Цифровые часы на rtc ds12c887 и 8051

Digital Clock using 8051 Microcontroller

In this project, we are going to demonstrate making a RTC Clock using 8051 microcontroller.  If you would like to do this project with Arduino, check this digital clock using Arduino. The major component of this project is DS1307 which is a real time digital clock IC. Lets know about this IC in detail. 

RTC DS1307:

The DS1307 serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. This chip works on I²C protocol. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information.

The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The DS1307 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply.

Timekeeping operation continues while the part operates from the backup supply. DS1307 chip can continuously run till 10 year.

8051 based Real time clock is a digital clock to display real time using a RTC DS1307, which works on I2C protocol. Real time clock means it runs even after power failure.

When power is reconnected, it displays the real time irrespective to the time and duration it was in off state. In this project we have used a 16×2 LCD module to display the time in – (hour, minute, seconds, date, month and year) format.

Real time clocks are commonly used in our computers, houses, offices and electronics device for keeping them updated with real time.

I2C protocol is a method to connect two or more devices using two wires to a single system, and so this protocol is also called as two wire protocol. It can be used to communicate 127 devices to a single device or processor. Most of I2C devices run on 100Khz frequency.

Steps for data write master to slave (slave receiving mode)

  1. Sends START condition to slave.
  2. Sends slave address to slave.
  3. Send write bit (0) to slave.
  4. Received ACK bit from slave
  5. Sends words address to slave.
  6. Received ACK bit from slave
  7. Sends data to slave.
  8. Received ACK bit from slave.
  9. And last sends STOP condition to slave.

Steps for data reading from slave to master (slave transmitting mode)

  1. Sends START condition to slave.
  2. Sends slave address to slave.
  3. Send read bit (1) to slave.
  4. Received ACK bit from slave
  5. Received data from slave
  6. Received ACK bit from slave.
  7. Sends  STOP condition to slave.

Circuit Diagram and Description

In circuit we have used 3 most components DS1307, AT89S52 and LCD. Here AT89S52 is used for reading time from DS1307 and display it on 16×2 LCD screen. DS1307 sends time/date using 2 lines to the microcontroller.

Circuit connections are simple to understand and shown in the above diagram. DS1307 chip pin SDA and SCL are connected to P2.1 and P2.0 pins of 89S52 microcontroller with pull up resistor that holds default value HIGH at data and clock lines. And a 32.

768KHz crystal oscillator is connected with DS1307chip for generating exact 1 second delay. And a 3 volt battery is also connected to pin 3rd (BAT) of DS1307 which keeps time running after electricity failure. 16×2 LCD is connected with 8051 in 4-bit mode. Control pin RS, RW and En are directly connected to 89S52 pin P1.

0, GND and P1.1. And data pin D0-D7 is connected to P1.4-P1.7 of 89S52.

Three buttons namely SET, INC/CHANGE and Next are used for setting clock time to pin P2.4, P2.3 and P2.2 of 89S52 (active low). When we press SET, time set mode activates and now we need to set time by using INC/CHANGE button and Next button is used for moving to digit. After setting time clock runs continuously.

Program Description

In code we have included 8051 family library and a standard input output library. And defined pins that we have used, and taken some variable for calculations.

#include
#include
#define lcdport P1 sbit rs=P1^0;
sbit en=P1^1; sbit SDA=P2^1; sbit SCL=P2^0; sbit next=P2^2; //increment digit
sbit inc=P2^3; //increment value
sbit set=P2^4; //set time char ack;
unsigned char day1=1;
unsigned char k,x;
unsigned int date=1, mon=1, hour=0, min=0, sec=0;
int year=0; void delay(int itime)
{ int i,j; for(i=0;i

Источник: https://circuitdigest.com/microcontroller-projects/digital-clock-using-8051-microcontroller

Digital Clock Circuit using 8051 Microcontroller and DS12C887

Digital clock displays the time using numbers. This circuit is used in many applications like cars, railway stations, houses, offices, etc. in order to provide accurate time and date.

