Microcontrollers

Let’s reboot the DC Postgres Meetup series! This inaugural meeting will be hosted by John Porvaznik and Eddie Pickle and all are welcome. We’re actively looking for speakers, co-hosts, event spaces and other folks that want to help bring this group back to life. If you can’t make it but want to be involved in the future, please let us know. John Porvaznik will present a talk on Postgres fundamentals including shared buffers, memory usage, pages, and more. John is a long time PostgreSQL Engineer and DBA in the government space with focus on ETL / Data Ingestion, PostGIS and spatial data sets, query optimizations, Database Design // DDL, benchmarking and specifications, data health, and system healths and monitoring. This meetup will be hosted near the Snowflake office in Tysons (event space sponsored by Snowflake). We’ll have pizza and drinks for folks. 6:00 arrival and networking, 6:30 talk followed by discussion, 7:45 close. The event is at 1750 Tysons Boulevard, McClean, VA, 22102, in the 1750 Tysons Conference Center. This is Metro Accessible from the Silver Line to Tyson's Corner station. Parking at the mall next door is free or the event building has paid parking.

**This talk has completely sold out in advance and no door tickets will be available. You must have purchased a ticket to attend.** [Profs and Pints DC](https://www.profsandpints.com/washingtondc) presents: **“Cuba, Our Closest Enemy,”** on our country’s volatile relationship with an island nation off Florida’s coast, with William M. LeoGrande, professor of government at American University and leading expert on U.S.-Cuban relations. [Advance tickets: $13.50 plus sales tax and processing fees. Available at [https://events.ticketleap.com/tickets/profsandpints/dc-cuba](https://events.ticketleap.com/tickets/profsandpints/dc-cuba) .] The United States and Cuba are fractious neighbors who can’t get along but can’t move away from one another. From Fidel Castro’s defiant revolution to Donald Trump’s “Donroe Doctrine” asserting U.S. dominance in the Western Hemisphere, U.S. relations with Cuba have been acrimonious, tumultuous, and often dangerous—marked by invasion, attempted assassinations, nuclear confrontation, and half a century of economic warfare. Gain a deeper understanding of relationships between the two countries with Dr. William LeoGrande, widely recognized as one of the nation’s foremost experts on Cuban politics and U.S. policy toward the island, having authored or edited seven books on the subject, including *Back Channel to Cuba: The Hidden History of Negotiations between Washington and Havana.* Professor LeoGrande’s talk will chronicle the trajectory of this unique relationship of “perpetual hostility,” as Henry Kissinger called it, from confrontations to secret talks aimed at reconciliation. We’ll see how America’s playground of the 1950s became a cold war ally of the Soviet Union and how Cuban refugees became a powerful force in American politics. We’ll look at how the end of the cold war changed U.S.-Cuban relations—or didn’t—and how repeated attempts at rapprochement failed to rebuild the bridges that had burned in the early days of Cuba’s revolution. Since Fidel Castro left center stage in 2006, U.S.-Cuban relations have lurched back and forth at stomach-churning velocity. Professor LeoGrande, who has advised Congress on Cuba as a member of its foreign policy staff, will explore the stories behind the headlines. You’ll learn how changes from Republican to Democratic presidents produced radical swings in relations between Washington and Havana, most dramatically between President Barack Obama’s attempt to normalize relations and Donald Trump’s threats to bankrupt or invade the island. ( Doors: $17, or $15 with a student ID. Listed time is for doors. Talk starts 30 minutes later.) Image: A Cuban military truck in Havanna in 2006 (Photo by Thomassin Mickaël / Creative Commons).

Everyone is welcome to attend our weekly happy hour, at Tony & Joe's Waterfront Bar in Georgetown (3000 K. St, NW). The event goes from 7:15 to around 10:00 PM. Feel free to show up at any time. French speakers of all levels- from beginners to expats- are invited. We hope to see you there!

