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51 MCU project design: Based on 51 MCU clock perpetual calendar
2022-06-26 08:22:00 【Turn into dust】
List of articles
Bleep bleep video link ： https://www.bilibili.com/video/BV1EF411z7im/
The data link ： https://pan.baidu.com/s/1PkHsZd0ICn4OJIsMDl8BKA
Extraction code ：p49y
One 、 Project functions
1、 The current time can be displayed 、 week 、 date
2、 You can modify the current time 、 week 、 date
3、 The ambient temperature can be obtained , And display to LCD
4、 You can set the alarm clock , When the time comes, the buzzer will sound 、 Press the key to turn off the beep
Two 、 Material selection
（ One ） Master selection ：STC89C52RC
STC89C52 It is a low power consumption 、 High performance CMOS8 Bit microcontroller , have 8K In system programmable Flash Memory . On a single chip , Have dexterous 8 position CPU And in system programmability Flash, bring STC89C52 It provides high flexibility for many embedded control application systems 、 Super effective solution .
（ Two ） Display selection ：LCD1602
LCD1602 LCD is a widely used character LCD module . It is composed of character LCD （LCD）、 Control drive main circuit HD44780 And its extended driving circuit HD44100, And a small amount of resistance 、 Capacitor elements and structural members are assembled in PCB On the board . Made by different manufacturers LCD1602 The chip may be different , But the usage is the same . To reduce costs , Most manufacturers directly put the bare chip on the board .
（ 3、 ... and ） Clock chip selection ：DS1302
DS1302 It's the United States DALLAS The company has launched a small current charging capacity of low-power real-time clock chip . It can be used for years 、 month 、 Japan 、 Zhou 、 when 、 branch 、 Seconds to time , And it has many functions such as leap year compensation .
（ Four ） Temperature sensor selection ：DS18B20
DS18B20 It is a commonly used digital temperature sensor , Its output is a digital signal , Small size , Low hardware overhead , Strong anti-interference ability , Features of high precision . [1] DS18B20 The digital temperature sensor is easy to connect , The package can be used in many occasions , Such as pipe type , Screw type , Magnet adsorption type , Stainless steel package , There are many models , Yes LTM8877,LTM8874 wait .
（ 5、 ... and ） Peripheral devices ： Key 、 Buzzer 、 switch 、 The button battery 、 Potentiometer 、 Triode, etc
3、 ... and 、 Schematic design
（ One ） Minimum system
Power supply 、 Crystal oscillator 、 Reset circuit 
（ Two ） Display circuit
The data cable is connected to P0, Pay attention to connect 1K Pull up resistance 
（ 3、 ... and ） Clock chip circuit
3 Pins are connected to the single-chip microcomputer IO Mouth control 
（ Four ） Key circuit 
（ 5、 ... and ） Temperature sensor 
（ 6、 ... and ） Power circuit and power indication 
Four 、PCB Design
5、 ... and 、 Programming
/************************************************************************************** * project ：51 Single chip clock calendar design * author ： Turn into dust * edition ：V1.1 * mailbox ：[email protected] * Time ：2020 year 12 month 1 Japan 16:43:51 * Bili Bili video address :https://www.bilibili.com/video/BV1VQ4y1M79K * matters needing attention ： The alarm clock is designed according to the actual object , Can't simulate , It uses an internal eeprom ***************************************************************************************/
#include "reg52.h" // This file defines some special function registers of MCU
#include "ds1302.h"
#include "temp.h"
#include "lcd.h"
#include "eeprom.h"
sbit k1 = P1^0; // Key
sbit k2 = P1^1;
sbit k3 = P1^2;
sbit k4 = P1^3;
sbit lcdled = P2^4; //lcd Backlight
sbit beep = P1^4; // Buzzer
unsigned int ti=0,alarm=0; // Modify the time parameter 、 Modify the alarm clock parameters