In this type of applications, normally we use RTC (Real Time Clock) ICs to display the time and date accurately. This circuit displays the time on LCD. For this clock, we can set the time at any instant.

Here the clock works in 24 hour mode and the RTC chip is configured by programming 8051 controller.

Circuit Principle:

Here 8051 controller continuously reads the data from Real time clock and process it in correct order to display the time on LCD. INT1 of the 8051 controller is used to set the time to the digital clock. If you make P3.

3 pin LOW then interrupt arises and set_time function is called to set the time. To set the time to the clock use P1.4 and P1.5 pins. P1.4 is used to vary the hours and P1.5 is used to vary the minutes. After setting the time make P1.

6 high to run the clock with the time set by user.

Related Post: [Digital Stopwatch Circuit]

Circuit Diagram:

Circuit Diagram of Digital Clock using RTC DS12C887 and 8051 Microcontroller

Circuit Components:

  • 8051 microcontroller
  • Project PCB
  • Programming cable
  • DC Battery or 12V, 1A adaptor
  • DS12C887 RTC IC
  • 16*2 alphanumeric LCD
  • Push buttons – 4
  • Slide switches – 3
  • 2 ceramic capacitors – 33pF
  • 12 MHz crystal
  • Electrolytic capacitor – 10uF, 16V
  • Resistor (1/4 watt) – 10k
  • Pot – 10k
  • 5V DC power supply circuit
  • Single pin connecting wires

Circuit Design:

The circuit shows you how interface RTC IC to the 8051 controller. Port P0 is used as a data port of Real time clock.  Port P2 of controller is connected to the data pins of LCD. Pins P1.1, P1.2 and P1.3 of controller are connected to the RS, RW, EN pins respectively.

P1.0 is connected to the RESET of RTC. Push buttons are connected to the P1.4 and P1.5. These are used set the time. P1.6 is configured as START pin used to run the clock with time set by the user. P3.3 is connected to the push button used to call the set_time function.

DS12C887 Real Time Clock:

This IC is used most of the applications to provide accurate time and date. This IC provides the time in both 12 hour mode and 24 hour mode. This IC also provides calendar components day, month and year.

This RTC uses internal lithium battery to keep the time and date updated when power is failed. This IC has 128 bytes of RAM memory. In these 128 bytes of RAM 14 bytes are used for time, date and registers.

Remaining 114 bytes are used to store general purpose data.

The control registers of RTC are accessible only when the power is applied from external source. This IC requires more than 4.25V power supply and the control registers are accessible after 200ms when external power is supplied.

DS12C887 IC

Pin Description:

  • MOT: It is a bus type selection pin used to select between Intel and Motorolabus types. This pin is connected to VCC to select Motorola bus type and connected to GND or unconnected to select Intel bus type.
  • 2, 3: Unused pins
  • 4 – 11 (AD0 – AD7): These pins are bidirectional address and data lines of RTC. On these pins address is present in the first portion of cycle and data is present in the second portion of bus cycle.
  • 12 (GND): This pin is connected to Ground.
  • 13 (CS): This pin must be low to access the chip during read and write operations.
  • 14 (AS): The high pulse on this pin is used to demultiplex the data and address.
  • 15 (R/W): This pin is used for read or writes operations.
  • 16: Unused pin
  • 17 (DS): This is a Data Strobe pin.
  • 18 (RESET): The low pulse on this pin resets all the flags and interrupts but it does not affects time and date.
  • 19 (IRQ): Thisis active low pin used as an interrupt input to the controller.
  • 20 – 22: Unused pins
  • 23 (SQW): Used to generate square wave with predefined frequencies
  • 24 (VCC): This pin is connected 5V supply

RTC Address Map:

This RTC has 128 bytes of RAM with addresses 00H – 07H. The first ten locations (00 – 09) are used for clock, calendar and alarm data. 0A – 0D address locations are used for status and control registers. Remaining address locations are used to for general data. The following table shows the address locations for clock, calendar and alarm.