**​​​​​​​​A free, public workshop—no technical background needed** ​​​​​​​​ In just the past 8 months, AI has advanced at a pace that stunned even leading experts. These systems aren’t science fiction anymore—they’re reshaping work, relationships, and even crime in real time. ​​​​​​​​This workshop explores where AI may be in the next 1–5 years and what that means for your daily life. Together, we’ll tackle urgent questions like: * ​​​​​​​​**Jobs**: Could AI lead to mass unemployment—or entirely new kinds of work? * ​​​​​​​​**Crime**: How might AI supercharge scams, hacking, and even physical crime? * ​​​​​​​​**Companions**: Will people form deep emotional bonds—or even romantic relationships—with AI assistants? * ​​​​​​​​**Society**: How do top researchers think these trends will shape our future? **​​​​​​​​What you’ll get:** * ​​​​​​​​A fast-paced, beginner-friendly overview of today’s most powerful AI systems * ​​​​​​​​Live demos that reveal both the breakthroughs and the risks * ​​​​​​​​An interactive forecasting exercise where you’ll test your own predictions about AI’s impact ​​​​​​​​Come ready to explore a future arriving faster than most people realize—one that could transform not just how we work, but how we trust, connect, and even love.

Please join us every week for power networking! Our Chapter Passed $1,666,736 USD in the past 12 months! BNI members, on average, increase their business 20% the first year. Our chapter is a dynamic, committed group of business people who know how to refer business to each other. Come for our meeting -- stay for the referrals!!! We have open categories for individuals who will bring enthusiasm and integrity to our meeting. Just one person per professional specialty is allowed in each chapter. Visit a meeting to find out more and lock out your competition! Register Here: https://bninovanorth.com/va-nova-north-bni-mclean-business-connection--n136/en-US/visitorregistration?chapterId=16988

**💃 Ready to Try Something New? Join AM Salsa Dance This October!** **AM Salsa Dance is excited to launch a 4-week Beginner Salsa Dance Series starting Tuesday April 7th! Whether you're completely new to salsa or looking to refresh your basics, this series is perfect for adults ready to step onto the dance floor with confidence.** **🕺 What to Expect** **✔️ Fundamental Cuban salsa footwork to get you moving** **✔️ Step-by-step partner dancing techniques** **✔️ Learn timing, rhythm, and styling tips** **✔️ Supportive, welcoming environment — no partner needed!** **📌 Class Details** **📍 Location: Maryland Youth Ballet, 926 Ellsworth Dr, Silver Spring, MD 20910** **🗓 Dates: Tuesday — April 7, 14, 21, & 28 **⏰ Time: 7:30 PM – 9:00 PM** **💰 Cost:** * **$60 for the full 4-week series (1.5 hours of instruction)** * **$18 per drop-in class (if space is available)** **🔐 No Walk-Ins — Registration is required!** **Each class builds on the previous one, ensuring you progress with structure and support.** **💳 Payment Options:** * **Cash at the venue** * **PayPal / Cash App / Zelle / Venmo: 301-675-4565** * **💻 [Pay for All 4 Classes – $60] https://square.link/u/yqQ4LTDo** * **💻 [Pay for One Class – $18](https://checkout.square.site/merchant/KD199AS6SCJ1E/checkout/GCZWPFOWDAOSNUYMCHZBDWLM)** **🙋 Have Questions?** **📧 Email:** amsalsadance@gmail.com **📞 Phone: 301-675-4565** **🌐 Website: [www.amsalsa.com](http://www.amsalsa.com)** **🎉 Don’t miss this opportunity to kickstart your salsa journey!** **In just one month, you’ll gain the foundation to dance with confidence, meet new people, and have fun doing it. Let’s dance, Silver Spring! 💃🕺** **💃

Want to mess with some electronics? Or perhaps contribute to HacDC's main group project? HacDC's latest event brings hardware projects to the community. We will focus primarily on the main project (Space Blimp!) but please feel free to bring some of your own projects to show off and work on!