unsigned char alarm_hour=0x12,alarm_min=0x00; // Alarm clock hour 、 Sub parameters
enum Mode // Define enumeration 、 Three models
{
DISPLAYDATA,MODIFYDATA,SETALARMCLOCK,NONE,ALARMCLOCK
}mode;
enum Alarmswitch // Define the alarm switch
{
OFF,ON
}alarmswitch;
/********* The time delay function ***********/
void delay(unsigned int t) // Short delay
{
while(t--);
}
void delay_ms(unsigned int t) // Millisecond delay
{
unsigned int a,b;
for(a=0;a<t;a++)
for(b=0;b<120;b++);
}
/******** Show date 、 Time 、 week ***********/
void display_data(void)
{
LcdWriteCom(0x80);
LcdWritestr("20");
LcdWriteData(TIME[6]/16+0x30); // year
LcdWriteData(TIME[6]%16+0x30);
LcdWriteData('-');
LcdWriteData(TIME[4]/16+0x30); // month
LcdWriteData(TIME[4]%16+0x30);
LcdWriteData('-');
LcdWriteData(TIME[3]/16+0x30); // Japan
LcdWriteData(TIME[3]%16+0x30);
LcdWritestr(" ");
switch(TIME[5]) // Show week
{
case 0:LcdWritestr("Mon"); break;
case 1:LcdWritestr("Tue"); break;
case 2:LcdWritestr("Wed"); break;
case 3:LcdWritestr("Thu"); break;
case 4:LcdWritestr("Fri"); break;
case 5:LcdWritestr("Sat"); break;
case 6:LcdWritestr("Sun"); break;
}
if(alarmswitch==ON)LcdWriteData('.');
else LcdWriteData(' ');
LcdWriteCom(0xC0);
LcdWriteData(' ');
LcdWriteData(TIME[2]/16+0x30); // when
LcdWriteData(TIME[2]%16+0x30);
LcdWriteData(':');
LcdWriteData(TIME[1]/16+0x30); // branch
LcdWriteData(TIME[1]%16+0x30);
LcdWriteData(':');
LcdWriteData(TIME[0]/16+0x30); // second
LcdWriteData(TIME[0]%16+0x30);
LcdWritestr(" ");
}
/********* Show the temperature ***********/
void displaytemp(int temp) // Show the temperature
{
float tp;
static char flag = 1;
if(temp< 0)
{
LcdWriteCom(0xca);
LcdWriteData('-');
temp=temp-1;
temp=~temp;
tp=temp;
temp=tp*0.0625*100+0.5;
}
else
{
LcdWriteCom(0xca);
LcdWriteData('+');
tp=temp;
temp=tp*0.0625*100+0.5;
}
if(flag)
{
flag =0;
temp = 2600;
}
if(temp==8500)
return ;
LcdWriteData(temp % 10000 / 1000 + 0x30);
LcdWriteData(temp % 1000 / 100 + 0x30);
LcdWriteData('.');
LcdWriteData(temp % 100 / 10 + 0x30);
LcdWriteData(temp % 10 + 0x30);
}
/******************************************************************************* * Letter Count name : keypros * The functionality : Key handling functions , Judge button K1 Whether to press *******************************************************************************/
void keypros() // Initial page key detection
{
if(k1 == 0) // Switch mode
{
delay(1000); // Eliminate jitter It's about 10ms
if(k1==0) // Judge whether the key is pressed again
{
mode+= 1;if(mode == 3)mode = DISPLAYDATA;
}
while(k1 == 0);
}
else if(k2 == 0) // Buzzer test
{
delay(1000); // Eliminate jitter It's about 10ms
if(k2==0) // Judge whether the key is pressed again
{
beep = !beep;
}
while(k2 == 0);
}
else if(k3 == 0) // Backlight test
{
delay(1000); // Eliminate jitter It's about 10ms
if(k3==0) // Judge whether the key is pressed again
{
lcdled = !lcdled;
}
while(k3 == 0);
}
else if(k4 == 0) // Backlight test
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4==0) // Judge whether the key is pressed again
{
alarmswitch=!alarmswitch;
}
while(k4 == 0);
}
}
/************* Modification time ************/
void modify(void)
{
static int time=0;
time++;
if(k1 == 0) // Switch mode
{
delay(1000); // Eliminate jitter It's about 10ms
if(k1==0) // Judge whether the key is pressed again
{
mode+= 1;if(mode == 3)mode = DISPLAYDATA;
}
while(k1 == 0);
}
else if(k2 == 0) // Select Modify parameter
{
delay(1000); // Eliminate jitter It's about 10ms
if(k2==0) // Judge whether the key is pressed again
{
ti++;
if(ti == 8)ti=0;
}
while(k2 == 0);
}
else if(k3 == 0 ||k4 == 0)
switch(ti) // Select enter to modify parameters
{
case 0:
if(k4==0 | k3==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4==0 | k3 ==0) // Judge whether the key is pressed again
{
TIME[0]=0;
}
while(k4 == 0 | k3==0);
}
break; //?
