arduino real time clock ds3231 with lcd display made in china

DS3231 real time clock module features high accuracy and low power consumption. This RTC module maintains seconds, minutes, hours, day, date, month, and year information. In this module, the date is set based on whether the month is 29, 30 or 31 days, and also whether it is leap year or not. This module can be used in 12-hour and 24-hour formats.

The DS3231 module is available in two different types on the market. There is actually no difference between the two types in terms of functionality and operation, and only the appearance and pin assignments are different.

From this part, everything is the same for both types of the DS3231 RTC module. Download the DS3231_library from the link below. Then, go to “Include Library” and install it.

In this code, first, the time information including second, minute, day, month, year and century are set as the starting point and the module starts working and is updated every second. Then, every second, the information is received from the module and displayed in the Serial Monitor.

Z:\Arduino\Sketch Kühlschrank\Set_DS3231\RTCTFT160\RTCTFT160.ino:124:7: note: ‘void printText(char*, uint16_t, int, int, int)’ previously defined here

In this Arduino Tutorial we will learn how to use the DS3231 Real Time Clock Module. You can watch the following video or read the written tutorial below.

The first question that comes here is why we actually need a separate RTC for our Arduino Project when the Arduino itself has built-in timekeeper. Well the point is that the RTC module runs on a battery and can keep track of the time even if we reprogram the microcontroller or disconnect the main power.

The DS3231 is a low-cost, highly accurate Real Time Clock which can maintain hours, minutes and seconds, as well as, day, month and year information. Also, it has automatic compensation for leap-years and for months with fewer than 31 days.

Once we connect the module we need to program the Arduino Board to work with the Real Time Clock. However, when it comes to programing a communication between Arduino and an I2C module the code isn’t that small and easy. Luckily, there are already several libraries for the DS3231 RTC which can be found on the internet.

So once we download and install the library we can use its first demo example to initially activate the clock of the RTC module. In the setup section of the demo example code we can notice that there are three line that we need to uncomment in order to initially set the day of the week, the time and the data.

The first line is for setting the day of the week, the second line is for setting the time in hours, minutes and seconds, and the third line is for setting the date in days, months and years.

Now even if we disconnect the Arduino power and then reconnect it and run the Serial Monitor again we can notice that the time keeps going without being reset.

So now we have our Real Time Clock up and running and we can use in any Arduino Project. As a second example I connected an LCD to the Arduino and printed the time and the date on it.

Although the term often refers to the devices in personal computers, servers and embedded systems, RTCs are present in almost any electronic device which needs to keep accurate time of day.

The term real-time clock is used to avoid confusion with ordinary hardware clocks which are only signals that govern digital electronics, and do not count time in human units. RTC should not be confused with real-time computing, which shares its three-letter acronym but does not directly relate to time of day.

A GPS receiver can shorten its startup time by comparing the current time, according to its RTC, with the time at which it last had a valid signal.ephemeris is still usable.

Some motherboards are made without real time clocks. The real time clock is omitted either out of the desire to save money (as in the Raspberry Pi system architecture) or because real time clocks may not be needed at all (as in the Arduino system architecture

RTCs often have an alternate source of power, so they can continue to keep time while the primary source of power is off or unavailable. This alternate source of power is normally a lithium battery in older systems, but some newer systems use a supercapacitor,soldered. The alternate power source can also supply power to battery backed RAM.

Most RTCs use a crystal oscillator,power line frequency.quartz clocks and watches. Being exactly 215 cycles per second, it is a convenient rate to use with simple binary counter circuits. The low frequency saves power, while remaining above human hearing range. The quartz tuning fork of these crystals does not change size much from temperature, so temperature does not change its frequency much.

Typical crystal RTC accuracy specifications are from ±100 to ±20 parts per million (8.6 to 1.7 seconds per day), but temperature-compensated RTC ICs are available accurate to less than 5 parts per million.celestial navigation, the classic task of a chronometer. In 2011, chip-scale atomic clocks became available. Although vastly more expensive and power-hungry (120 mW vs. <1 μW), they keep time within 50 parts per trillion (5×10−11).