Join us for an evening of deep product insights and conversation with Steve Johnson, CEO of Product Growth Leaders. Most product managers aren’t struggling because they lack frameworks, data, or AI tools. They’re struggling because they’re talking to the wrong people. Instead of learning directly from customers, they rely on second-hand input—sales requests, executive opinions, support tickets, dashboards, and now AI-generated summaries of all of it. The result? Noise. Misalignment. And products that look good on paper but miss the market. AI can process more data than you ever will—but it can’t replace direct human understanding. It can’t see hesitation. It can’t hear what’s not being said. And it certainly can’t build trust with a customer who doesn’t believe you yet. That’s where product managers have an advantage—if they choose to use it. In this session, you’ll learn how Customer Conversations cut through the noise and become your most powerful differentiator. Not as a research technique, but as a leadership behavior that builds market insight, credibility, and better decisions. Through real stories and practical methods, you’ll learn how to: • Talk to the right people at the right time in the product lifecycle • Ask questions that uncover real problems • Validate ideas before you build them Because in a world where AI can generate answers at scale, the product manager who understands customers firsthand becomes the one who asks better questions—and makes better decisions. AGENDA 6:00 - 6:30 pm: Welcome and Registration. Refreshments provided. 6:30 - 7:00 pm: Talk by Steve Johnson (CEO at Product Growth Leaders) 7:00 - 7:15 pm: Q&A 7:15 - 8:00 pm: Networking ABOUT THE SPEAKER Steve Johnson is a product success coach focused on removing the chaos from product planning. He uses modern methods to guide product teams from idea to market in only a few weeks. Steve has trained tens of thousands of product professionals in his career. He is a former instructor and vice president at Pragmatic Institute and the chief architect of the popular Quartz Open Framework.

Climbers of all skill levels are welcome to Join "Sends with Friends" rock climbing community for an indoor rock climbing (top rope or lead) event at [Movement Rockville gym](https://maps.app.goo.gl/ZZD5jntgU4Y6fY9A9)! **$15 Day-Pass for non-movement climbers!** Here's what you need: 1. Signed [waiver](https://movementgyms.com/waiver/): https://movementgyms.com/waiver/ 2. Belay check, which can be done the same day. See [Your First Visit](https://movementgyms.com/first-visit/) page for more info: https://movementgyms.com/first-visit/ If this is your first time signing the waiver with Movement gyms, **your first visit will be free of charge**, all climbing gears included. To find us, go past the front desk and turn left. We'll gather by the benches next to the fitness room entrance. If you are completely new to climbing, you are welcome to come and try it with us after you take the Introduction to Rope Climbing Course which will be free of charge for you if you let me know. This meetup is free and run by volunteer organizers, however, access to Movement gyms requires a membership or purchase of a day pass. This meetup is for belaytionship only, unwanted advances will not be tolerated. **Sends with Friends Rock Climbing Meetup Waiver and Release of Liability** **NOTICE:** By signing up for this event, you agree to the terms outlined below and acknowledge the inherent risks associated with rock climbing activities. Participation in any event organized by this Meetup group is contingent upon your agreement to this release form. **1\. Assumption of Risk:** I, the undersigned participant, acknowledge and fully understand that rock climbing is a high-risk activity. I am aware that participation involves risks including, but not limited to, physical injury, permanent disability, or death. These risks may arise from, but are not limited to, natural hazards, equipment failure, human error, and the actions or negligence of others. **2\. Release of Liability:** In consideration of being allowed to participate in any activity organized by this Meetup group, I hereby release and discharge the organizer(s), co-organizer(s), event leaders, and all other participants from any and all claims, demands, actions, or causes of action arising out of or connected to my participation, including claims arising from negligence or gross negligence. **3\. Personal Responsibility:** I acknowledge that I am solely responsible for my own safety during these events. I will use my own judgment in evaluating the risks involved and will take appropriate precautions, including but not limited to: * Wearing appropriate safety gear. * Using reliable climbing equipment. * Following established safety protocols. * Refraining from participating in activities beyond my skill level. **4\. Medical Fitness:** I affirm that I am in good health and physically capable of participating in rock climbing activities. I assume full responsibility for any medical conditions that may affect my ability to participate safely. **5\. Indemnity Agreement:** I agree to indemnify and hold harmless the organizer(s), co-organizer(s), event leaders, and other participants from any claims, damages, or expenses (including legal fees) arising out of or related to my actions or participation in these activities. **6\. Photo/Video Release \(Optional\):** By signing this waiver, I grant permission for any photographs or videos taken during the events to be used for promotional or group-related purposes. (Participants may opt out by notifying the organizer.) **7\. Agreement to Follow Rules:** I agree to abide by all rules, instructions, and guidance provided by the event organizers and leaders. Failure to comply may result in my removal from the group. **8\. Acknowledgment of Agreement:** By joining any event organized by this Meetup group, I acknowledge that I have read and understood this waiver and release form. I agree that my participation in any event constitutes my electronic or physical signature to this agreement.