case 1:
if(k3==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k3 ==0) // Judge whether the key is pressed again
{
TIME[1]++;
if(TIME[1]%16 == 0x0a)
{
TIME[1] += 16;
TIME[1] &= 0xf0;
}if(TIME[1]==0x60)TIME[1]=0;
}
while(k3==0);
}
if(k4==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4 ==0) // Judge whether the key is pressed again
{
TIME[1]--;
if(TIME[1]%16==0x0f && TIME[1]!=0xff)
{
TIME[1] &= 0xf9;
}
if(TIME[1]==0xff)TIME[1]=0x59;
}
while(k4==0);
}
break; //?
case 2:
if(k3==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k3 ==0) // Judge whether the key is pressed again
{
TIME[2]++;
if(TIME[2]%16 == 0x0a)
{
TIME[2] += 16;
TIME[2] &= 0xf0;
}if(TIME[2]==0x24)TIME[2]=0;
}
while(k3==0);
}
if(k4==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4 ==0) // Judge whether the key is pressed again
{
TIME[2]--;
if(TIME[2]%16==0x0f && TIME[2]!=0xff)
{
TIME[2] &= 0xf9;
}
if(TIME[2]==0xff)TIME[2]=0x23;
}
while(k4==0);
}
break; //?
case 3:
if(k3==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k3 ==0) // Judge whether the key is pressed again
{
TIME[3]++;
if(TIME[3]%16 == 0x0a)
{
TIME[3] += 16;
TIME[3] &= 0xf0;
}if(TIME[3]==0x32)TIME[3]=0;
}
while(k3==0);
}
if(k4==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4 ==0) // Judge whether the key is pressed again
{
TIME[3]--;
if(TIME[3]%16==0x0f && TIME[3]!=0xff)
{
TIME[3] &= 0xf9;
}
if(TIME[3]==0xff)TIME[3]=0x31;
}
while(k4==0);
}
break; // Japan
case 4:
if(k3==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k3 ==0) // Judge whether the key is pressed again
{
TIME[4]++;
if(TIME[4]%16 == 0x0a)
{
TIME[4] += 16;
TIME[4] &= 0xf0;
}if(TIME[4]==0x13)TIME[4]=0;
}
while(k3==0);
}
if(k4==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4 ==0) // Judge whether the key is pressed again
{
TIME[4]--;
if(TIME[4]%16==0x0f && TIME[4]!=0xff)
{
TIME[4] &= 0xf9;
}
if(TIME[4]==0xff)TIME[4]=0x12;
}
while(k4==0);
}
break; // month
case 5:
if(k3==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k3 ==0) // Judge whether the key is pressed again
{
TIME[5]++;if(TIME[5]==7)TIME[5]=0;
}
while(k3==0);
}
if(k4==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4 ==0) // Judge whether the key is pressed again
{
TIME[5]--;if(TIME[5]==0xff)TIME[5]=6;
}
while(k4==0);
}
break; // Zhou
case 6:
if(k3==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k3 ==0) // Judge whether the key is pressed again
{
TIME[6]++;
if(TIME[6]%16 == 0x0a)
{
TIME[6] += 16;
TIME[6] &= 0xf0;
}if(TIME[6]==0xa0)TIME[6]=0;
}
while(k3==0);
}
if(k4==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4 ==0) // Judge whether the key is pressed again
{
TIME[6]--;
if(TIME[6]%16==0x0f && TIME[6]!=0xff)
{
TIME[6] &= 0xf9;
}
if(TIME[6]==0xff)TIME[6]=0x99;
}
while(k4==0);
}
break; // year
case 7:
if(k3==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k3 ==0) // Judge whether the key is pressed again
{
mode=DISPLAYDATA;
ti=0;
}
while(k3==0);
}
if(k4==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4 ==0) // Judge whether the key is pressed again