Some modern computers receive clock information by digital radio and use it to promote time-standards. There are two common methods: Most cell phone protocols (e.g. LTE) directly provide the current local time. If an internet radio is available, a computer may use the network time protocol. Computers used as local time servers occasionally use GPSradio clock

The following system is well-known to embedded systems programmers, who sometimes must construct RTCs in systems that lack them. Most computers have one or more hardware timers that use timing signals from quartz crystals or ceramic resonators. These have inaccurate absolute timing (more than 100 parts per million) that is yet very repeatable (often less than 1 ppm). Software can do the math to make these into accurate RTCs. The hardware timer can produce a periodic interrupt, e.g. 50 Hz, to mimic a historic RTC (see below). However, it uses math to adjust the timing chain for accuracy:

When the "time" variable exceeds a constant, usually a power of two, the nominal, calculated clock time (say, for 1/50 of a second) is subtracted from "time", and the clock"s timing-chain software is invoked to count fractions of seconds, seconds, etc. With 32-bit variables for time and rate, the mathematical resolution of "rate" can exceed one part per billion. The clock remains accurate because it will occasionally skip a fraction of a second, or increment by two fractions. The tiny skip ("jitter") is imperceptible for almost all real uses of an RTC.

The complexity with this system is determining the instantaneous corrected value for the variable "rate". The simplest system tracks RTC time and reference time between two settings of the clock, and divides reference time by RTC time to find "rate". Internet time is often accurate to less than 20 milliseconds, so 8000 or more seconds (2.2 or more hours) of separation between settings can usually divide the forty milliseconds (or less) of error to less than 5 parts per million to get chronometer-like accuracy. The main complexity with this system is converting dates and times to counts of seconds, but methods are well known.

If the RTC runs when a unit is off, usually the RTC will run at two rates, one when the unit is on and another when off. This is because the temperature and power-supply voltage in each state is consistent. To adjust for these states, the software calculates two rates. First, software records the RTC time, reference time, on seconds and off seconds for the two intervals between the last three times that the clock is set. Using this, it can measure the accuracy of the two intervals, with each interval having a different distribution of on and off seconds. The rate math solves two linear equations to calculate two rates, one for on and the other for off.

Another approach measures the temperature of the oscillator with an electronic thermometer, (e.g. a thermistor and analog-to-digital converter) and uses a polynomial to calculate "rate" about once per minute. These require a calibration that measures the frequency at several temperatures, and then a linear regression to find the equation of temperature. The most common quartz crystals in a system are SC-cut crystals, and their rates over temperature can be characterized with a 3rd-degree polynomial. So, to calibrate these, the frequency is measured at four temperatures. The common tuning-fork-style crystals used in watches and many RTC components have parabolic (2nd-degree) equations of temperature, and can be calibrated with only 3 measurements. MEMS oscillators vary, from 3rd degree to fifth degree polynomials, depending on their mechanical design, and so need from four to six calibration measurements. Something like this approach might be used in commercial RTC ICs, but the actual methods of efficient high-speed manufacturing are proprietary.

Some computer designs such as smaller IBM System/360s,PDP-8sNovas used a real-time clock that was accurate, simple and low cost. In Europe, North America and some other grids, the frequency of the AC mains is adjusted to the long-term frequency accuracy of the national standards. In those grids, clocks using AC mains can keep perfect time without adjustment. Such clocks are not practical in portable computers or grids (e.g. in South Asia) that do not regulate the frequency of AC mains.

These computers" power supplies use a transformer or resistor divider to produce a sine wave at logic voltages. This signal is conditioned by a zero crossing detector, either using a linear amplifier, or a schmitt trigger. The result is a square wave with single, fast edges at the mains frequency. This logic signal triggers an interrupt. The interrupt handler software usually counts cycles, seconds, etc. In this way, it can provide an entire clock and calendar. In the IBM 360, the interrupt updates a 64-bit count of microseconds utilized by standardized systems software. The clock"s jitter error is half if the clock interrupts for each zero crossing, instead of each cycle.

The clock also usually formed the basis of computers" software timing chains; e.g. it was usually the timer used to switch tasks in an operating system. Counting timers used in modern computers provide similar features at lower precision, and may trace their requirements to this type of clock. (e.g. in the PDP-8, the mains-based clock, model DK8EA, came first, and was later followed by a crystal-based clock, DK8EC.)

A software-based clock must be set each time its computer is turned on. Originally this was done by computer operators. When the Internet became commonplace, network time protocols were used to automatically set clocks of this type.

