address

LcdWriteData('0'+datas[3]); //Display decimal point

}

void temp_control()//Control temperature upper and lower limit function

{

if(limit_choise0)//Select button

{

delay_ms(5);

if(limit_choise0)

{

while(!limit_choise);

limit_choise_num++;

if(limit_choise_num>=3)

{

limit_choise_num=0;

}

}

}

if(limit_choise_num==0)//normal display

{

LcdWriteCom(0x0c); //Close the cursor

display_real_tenp(get_temp(Ds18b20ReadTemp()));//display function

}

if(limit_choise_num1) //Adjust the upper limit temperature

{

LcdWriteCom(0x80+0X40+2);

LcdWriteCom(0x0f); //Open the cursor

if(increase_temperature0) //Increase temperature

{

delay_ms(5);

if(increase_temperature0)

{

while(!increase_temperature);

up_limit_temp++;

if(up_limit_temp>=100)

{

up_limit_temp=0;

}

//Write new data

LcdWriteCom(0x80+0X40+0x03);

LcdWriteData('0'+up_limit_temp/10);

LcdWriteCom(0x80+0X40+0x04);

LcdWriteData('0'+up_limit_temp%10);

LcdWriteCom(0x80+0X40+2); //Cursor write back

}

}

if(reduce_temperature0) //Reduce temperature

{

delay_ms(5);

if(reduce_temperature==0)

{

while(!reduce_temperature);

up_limit_temp–;

if(up_limit_temp<0)

{

up_limit_temp=99;

}

//Write new data

LcdWriteCom(0x80+0X40+0x03);

LcdWriteData('0'+up_limit_temp/10);

LcdWriteCom(0x80+0X40+0x04);

LcdWriteData('0'+up_limit_temp%10);

LcdWriteCom(0x80+0X40+2); //Cursor write back

}

}

}

if(limit_choise_num2) //Adjust the lower limit temperature

{

LcdWriteCom(0x80+0X40+12);

LcdWriteCom(0x0f); //Open the cursor

if(increase_temperature0) //Increase temperature

{

delay_ms(5);

if(increase_temperature0)

{

while(!increase_temperature);

down_limit_temp++;

if(down_limit_temp>=100)

{

down_limit_temp=0;

}

//Write new data

LcdWriteCom(0x80+0X40+0x0d);

LcdWriteData('0'+down_limit_temp/10);

LcdWriteCom(0x80+0X40+0x0e);

LcdWriteData('0'+down_limit_temp%10);

LcdWriteCom(0x80+0X40+12); //Cursor write back

}

}

if(reduce_temperature0) //Reduce temperature

{

delay_ms(5);

if(reduce_temperature==0)

{

while(!reduce_temperature);

down_limit_temp–;

if(down_limit_temp<0)

{

down_limit_temp=99;

}

//Write new data

LcdWriteCom(0x80+0X40+0x0d);

LcdWriteData('0'+down_limit_temp/10);

LcdWriteCom(0x80+0X40+0x0e);

LcdWriteData('0'+down_limit_temp%10);

LcdWriteCom(0x80+0X40+12); //Cursor write back

}

}

}

}

void unnormal_proccessing(uint temp,uint up_temp,uint down_temp) //constant temperature control function

{

uchar datas[] = {0, 0, 0, 0}; //define array

uint temp1=0;

datas[0] = temp % 10000 / 1000;

datas[1] = temp % 1000 / 100;

datas[2] = temp % 100 / 10;

datas[3] = temp % 10;

temp1=datas[0]*1000+datas[1]*100+datas[2]*10+datas[3]; //The actual temperature multiplied by 100

if(temp1 < down_temp*100) // Heating function

{

heating=0; //Heating

refrigerating=1; // No refrigeration

unnormal=0; //Abnormal temperature indicator light display

normal=1; //Normal temperature indicator light does not display

//Buzzer alarm

//warning=0;

//delay_ms(10);

//warning=1;

}

else if(temp1 > up_temp*100)//cooling function

{

heating=1;//No heating

refrigerating=0; // refrigeration

unnormal=0; //Abnormal temperature indicator light display

normal=1; //Normal temperature indicator light does not display

//Buzzer alarm

// warning=0;

//delay_ms(10);

// warning=1;

}

else//normal

{

heating=1;//No heating

refrigerating=1; // No refrigeration

unnormal=1; // Abnormal temperature indicator light does not display

normal=0; //Normal temperature indicator light display

//Buzzer does not alarm

// warning=1;

}

}

void Time0() interrupt 1

{

static u8 i;

TH0=0xB8; //11.0592M crystal oscillator timing 20ms

TL0=0x00;

i++;

if(i>=50) //1 second timeout

{

i=0;

Due to limited space, only part of the code can be written