#real-time clock (rtc)

[speculatrix]

Zolatron: RTC, SRAM and SD board

After my fun with real-time clock chips (here and here) I figured it was time to add one to the Zolatron 64. But there was a catch. The previous experiments had involved microcontrollers with built-in SPI capabilities. That was something the Zolatron sadly lacked. Luckily, someone else has already come up with a solution. The 65SPI project by Daryl Rictor is a very easy way to add an SPI…

[tomsonelectronics-blog]

Buy RTC Module DS1302 Online

Get the RTC Module DS1302 online for precise timekeeping in projects. Easy to integrate, low power consumption, and ideal for microcontroller applications.

[dvvdi2err]

https://www.futureelectronics.com/p/semiconductors--real-time-clocks/pca21125t-q900-1-1-nxp-2050256

Real time clock applications, real time clock sensor, world clock converter

PCA21125 Series 5.5 V SPI-bus Real-Time Clock and calendar - TSSOP-14

[uvaldecomputerrepairsstuff]

Unlocking the Power of RTC Batteries: Timekeeping and Beyond

In the vast landscape of electronic devices, there exists a diminutive yet essential component that quietly upholds synchronization and stability – the RTC (Real-Time Clock) battery. While its primary purpose revolves around timekeeping, these unassuming power sources play a more profound role in maintaining vital settings, preserving data integrity, and enhancing device functionality. Let’s…

[christanworkshop]

DIY: Making A Pwnagotchi

Yes, I know I am very late to the game ... LOL I was meddling with Flipper Zero and war driving, then I came across the Pwnagotchi project. Since I already had the parts to do this lying around in my workshop, I decided to put together my own Pwnagotchi just for fun. Started by hooking up the Waveshare 2.13" Black and White E-Ink Display to a Raspberry Pi running a fresh Raspbian image and downloaded the Waveshare demo code to test the display to make sure it's working properly, since I have not actually used it before. This is a v4 display.

After that, I just followed all the instructions over here to put it all together, including adding a real time clock. I used the DS3231 RTC module designed for Pi, but in order to make it fit into the space between the display and the Pi board, I had to make some modifications. The female header pins on the RTC module was desoldered and short wires were soldered on. The battery also had to be desoldered and resoldered on in a new positionlike below to make the module thin enough. The module was then wrapped in wire tape for insulation. Now, we can just slot the wires into the female header pin holes of the display before we snap it onto the Pi board.

Below, you can see the RTC fits comfortably between the boards. I also attached a UPS Lite v1.2 board. Apparently, the UPS Lite board I had was a clone/knock off. It uses I2C address of 0x32 instead of 0x36 that was used in the original product, so the UPS Lite plugin in Pwnagotchi won't work. Oh well, I will just use it like a normal battery pack.

Now, for the software. The original Pwnagotchi project has not had any new updates for over 2 years, so it's kinda out of date and it doesn't support the newer Waveshare displays. Luckily for us, someone had taken the effort to fork the project and released new versions of Pwnagotchi over here. Note that this requires Raspberry Pi Zero 2 W.

The Waveshare 2.13" E-Ink display that I had was v4, but I found that I had to set the display type to "waveshare_3" in Pwnagotchi settings for it to work properly. Next is to 3D print a case for this, but in the mean time, I used some nano bricks to build a temporary case for it.

That's it for now. Happy hacking!

[theangelcatalogue]

If you guys haven't seen my RTC Wonderland production idea, it is NOT a real production, just something I brainstormed in the middle of the night.

First Part

Second Part

(Under the cut for the people who can't access the link or just want to read about it in this post)

(Also there is a Gif of Anne Hathaway as White Queen, just warning cause why not)

FIRST PART

I already talked about this with a friend by I modified some things:

Jane with the Queen of hearts design, and her performance would be like:

When she says " Or it is lost somewhere with my head? " the choir does the ' off with your head ' sign in the background, and she touches her neck, like if they said she would lose her head.