Address Locations for Time, Date and Alarm

This IC has 4 control and status registers namely register A, register B, Register C, register D. We need to configure all these registers to get the accurate time and date. In order to configure these registers go through the DS12C887 Datasheet

How to Operate?

  1. Initially burn the program to the 8051 microcontroller
  2. Now give the connections as per the circuit diagram
  3. Switch on the board supply
  4. Now you can observe the time on LCD.

    If you want to set the time make the start pin low and press the push button connected to the P3.3

  5. LCD shows set time message. Now use push button which is connected to P1.4 to set hours and use other push button to set minutes.

  6. Now make start pin high to run the clock.

Circuit Applications:

  • This project is used in offices, houses, hotels and auto mobiles to display the time and date.
  • We can also set the alarm in this project with a little modification.

Download Project Code

Источник: https://www.electronicshub.org/digital-clock-circuit-using-8051-and-ds12c887/

Набор для самостоятельной сборки матричных часов на DS3231

  • Магазины Китая
  • BANGGOOD.COM
  • Часы и таймеры
  • Сделано руками
  • Пункт №18

Приветствую! Представляю обзор отличного DIY набора для сборки часов на светодиодных матрицах.

Основой для них служит RTC DS3231 и китайский микроконтроллер stc15w1k24s. Набор очень качественный, собирается легко и приятно, итог выглядит отлично. Подробности, фото и видео далее.

Ну, поехали!

Ссылка на мануал

Набор приехал защищенный от трудностей и опасностей почтовой доставки.Убираем, смотрим дальше.Теперь познакомимся с содержимым поближе. Содержимое пакетаКорпус — две пластины акрила, защищенный от царапин пленкой.МатрицыСлегка гнутые ноги, но ничего страшного, металл мягкий — выпрямляется легко

Судя по информации с али в данном наборе матрицы с общим анодом.

«3117A (общий катод) 3117B (общий анод) „ Кабель USB-miniUSB, обычный. Длина около метра.Плата. Текстолитовая, двусторонняя, с маской, переходными отверстиями. Отличного качества.Детальё и болты с гайкамиПанелька для литиевой батарейки CR1220. Выбор такого непопулярного размера обусловлен небольшим размером самих часов.Контроллер STC 15w1k24s, инфы практически нет, единственное упоминание на паяльнике что это китайский аналог AVR контроллеров.

DS3231 Сверхточные RTC со встроенными I2C интерфейсом, TCXO и резонатором с температурной компенсацией. Крутая микруха))

Упакованы обе микросхемы вот в такой блистер. Очень жесткий кстати, попортить содержимое весьма сложно.Болтики, гайкиРтутный выключатель (датчик наклона)КонденсаторыПара транзисторов 9012, стабилизатор AMS1117 3.3v, smd конденсаторы (0.1uF) и резисторы (10K), кнопки и разъем.И пищалкаНачнем собирать. Собирать решил как в мануале. Сначала разъем.

В этот раз я решил паять с недорогой флюс-пастой, проверить на SMD и микросхемах. Паста вот такаяПаять очень удобно, паста годная несмотря на то что дешевая.

Не реклама))) Намазал площадки на платеЗалудил ноги разъемаПоставил на платуЗапаялТеперь контроллерМажемПозиционируемПрижимаемПрихватываем крайние ноги, чтоб не уползЗапаиваем все остальноеТеперь DS3231Стабилизатор AMS1117 3.3vТеперь конденсаторы.Т.к. ноги большей частью находятся под кондерами, то я решил нанести на них припой, дабы припаять по всей длине.

Теперь SMDНа данном этапе хорошо бы запаять все остальные SMD элементы, но я затупил и пропустил их. В общем сейчас надо паять транзистор, иначе потом будет неудобно. Панелька.МажемПаяемКнопки. Вообще кнопки желательно паять после мытья всей платы. Но запаяю сейчас, потом мыть буду аккуратнее.Пищалка Вставляем. Не забываем полярностьЗапаиваем.