DC Code and Coffee is an inclusive, informal co-working session. It's community-led and community-run by devs, for devs. People of all skill levels attend. Whether you’re dev-curious, aspiring, or a professional developer, we’d love to have you! Come chat or learn to code on a Sunday afternoon with coffee and cool-inclusive people. Bring your laptop! We typically meet every month on the weekend. **Join our online community!** For all things Tech in DC and to get latest updates and tech events from the DMV area, join the [DCTech Slack](https://dctech.chat/). All DC Code & Coffee announcements are in the #dccodecoffee channel **How it works** Near the beginning of the event, we do an introduction circle. You say your name, what you can help others with, and what you would like help with. You can also share job opportunities. After the introduction circle, everything is self-organized.

• What we'll do Economist William Michael Cunningham on Podbeam Thursdays at 6 pm. https://www.podbean.com/

We're back! The Cover6 Community's in-person meetup returns for round two — and if you missed the first one, this is your shot. We're keeping it intimate this time — we've got space reserved right by the bar. Perfect size for real conversations. **What to expect:** * Pure open networking — no agenda, no presentations, no slides * Three hours to connect, catch up, and build real relationships * Genuine conversations with practitioners, newcomers, students, and professionals from across the industry * Good energy, familiar faces — and plenty of new ones * Drinks right there if you want one **Who should come:** Anyone in or entering the cybersecurity space in the DMV. It doesn't matter if you've been in the industry for 20 years or you're still studying for your first cert. You belong here. Bring a friend. Seriously — the more the merrier. Tag someone who needs to be in this room. 📍 AC Hotel by Marriott Arlington National Landing 1999 Richmond Highway, Arlington, VA 22202 *(Metro accessible — Blue/Yellow Line, Crystal City Station)* 📅 Friday, May 1, 2026 🕕 6:00 PM – 9:00 PM RSVP so we know how many people to expect. See you soon! — Tyrone & the Cover6 Community team

**Caller: Richard Ades** **Band: The McKenzies** **Clinton Heights Lutheran Church** **15 Clinton Heights Ave, Columbus, OH 43202** WHAT IS CONTRA DANCING? Picture the Grand Ball scenes like you’ve seen in period films such as “Pride and Prejudice”, where the dancers are lined up in long lines, across from each other. That’s English Country Dancing, the predecessor of contra dancing. Now, add moves like “swing your partner” and “do-si-do,” like you’ve seen in square dancing. Set it to fabulous, high energy, live music with fiddles, guitars, percussion and more, alá “Riverdance.” Finally, set the whole scene down in the middle of Woodstock, with a hip, groovy atmosphere, a bit of tie-dye, and hints of counter-culture attitude. THAT’s Contra Dancing! Wear cool and comfortable clothes (you will get warm) and clean shoes that won't mark up our nice wood floor. Be sure to come for the beginner's lesson from 7:30 - 8:00, followed by dancing 8:00 - 10:30. All dances are taught; we will help you learn! Beginners always welcome, no need to bring a partner. Cost is $10.00 adults, $5.00 ages 12-26. Under 12 free. Free parking in church lot. For more information contact me or check out our website: [www.bigscioty.com](http://www.bigscioty.com/) Please bring your own refillable water bottle.

Bring your Raspberry Pi, Arduino, microcontroller, or any other electronic project and join fellow electronics makers for a night of creativity and collaboration! This session is open forum to share your current projects—whether complete or in progress, it’s all interesting! Whether you’re deep into embedded systems, exploring new ideas, or just getting started, you’ll find a welcoming space to collaborate, share, and get inspired. **New to electronics or curious about tinkering?** You’re absolutely welcome. If you’re a beginner and want to experiment, I’ll have a couple of starter kits available so you can try things out—whether that’s blinking your first LED, putting something on a display, or experimenting with simple sensors. No pressure and no experience required—just an interest in learning and building. While we continue to pursue a more permanent venue for this Meetup, we’ll be using public library facilities based on availability. This session will be at the Worthington Park Library in the Olentangy Meeting Room.