And the flight part where she would like fall trying to search for something to grab and stop herself of falling, like Alice falls from the rabbit role, also the choir members holding white roses but dirty with red, since I read somewhere that the Queen of hearts uses the blood of the people she decapitated to paint the roses, so they used Jane's blood to pain the Roses or something like that.

But her performance wouldn't be Queen of hearts related, more like she was a card that was decapitated by the Queen, but who would have a queen related performance? Ocean cause why not, Ocean would even use a little crown during What the world needs, and everyone has a card, but Jane's card is different because Ocean doesn't see and admit Jane as a member of their choir they forgot about (a personal hc of mine)

Then Noel represents the caterpillar, the Monique outfit having some blue details, and she would be smoking whatever that caterpillar smokes

Misha represents the mad hatter, the This song is awesome performance would be like a crazy tea party, and in Talia things get calmer, and it has some flowers, representing the Wonderland's flowers but also Mad Hatter's more gentleman side, since he is not that crazy.

Ricky is the Cheshire cat, he's performance is a bit more mysterious, mixing space and purple tones, and maybe some special effects smoke when he appears in the Space Age Bachelor man suit

The birthday song is like a mini tea party for Jane

Constance is the white rabbit, and it has some broken clocks, like if the Rabbit had missed the time but doesn't give a damn about it

The portal to go back to life is a rabbit hole, in the end of It's not a game/It's just a ride they all go in, 2016 off-Broadway vibes, and when they go in Penny's shadow appears, dressed as Alice, reveling she wasn't just a card but yet an important part, she was the Alice of their Wonderland.

-

So… I'm back but this time I want to talk about Karnak and the opening of the musical, and other extra details that I don't know if i include or not:

Karnak is the march here, that is the craziest in the Wonderland if you think well, Mad Hatter is crazy, but he has a gentle side, the march hare is crazy and messy, which would be ironic for Karnak, his name could be " Karnak, the amazing hare . ", but he prefers " the amazing Karnak. " Karnak could also be interactive and change a bit on the songs, he could close his curtains while telling the choir's stories and when he opens up again. My idea is:

He uses a " Vote for Ocean " pin that Ocean herself made the choir members use in What the world needs

a beret during Noel's Lament

sunglasses during TSIA and a flower crown during Talia

A little cat ear during SABM, not the mask, just the ears

His curtain would be closed during TBOJD, since he says he never read her fortune

Some confetti during Sugar Cloud

Virgil could be dressed like mad hatter and the hare, or maybe he could be a rat with another details inspired by the jabberwocky

The opening would depend on which song to use, but i like to think of the use of simple effects that could represent the choir died and now are in the limbo, a little changing of lighting and props maybe? My idea is that the choir falls in the floor when they finish singing the opening, like they just fell from the surface and ended up in wonderland

Jane's design, I imagine her makeup being like Lizzie's heart from Ever After high, her hair could be totally black, and her doll would be dressed like a queen, my idea is that she also has a little crown in her hair, that Ocean takes it off during WTWN, Jane would try to search for it, but Ricky stops her, but after Ocean finishes her song, he takes the crown off and gives it to Jane (idk if i include this or no)

Some background bonding scenes with Misha and Jane, since the Mad Hatter is found of Alice in the movies (I'm mixing the book and the movies a bit) and really implied Spacedolls

Thanks for hearing and sorry if i'm bothering, i'm thinking of writing a script for this specific production because why not?