Откусываем ноги, а то матрицы потом не станут.Вспомнил про транзистор))Теперь датчик наклонаОткусываемПрипаиваемРезисторыУдерживаю пинцетом запаиваю у всех одну сторонуПотом быстро с проволочкой вторуюБерем матрицыВставляем маркировкой вверхПереворачиваемБерем проволоку припоя и не напрягаясь запаиваем. Плату во время пайки прижимаем к матрицам.

ВсеВключаемВсе работает. Цифры такие из-за короткой выдержки.Осталось два резистора, транзистор и конденсатор. Так что можно во время сборки немного потерять))Собрал не торопясь часа за полтора. Собирать приятно, проблем не выявлено. Все отмыл.

Немного фото.

Теперь соберем “корпус»Ах да, нужно же еще вставить батарейку. CR1220 найти оказалось проблематично, так что вставил 1216 — контачит нормально.В рабочем состоянииФото с большими матричными часамиНу и видео-демонстрация. Видео без звука — на фоне периодически что-то кричали дети, а музыку накладывать не стал.Итог: очень качественный и классный набор. Собирать не сложно и приятно. В итоге получаются красивые и интересные часы. Несколько режимов бегущей строки и разделительной точки. Будильник и календарь. Температура (из DS3231). Возможность ставить с ног на голову и наоборот)). Возможность запаять питание напрямую, без использования miniUSB. Есть еще чисто китайские фишки — указание китайских праздников, рождества, нового года и еще каких-то. Из недостатков неравномерная яркость, заметно только вблизи. Неизвестный китайский контроллер и отсутствие возможности редактировать прошивку. В остальном просто отличный набор, рекомендую!

Источник: https://mysku.me/blog/china-stores/42282.html

8051 Microcontroller Pin Diagram Description Pdf Digital Clock using RTC DS12C887 and 8051 Microcontroller. … It is a bus type. home appliances controle system, Automatic room light controller, 8051 Coding in c, … Interfacing LED Dot Matrix with 8051 Microcontroller ..

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Источник: https://documents.tips/documents/8051-microcontroller-pin-diagram-description-pdf-digital-clock-using-rtc-ds12c887.html

Digital Clock Using 8051 – Electronics Maker

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A digital clock keeps track of the time and uses RTC(real Time Clock).The time is displayed on the LCD, which is connected to Port 2.The RTC used is DS12887 and the controller used is 89v51RD2.Three switches acts as a input for seconds, minutes and hours.

The above circuit is build on proteus and crystal frequency has been internally set. The connection of the RTC DS12C887 with the microcontroller is shown in the circuit diagram.It uses update interrupt to keep the track of the time. Every time the update interrupt comes, the clock is incremented by one second. The output is displayed on the LCD.

The clock uses external interrupt 2 of the microcontroller AT89C51 for setting the time. A user can set time by pressing the switch connected to pin 13 of the microcontroller, which is interrupt 2. The hour and minutes can be set using pin 5 and pin 6 of the controller AT89C51 respectively.

Once the time is set, the user needs to press the start pin (pin 8 of controller) to start the clock.

The component used are 8051

The main features of 8051 microcontroller are: i. RAM – 128 Bytes (Data memory) ii. ROM – 4Kbytes (ROM signify the on – chip program space) iii. Serial Port – Using UART makes it simpler to interface for serial communication. iv.

Two 16 bit Timer/ Counter v. Input/output Pins – 4 Ports of 8 bits each on a single chip. vi. 6 Interrupt Sources vii. 8 – bit ALU (Arithmetic Logic Unit) viii.

Harvard Memory Architecture – It has 16 bit Address bus (each of RAM and ROM) and 8 bit Data Bus.

ix. 8051 can execute 1 million one-cycle instructions per second with a clock frequency of 12MHz.