{
Ds1302Init(); // Clock initialization
mode = DISPLAYDATA; // Return date
ti = 0; // Restore initial changes
}
while(k4==0);
}
break; // year
}
if(time == 200)
{
display_data();
if(ti == 7){
LcdWriteCom(0xca);
LcdWritestr(" <- OK");
}
}
else if(time == 400)
switch(ti) // Select enter to modify parameters
{
case 0:
LcdWriteCom(0xc7);
LcdWritestr(" ");
break;
case 1:
LcdWriteCom(0xc4);
LcdWritestr(" ");
break;
case 2:
LcdWriteCom(0xc1);
LcdWritestr(" ");
break;
case 3:
LcdWriteCom(0x88);
LcdWritestr(" ");
break;
case 4:
LcdWriteCom(0x85);
LcdWritestr(" ");
break;
case 5:
LcdWriteCom(0x8c);
LcdWritestr(" ");
break;
case 6:
LcdWriteCom(0x80);
LcdWritestr(" ");
break;
case 7:
LcdWriteCom(0xca);
LcdWritestr(" ");
break;
}else if(time>400) time=0;
delay_ms(1);
}
void setalarmclock(void) // Set the alarm mode
{
static int time=0;
time++;
if(k1 == 0) // Switch mode
{
delay(1000); // Eliminate jitter It's about 10ms
if(k1==0) // Judge whether the key is pressed again
{
mode+= 1;if(mode == 3)mode = DISPLAYDATA;
}
while(k1 == 0);
}
if(k2 == 0) // Select alarm clock to modify parameters
{
delay(1000); // Eliminate jitter It's about 10ms
if(k2==0) // Judge whether the key is pressed again
{
alarm++;
if(alarm == 3)alarm=0;
}
while(k2 == 0);
}
switch(alarm) // Select enter to modify parameters
{
case 0:
if(k3 == 0) // Control the alarm clock on
{
delay(1000); // Eliminate jitter It's about 10ms
if(k3==0) // Judge whether the key is pressed again
{
alarmswitch = ON;
SectorErase(0x2401);
byte_write(0x2401,alarmswitch);
}
while(k3 == 0);
}
if(k4 == 0) // Control the alarm clock to turn off
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4==0) // Judge whether the key is pressed again
{
alarmswitch = OFF;
SectorErase(0x2401);
byte_write(0x2401,alarmswitch);
}
while(k4 == 0);
}
break;
case 1:
if(k3==0) // Control the alarm clock to increase
{
delay(1000); // Eliminate jitter It's about 10ms
if(k3 ==0) // Judge whether the key is pressed again
{
alarm_hour++;
if(alarm_hour%16 == 0x0a)
{
alarm_hour += 16;
alarm_hour &= 0xf0;
}if(alarm_hour==0x24)alarm_hour=0;
SectorErase(0x2601);
byte_write(0x2601,alarm_hour);
}
while(k3==0);
}
if(k4==0) // Control the alarm clock to decrease
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4 ==0) // Judge whether the key is pressed again
{
alarm_hour--;
if(alarm_hour%16==0x0f && alarm_hour!=0xff)
{
alarm_hour &= 0xf9;
}
if(alarm_hour==0xff)alarm_hour=0x23;
SectorErase(0x2601);
byte_write(0x2601,alarm_hour);
}
while(k4==0);
}
break;
case 2:
if(k3==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k3 ==0) // Judge whether the key is pressed again
{
alarm_min++;
if(alarm_min%16 == 0x0a)
{
alarm_min += 16;
alarm_min &= 0xf0;
}if(alarm_min==0x60)alarm_min=0;
SectorErase(0x2201);
byte_write(0x2201,alarm_min);
}
while(k3==0);
}
if(k4==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4 ==0) // Judge whether the key is pressed again
{