"Real-time Clock/Complementary Metal Oxide Semiconductor (RT/CMOS) RAM Information". IBM PC AT Technical Reference (PDF). International Business Machines Corporation. 1984. p. System Board 1–45.

DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, disconnects the main power supply and maintains accurate timekeeping. Integrated oscillator improve long-term accuracy of the device

RTC maintains seconds, minutes, hours, day, date, month, and year information. Less than 31 days of the month, the end date will be automatically adjusted, including corrections for leap year. The clock operates in either the 24 hours or band / AM / PM indication of the 12-hour format. Provides two configurable alarm clock and a calendar can be set to a square wave output. Address and data are transferred serially through an I2C bidirectional bus.

About: Maker 101; Beginner and intermediate level Maker projects! You can find projects such as "How to" and "DIY" on programmable boards such as Arduino, ESP8266, ESP32 and Raspberry Pi on this channel. The projects…

For Raspberry Pi DS3231 is high precision clock module. It can also be used on Arduino motherboard. The module itself can be adapted to 3.3 V and 5 V system and no level conversion needed, which is super convenient.

2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.

This is a tutorial of an open source Arduino library, which lets you turn your Arduino to a “Clock”, with a Maxim Integrated DS3232 Real Time Clock module. I will show you how to install the library to Arduino IDE and make an example project with the library, throughout this tutorial while giving information digital clocks and their working principle.

A digital clock is a clock consisting of a power supply, a circuit consisting of an crystal oscillator and a display to show the time, which shows the time digitally unlike traditional analog clocks. First digital clock is made by an Austrian engineer named Josef Pallweber using a jump hour mechanism. Digital clocks have the same fundamental working principle as the analog clocks. They need a source of power to run the clock, which is the power supply, a battery or AC power, a display which can be a LED, LCD display or a seven segment display, and a time base that keeps track of the time which is the time circuit consisting of an crystal oscillator and a counter. The crystal oscillator creates a steady 60 or 50 Hertz signal. Then created signal is divided down using a counter circuit in order to create a binary number. Then this number is converted to the time format desired (12 hour or 24 hour format) and sent to the display. Digital clocks are used in nearly everywhere in our lives, such as ovens, cars, phones, televisions, computers, radios, industrial timers.

I"ll show you step by step how to use the DS3232RTC Arduino library with a simple example. In this example project, we will make a real time digital clock with an Arduino microcontroller, and a Maxim Integrated DS3232 or DS3231 Real-Time Clock module. In order to make a real time digital clock with an Arduino, first we’ll have to get the time from the real time clock module. Then we need to print the time in certain intervals to the serial monitor screen. Connections for DS3232 real time clock module to Arduino is shown below.

3. First we need to add the setup commands. In the void setup() function, add the code that starts serial communication in 9600 baud rate. Then type the library function to get the time from the RTC module. Add an if statement afterwards, which will trigger if the Arduino cannot sync up with the real time clock module and prints the situation to serial monitor. Add an else statement and make it print that the system time is set.

4. After setup is done, we need to create a function that returns the time and prints the time to serial monitor. Name the void returning function “displayTime”. Add the codes below which prints the time to serial monitor.

6. In the void loop() function, add the function that we created in order to print the real world time to serial monitor. Then add an 1 second interval between the time printings using delay command. You can change the interval as desired.

In this tutorial I’ve shown how to install “DS3232RTC” Arduino library, written by GitHub user “JChristensen” to Arduino IDE, showing how to use the library functions with an example, while giving information about what digital clocks are and their working principle.

We were already playing around with LED MATRIX for time and temperature display with a Wi-Fi connection on an ESP8266, but we didn’t create yet a project with an RTC (Real Time Clock) module and an 1.8 inch TFT display; here we go. We will use again a ready to go code, but we will change it a bit for better looking. SO, we will learn How-To code rectangles and lines for a TFT screen, very easy… It is GOOD to try out different components to get used with coding, Maker, MakerED… Especially when we use displays, which ever ones, as one sees directly the results; sensation of direct success!!

The tutorial in the video shows an Arduino UNO, but we will use in this tutorial an Arduino NANO as it is less expensive (+/- 1/3 of the price of an Arduino UNO) and also it takes less place when integrating the components into a box.

As you can see it is a very cheap project, ONLY 22,98€and easy to realize! ALL what YOU need is a bit time, passion and here we GO!