DS12887 RTC

The real-time clock (RTC) is a widely used device that provides accurate time and date for many applications. It provides time components of hour, minute, and second, in addition to the date/calendar components of year, month, and day.

The RTC chip uses an internal battery, which keeps the time and date even when the power is off. One of the most widely used RTC chips is the DS 12887 from Dallas Semiconductor/Maxim Corp. The DS 12887 supports both 12-hour and 24-hour clock modes with AM and PM in the 12-hour mode.

It also supports the Daylight Savings Time option. The DS 12887 uses CMOS technology to keep the power consumption low and it has the designation DS12C887, where C is for CMOS. The DS12887 has a total of 128 bytes of nonvolatile RAM.

It uses 14 bytes of RAM for clock/calendar and control registers, and the other 114 bytes of RAM are for general-purpose data storage. Pins of DS12887

Vcc

Pin 24 provides external supply voltage to the chip. The external voltage source is +5V. When VC9 falls below the 3V level, the external source is switched off and the internal lithium battery provides power to the RTC.

GND

Pin 12 is the ground.

ADO-AD7

The multiplexed address/data pins provide both addresses and data to the chip. Addresses are latched into the DS 12887 on the falling edge of the AS (ALE) signal. ADO – AD7 of the DS 12887 are connected directly to the 8051 and there is no need for any 74xx373 latches, since the DS 12887 provides the latch internally.

AS (ALE)

AS (address strobe) is an input pin. On the falling edge it will cause the addresses to be latched into the DS 12887. The AS pin is used for demultiplexing the address and data and is connected to the ALE pin of the 8051 chip.

MOT

This is an input pin that allows the choice between the Motorola and Intel microcontroller bus timings. The MOT pin is connected to GND for the Intel timing. That means when we connect DS 12887 the 8051, MOT = GND.

DS

Data strobe or read is an input. When MOT = GND for Intel timing, the DS pin is called the RD (read) signal and is connected to the RD pin of the 8051.

R/W

Read/Write is an input pin. When MOT = GND for the Intel timing, the R/W pin is called the WR (write) signal and is connected to the WR pin of the 8051.

CS

Chip select is an input pin and an active low signal. During the read (RD) and write (WR) cycle time of Intel timing, the CS must be low in order to access the chip. It must be noted that the CS works only when the external Vcc is connected. In other words “when Vcc falls below 4.25V, the chip-select input is internally forced to an inactive level regardless of the value of CS at the input pin.” This is called the write-protected state. When the DS 12887 is in write-protected state, all inputs are ignored.

IRQ

Interrupt request is an output pin and active low signal. To use IRQ, the interrupt-enable bits in register B must be set high.

SQW

Square wave is an output pin. We can program the DS 12887 to provide up to 15 different square waves. The frequency of the square wave is set by programming register A RESET

Pin 18 is the reset pin. It is an input and is active low (normally high). In most applications the reset pin is connected to the Vcc pin. In applications where this pin is used, it has no effect on the clock, calendar, or RAM if it is forced low. The low on this pin will cause the reset of the IRQ and clearing of the SQW pin.

Address map of the DS12887

The DS12887 has a total of 128 bytes of RAM space with addresses 00 -7FH. The first ten locations, 00 – 09, are set aside for RTC values of time, calendar, and alarm data. The next four bytes are used for the control and status registers.

They are registers A, B, C, and D and are located at addresses 10-13 (OA – OD in hex). Notice that their hex addresses match their names. The next 114 bytes from addresses OEH to 7FH are available for data storage.

The entire 128 bytes of RAM are accessible directly for read or write except the following: 1) Registers C and D are read-only. 2) D7 bit of register A is read-only.

3) The high-order bit of the seconds byte is read-only.

Источник: http://electronicsmaker.com/em/admin/pdf/free/digital-clock.pdf

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Digital Clock With Rtc Ds12c887 8051 Microcontroller Project

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