-

YES I COPYPASTED IT DON'T JUDGE ME

[psi-hate]

i was recommended a really cool pokemon emerald romhack called "pokemon heliodor" and was really excited to flash it on my shitty repro cart i use for testing. unfortunately, the cart lacks a battery or a flashRAM chip, meaning the game injected into it needs to be patched with a couple assembly payloads to rework some of the functionality to get these games working on them. examples include having the game load and flush it's save data from or into the ROM itself (self modifying code?? wild), or having any real-time clock stuff be relative to the game-time rather than 24/7 like a real rtc.

now, this presents an issue if you want to apply such patches to a romhack, especially a romhack based on a decomp that has shifted data. A patch made for a regular rom and patched to a romhack will either fail to patch or corrupt it. The patch I was concerned about was the battery-less rtc, as the Romhack would fail to patch onto a rom already rtc-fixed. As this rtc fix exists online only as a random assembly payload I'd have to receive from the ROM itself and reverse engineer, and any searching for a similar project in mind came up short, I decided if I wanted to play this romhack on my shitty repro, I'd have to learn how to fix the rtc myself and then apply it to the romhack's source and pray that the rest of the process works.

.

.

.

it works! it took a bit of trial and error snubbing out the battery communications and adjusting how the data was interpreted, especially in a codebase I had 0 prior knowledge of. thankfully the flashRAM payload works fine as that's not really a patch and more of an automated function hook replacement.

the whole reason I wanted to do this was because this romhack has a functional day/night cycle based on the rtc and i didn't want it to be constantly day or night forever I'd just play vanilla pokemon emerald in that case lmao

anyway the final result is that I can play this romhack on my actual GBA with a repro cart that costs like $2 with most the features you'd expect from a proper flashcart or authentic copy, or at least as close as you can get. I want to figure out soft-reset RNG seeding as the lack of a 24/7 battery results in deterministic RNG which sucks for soft reset shiny hunting, but I'm sleepy. goodnight !

[quartz-components]

Features

SD Card Slot: Supports standard SD and microSD cards (with adapter) for data storage.

Real-Time Clock (RTC): Includes an integrated DS1307 RTC to timestamp data accurately.

Dedicated Headers: Pin headers for easy connection to Arduino and external modules.

Reset Button: Convenient reset function for debugging and testing.

Prototyping Area: Extra space for adding custom circuits or components.

Battery Backup: Keeps the RTC running during power loss (requires CR1220 battery, not included).

[speculatrix]

Adventures with real-time clocks - part 1

Adventures with real-time clocks - part 1 - adding an RTC to my homebrew computer.

So I decided that I’d like to add a real-time clock (RTC) to the Zolatron project because … why not? Should be easy, I thought. Lots of people have done it. All I need is the right chip. Maybe that’s where I made my mistake. MCP795W20 RTC pinout As it turned out, for some reason, I already own three copies of the Micrcship MCP795W20. Why I have these and how long I’ve had them are mysteries to…

[adafruit]

The MAX31328 is a modernized DS3231 🔬🕰️🔋

The ADI DS3231 - previously known as Maxim, previously previously known as Dallas Semi - is a high precision Real Time Clock - its one of the best out there thanks to it's internal temperature compensated crystal. but its kinda old, and ADI has done a refresh on the chip while keeping it software/firmware compatible. The MAX31328 https://www.digikey.com/short/5jff8p90 is a different, smaller package, probably uses a modern-er process too. We covered this family on EYE ON NPI about a year ago https://blog.adafruit.com/2022/05/26/eye-on-npi-analog-devices-maxim-max31329-real-time-clock-rtc-eyeonnpi-adi_news-digikey-adafruit/ and parts we booked back then finally appeared so we can design a prototype board! here it is in our STEMMA QT format - on the back is a coin cell holder to keep time for up to 7 years.