alarm_min--;
if(alarm_min%16==0x0f && alarm_min!=0xff)
{
alarm_min &= 0xf9;
}
if(alarm_min==0xff)alarm_min=0x59;
SectorErase(0x2201);
byte_write(0x2201,alarm_min);
}
while(k4==0);
}
break;
}
if(time == 200)
{
alarm_hour=byte_read(0x2601);
alarm_min=byte_read(0x2201);
alarmswitch=byte_read(0x2401);
LcdWriteCom(0x80); // Show
LcdWritestr("alarm clock: ");
LcdWriteCom(0xc0);
if(alarmswitch == OFF)LcdWritestr(" OFF ");
else LcdWritestr(" ON ");
LcdWriteCom(0xc9);
LcdWriteData(alarm_hour/16+0x30);
LcdWriteData(alarm_hour%16+0x30);
LcdWriteData(':');
LcdWriteData(alarm_min/16+0x30);
LcdWriteData(alarm_min%16+0x30);
LcdWritestr(" ");
} else if(time == 400)
switch(alarm) // Select enter to modify parameters
{
case 0:
LcdWriteCom(0xc0);
LcdWritestr(" ");
break;
case 1:
LcdWriteCom(0xc9);
LcdWritestr(" ");
break;
case 2:
LcdWriteCom(0xcc);
LcdWritestr(" ");
break;
}else if(time>400) time=0;
delay_ms(1);
}
/************ Alarm mode *****************/
void alarmclock(void)
{
if(alarmswitch==ON && alarm_hour==TIME[2] && alarm_min==TIME[1]) // alarm clock
{
beep=1;
delay_ms(100);
beep=0;
delay_ms(100);
beep=1;
delay_ms(100);
beep=0;
LcdWriteCom(0x80);
LcdWritestr(" time out! ");
LcdWriteCom(0xc0);
LcdWritestr("now time: ");
LcdWriteData(alarm_hour/16+0x30);
LcdWriteData(alarm_hour%16+0x30);
LcdWriteData(':');
LcdWriteData(alarm_min/16+0x30);
LcdWriteData(alarm_min%16+0x30);
LcdWritestr(" ");
delay_ms(500);
LcdClean();
}
else mode=DISPLAYDATA;
if(k4==0)
{
delay(1000); // Eliminate jitter It's about 10ms
if(k4 ==0) // Judge whether the key is pressed again
{
alarmswitch=OFF;
}
while(k4==0);
}
}
/******************************************************************************* * Letter Count name : main * The functionality : The main function * transport Enter into : nothing * transport Out : nothing *******************************************************************************/
void main(void)
{
int ucount=0;
unsigned char lastSec;
beep= 0;
LcdInit(); //lcd initialization
//Ds1302Init(); // Clock initialization
Ds18b20Init(); // Temperature sensor initialization
SectorErase(0x2001);
// byte_write(0x2001,0x08); // Perform one initialization
// byte_write(0x2201,0x00);
// byte_write(0x2401,0x00);
alarm_hour=byte_read(0x2601);
alarm_min=byte_read(0x2201);
alarmswitch=byte_read(0x2401);
while(1)
{
switch(mode) // Mode selection
{
case DISPLAYDATA: // Time display mode
Ds1302ReadTime(); // Update time
if(TIME[0] != lastSec)
{
lastSec = TIME[0];
display_data(); // Display time Second minute hour Sun Moon anniversary
displaytemp(Ds18b20ReadTemp());// Show the temperature
if(alarmswitch==ON && alarm_hour==TIME[2] && alarm_min==TIME[1]) // alarm clock
{
mode = ALARMCLOCK;
}
}
keypros(); // Key detection
break;
case MODIFYDATA: // Time modification mode
modify();
break;
case SETALARMCLOCK: // Set the alarm mode
setalarmclock();
break;
case ALARMCLOCK: // Alarm mode
alarmclock();
break;
}
}
}
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