It’s time to take control of your mental health. How do you get rid of stress, anxiety and uncertainty? These emotions are buried deep in your reactive mind. Find out what the reactive mind is, and in the process find yourself. Have you ever suffered from a traumatic experience, a deep loss or been through a painful breakup? Has your ability to communicate suffered as a result? And after that, even though you "moved on" did you find that things were never quite the same? Have you ever looked at childhood photos, or reminisced your early life and wondered where that happiness and spark went? Are your emotions out of your own control? Have you ever felt, even if you aren’t aware of it, that possibly you are getting in your own way of your happiness and success? How does this affect your self-confidence? Find out what is at the root of all stress, anxiety, depression and self-doubt. Find out how and why you hold yourself back from achieving your goals and having the life you have dreamed of. As soon as you learn what is at the root of these unwanted conditions, you’ll see it is something you can DO something about. You will not be labeled or categorized at this MeetUp.

Come out to Improving for our monthly iOS and Mac meetings. This Month's Presentation: Nothing yet. (You should volunteer). What is Cocoaheads (http://cocoaheads.org/)? CocoaHeads is a group devoted to discussion of Apple Computer's Cocoa Framework for programming on MacOS X and iOS (including the iPhone, iPad and Apple Watch). During monthly meetings, members present on their projects and offer tutorials on various programming topics. What is BuckeyeCocoa (http://buckeyecocoa.org/)? BuckeyeCocoa is a group of Objective-C/Swift developers/enthusiasts. We host monthly Cocoaheads and near-weekly NSCoder meetings in Columbus, Ohio. The meetings are free to attend. Presentations! Presenters welcome! We are always in need of people willing to present material. Any Swift and/or Objective-C related topic is welcome. Times can be 5 minutes (i.e. lightning talks) to a maximum of 2 hours. Interested? Contact info is on the BuckeyeCocoa website. To volunteer for a presentation contact us at @BuckeyeCocoa on Twitter. Follow us on Twitter! @BuckeyeCocoa (https://twitter.com/#!/Buckeyecocoa/) For more information: http://buckeyecocoa.org/

Feeling down? Sometimes depressed? Can't focus? Negativity & stress? Recent losses? Creativity in career and personal life hindered by mental blocks? Sometimes we never fully recover from traumatic experiences. Whether it was yesterday, last week or a year ago, traumatic experiences - a loss of a loved one, losing a job, a breakup - can leave you scarred. You talk about it and feel a little better, but it never goes away. After you hang up the phone, it's still there; the sadness, the cloud, the over-thinking, the worry, the guilt. You try to focus, but you're blocked. You try to look forward into new experiences, new relationships but a cloud is hanging over you, casting a shadow on what you once considered a bright, cheerful future. What happened to your courage? Your strength of character? You're 'why not' attitude? Whoever said 'time heals' must have had a special time machine, because after weeks, months, years, you're wondering - when exactly does that kick in? Sometimes it seems like drinking or drugs are the way to go. But they wear off, and now the problem is still there with added side effects from the drugs. At this free local Meetup event we will talk about: * What causes grief, anxiety and depression to become chronic. * Is it possible to regain your joy and happiness even after traumatic experiences? * How to break away from negativity and focus on the future * What are the steps to take to get control of your mind and your emotions? Learn about a safe, gentle, do-it-yourself counseling that can be done in the comfort of your own home. Let's explore safe, effective solutions for healing from traumatic experiences. Be sure to click on the red "Attend" button below to come to the event. We look forward to seeing you there. This group is sponsored by the Dianetics & Scientology Life Improvement Center.

It feels like we just saw each other 🤷. Join members of the local design and UX community for our monthly breakfast. For May we’re stopping in for Rooh’s popup breakfast/cafe concept. You know someone is getting the lobster yuzu croissant, and that’s not even the prettiest thing on the menu!.

Central Ohio Radio Enthusiasts—CORE—is an informal community for anyone enthusiastic or curious about radio—whether you're new to radio and want to learn or you've been tinkering for years and want to share. Ham radio operators, GMRS users, Meshtastic fans, software-defined radio nerds, makers, and technical and non-technical folks are all welcome. No experience required or expected. This month we have **Radio Signal Analysis Using SDRs and OpenWebRX+** with **Scott McCrory**. Details are are [core.radio](https://core.radio/).