[szonikuscsavarhuzo]

Megjelent az új Raspberry

Broadcom BCM2712 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU, with cryptography extensions, 512KB per-core L2 caches and a 2MB shared L3 cache

VideoCore VII GPU, supporting OpenGL ES 3.1, Vulkan 1.2

Dual 4Kp60 HDMI® display output with HDR support

4Kp60 HEVC decoder

LPDDR4X-4267 SDRAM (4GB and 8GB SKUs available at launch)

Dual-band 802.11ac Wi-Fi®

Bluetooth 5.0 / Bluetooth Low Energy (BLE)

microSD card slot, with support for high-speed SDR104 mode

2 × USB 3.0 ports, supporting simultaneous 5Gbps operation

2 × USB 2.0 ports

Gigabit Ethernet, with PoE+ support (requires separate PoE+ HAT)

2 × 4-lane MIPI camera/display transceivers

PCIe 2.0 x1 interface for fast peripherals (requires separate M.2 HAT or other adapter)

5V/5A DC power via USB-C, with Power Delivery support

Raspberry Pi standard 40-pin header

Real-time clock (RTC), powered from external battery

Power button

[seo678]

what are cr1220 batteries used for

The CR1220 battery, a compact lithium manganese dioxide coin cell, has emerged as a critical power source for numerous electronic devices. With its standardized dimensions of 12.5mm in diameter and 2.0mm in height, this 3-volt battery combines high energy density, stable voltage output, and long shelf life, making it indispensable across industries. This article explores the diverse applications of CR1220 batteries, highlighting their role in modern technology.

Consumer Electronics: The Backbone of Portable Devices CR1220 batteries are ubiquitous in consumer electronics, particularly in devices requiring minimal power but long-term reliability. Electronic watches, calculators, and digital thermometers rely on these batteries due to their compact size and 3-volt output, which is nearly double that of conventional alkaline cells. For instance, Panasonic’s CR1220 models, manufactured in Indonesia, are engineered to maintain voltage stability even under low-load conditions, ensuring accurate timekeeping or sensor readings for up to three years in ideal storage environments.

In wearable technology, CR1220 batteries power fitness trackers and smart key fobs. Their lightweight design—typically weighing around 0.8 grams—and low self-discharge rate (less than 1% per year) make them ideal for devices that demand minimal maintenance. Domestic brands like Desay have optimized their CR1220 variants for automotive applications, such as keyless entry systems and tire pressure monitors, where durability and temperature resistance (operating range: -30°C to 70°C) are critical.

Industrial and IoT Applications: Enabling Smart Infrastructure The industrial sector leverages CR1220 batteries for real-time clock (RTC) modules in embedded systems. These batteries ensure data integrity during power outages, preserving critical timestamps in equipment like programmable logic controllers (PLCs) and industrial sensors. Murata’s CR1220 models, certified under UL1642 standards, are deployed in IoT devices such as asset tracking tags and environmental monitors, where their leak-resistant design and 38mAh capacity support multi-year deployments without replacement.

In robotics, CR1220 batteries serve as backup power for RTC circuits, preventing data loss in autonomous machines. Their ability to withstand extreme temperatures makes them suitable for outdoor applications, including smart meters and agricultural sensors. For example, a commercial robotics manufacturer in Shenzhen adopted Panasonic’s CR1220 batteries for its RTC modules, citing their 0.1mA standard discharge current and 830-hour lifespan under continuous load as key advantages.

Medical and Specialized Equipment: Precision in Critical Systems Medical devices rely on CR1220 batteries for their reliability and safety. Digital thermometers, hearing aids, and glucose meters benefit from the batteries’ stable voltage output, which ensures accurate readings. The batteries’ RoHS compliance and lead-free construction align with medical industry regulations, while their 5-year shelf life (when stored at 20°C) reduces inventory management challenges for healthcare providers.

In specialized applications, CR1220 batteries power RFID tags, electronic shelf labels, and emergency beacons. Their high pulse discharge capability supports intermittent high-current demands, such as activating LED indicators or transmitting distress signals. A study by a leading electronics distributor found that CR1220 batteries accounted for 65% of coin cell sales in the medical and security sectors due to their performance consistency.

Conclusion The CR1220 battery’s versatility stems from its blend of size, voltage, and longevity. From consumer gadgets to industrial IoT systems and medical devices, its ability to deliver stable power in compact form factors has cemented its role as a cornerstone of modern electronics. As technology evolves, the demand for reliable, low-maintenance power sources will continue to grow, ensuring the CR1220 battery remains a vital component in the global electronics ecosystem. Its widespread adoption across industries underscores its unmatched balance of performance and practicality, making it an enduring choice for designers and manufacturers worldwide.

[semiconductorlogs]

Global Real-Time Clock ICs Market to Reach US$ 5.28 Billion by 2032

Real-Time Clock (RTC) ICs Market Analysis:

The global Real-Time Clock (RTC) ICs Market size was valued at US$ 3.41 billion in 2024 and is projected to reach US$ 5.28 billion by 2032, at a CAGR of 6.5% during the forecast period 2025-2032

Real-Time Clock (RTC) ICs Market Overview

This report provides a deep insight into the global Real-Time Clock (RTC) ICs market covering all its essential aspects. This ranges from a macro overview of the market to micro details of the market size, competitive landscape, development trend, niche market, key market drivers and challenges, SWOT analysis, value chain analysis, etc. The analysis helps the reader to shape the competition within the industries and strategies for the competitive environment to enhance the potential profit. Furthermore, it provides a simple framework for evaluating and accessing the position of the business organization. The report structure also focuses on the competitive landscape of the Global Real-Time Clock (RTC) ICs Market, this report introduces in detail the market share, market performance, product situation, operation situation, etc. of the main players, which helps the readers in the industry to identify the main competitors and deeply understand the competition pattern of the market. In a word, this report is a must-read for industry players, investors, researchers, consultants, business strategists, and all those who have any kind of stake or are planning to foray into the Real-Time Clock (RTC) ICs market in any manner.

Real-Time Clock (RTC) ICs Key Market Trends  :

Integration with IoT Devices RTC ICs are increasingly being integrated into IoT devices for precise time tracking, enabling power-efficient operations and data synchronization.

Rise in Wearable and Portable Devices The growing popularity of wearables and portable electronics is boosting demand for compact and low-power RTC ICs.

Miniaturization and Power Efficiency Technological advancements are leading to the development of ultra-small RTC ICs with minimal power consumption, ideal for battery-operated devices.

Adoption in Industrial Automation RTC ICs are gaining traction in industrial applications for real-time event logging and process control systems.

Emergence of RTCs with Integrated Memory New RTC ICs come with integrated memory modules for enhanced data storage and backup, especially during power failures.

Real-Time Clock (RTC) ICs Market Regional Analysis :

https://semiconductorinsight.com/wp-content/uploads/2025/01/download-34_11zon-1.png

North America:Strong demand driven by EVs, 5G infrastructure, and renewable energy, with the U.S. leading the market.

Europe:Growth fueled by automotive electrification, renewable energy, and strong regulatory support, with Germany as a key player.

Asia-Pacific:Dominates the market due to large-scale manufacturing in China and Japan, with growing demand from EVs, 5G, and semiconductors.

South America:Emerging market, driven by renewable energy and EV adoption, with Brazil leading growth.

Middle East & Africa:Gradual growth, mainly due to investments in renewable energy and EV infrastructure, with Saudi Arabia and UAE as key contributors.

Real-Time Clock (RTC) ICs Market Segmentation :

The research report includes specific segments by region (country), manufacturers, Type, and Application. Market segmentation creates subsets of a market based on product type, end-user or application, Geographic, and other factors. By understanding the market segments, the decision-maker can leverage this targeting in the product, sales, and marketing strategies. Market segments can power your product development cycles by informing how you create product offerings for different segments. Key Company

Maxim Integrated

Theorycircuit

Renesas Electronics Corporation

ABLIC

Market Segmentation (by Type)

I2C

SPI

Others

Market Segmentation (by Application)

Consumer Electronics

Industrial Applications

Others

Market Drivers

Growing Demand for Consumer Electronics The increasing usage of smartphones, tablets, and smart wearables is a major factor driving the need for reliable real-time tracking components like RTC ICs.

Expansion of Industrial Automation RTC ICs are essential in factory automation systems for scheduling and time stamping, which supports the growth of smart manufacturing processes.

Advancements in Semiconductor Technology Ongoing improvements in IC design and manufacturing are enabling more power-efficient and compact RTC solutions.

Market Restraints

High Cost of Advanced RTC ICs Sophisticated RTCs with extended features and ultra-low power consumption come at a higher cost, limiting adoption among price-sensitive users.

Limited Awareness in Emerging Economies The lack of knowledge and availability in some developing regions can restrict market growth and innovation diffusion.

Complex Design Integration Incorporating RTC ICs into complex electronic systems can be challenging and may require additional design and validation efforts.

Market Opportunities

Growing Adoption in Automotive Electronics RTC ICs are being widely adopted in automotive systems for event logging, GPS timestamping, and dashboard timing applications.

Booming IoT Market As IoT applications grow, the demand for efficient, real-time tracking solutions like RTC ICs increases significantly across sectors.

Rise in Edge Computing and Smart Devices The expansion of edge computing and smart devices presents new opportunities for RTC ICs in ensuring accurate timekeeping in decentralized networks.

Market Challenges

Ensuring Long Battery Life Designing RTC ICs that deliver ultra-low power consumption while maintaining accuracy is a technical challenge for manufacturers.

Supply Chain Disruptions Global semiconductor supply chain issues can impact the availability and lead times of RTC ICs, affecting production and delivery schedules.

Maintaining Accuracy Across Environments RTC ICs must maintain timekeeping accuracy under varying environmental conditions, which can be difficult without adding cost.

Key Benefits of This Market Research:

Industry drivers, restraints, and opportunities covered in the study

Neutral perspective on the market performance

Recent industry trends and developments

Competitive landscape & strategies of key players

Potential & niche segments and regions exhibiting promising growth covered

Historical, current, and projected market size, in terms of value

In-depth analysis of the Real-Time Clock (RTC) ICs Market

Overview of the regional outlook of the Real-Time Clock (RTC) ICs Market:

Key Reasons to Buy this Report:

Access to date statistics compiled by our researchers. These provide you with historical and forecast data, which is analyzed to tell you why your market is set to change

This enables you to anticipate market changes to remain ahead of your competitors

You will be able to copy data from the Excel spreadsheet straight into your marketing plans, business presentations, or other strategic documents

The concise analysis, clear graph, and table format will enable you to pinpoint the information you require quickly

Provision of market value (USD Billion) data for each segment and sub-segment

Indicates the region and segment that is expected to witness the fastest growth as well as to dominate the market

Provides insight into the market through Value Chain

Market dynamics scenario, along with growth opportunities of the market in the years to come

6-month post-sales analyst support

Customization of the Report In case of any queries or customization requirements, please connect with our sales team, who will ensure that your requirements are met.

[starlinkcommunication]

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Star Link’s Time Office Software is your ultimate partner for biometric attendance. Whether it’s managing night shift employees or importing data effortlessly through Excel — we’ve got it covered.

✔️ Real-Time Clock (RTC) for night shift support ✔️ Direct integration with biometric attendance systems ✔️ Easy master data import via Excel

📌 Boost your HR efficiency and automate daily attendance tracking with ease. 📲 Book your demo today!

#StarLink #TimeOfficeSoftware #BiometricAttendance #SmartHR #WorkplaceAutomation #TechForBusiness #AttendanceSolutions #BusinessSoftware

[codingprolab]

ECE391: Computer Systems Engineering Machine Problem 1

Text-Mode Missile Command In this machine problem, you will implement a text-mode version of Missile Command, the classic arcade video game, in x86 assembly as an extension to the Linux real-time clock (RTC) driver. This assignment should provide substantial experience with the x86 ISA and provide an introduction to how drivers accomplish tasks inside the Linux kernel. This handout first explains…