Software Defined Radio

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!

*Sometimes we invite Neurodivergent District members to join a virtual event from our Constellations community. We’re glad you’re here.* *Just to clarify, attending this event doesn’t include access to the Constellations member portal or membership. If you’d like ongoing access to events like this, along with curated member introductions for friendship or dating, you’re welcome to explore joining [Constellations](https://www.harringtonmatchmaking.com/constellations-membership).* Join us for a low-pressure in-person meetup at [Upside on Moore](https://upsideonmoore.com/) food hall. Located on Level “M2” at 1700 N Moore St, Level M2, Arlington, VA 22209. We’ll be meeting in the back near Ghostburger. If you’re sensitive to crowds or louder environments, this may not be the best fit. Click **[here](https://harringtonmatchmaking.as.me/schedule/0cfadc2d/?appointmentTypeIds[]=92645326)** to RSVP.

Have you been thinking about trying self-defense training, but do not want a loud, aggressive, or overly competitive environment? This free intro class is a simple way to get started. Maryland Systema offers practical self-defense training for adults in Takoma Park with a focus on movement, awareness, breathing, posture, and calm under pressure. This class is designed for beginners and first-timers who want real-world self-defense training in a welcoming setting. You do not need experience. You do not need to be in top shape. You do not need a martial arts background. You just need to show up ready to learn. This is not a sport-based class built around winning points, memorizing routines, or trying to look impressive. It is a more practical approach to adult self-defense training that helps you stay balanced, aware, and functional when things feel uncertain. If you have been searching for self-defense classes in Takoma Park, beginner self-defense near you, or practical self-defense training for adults, this class is a good place to start. **What you will work on** * Breathing and staying calm under pressure * Movement that improves balance and mobility * Awareness and posture * Simple partner drills * Practical self-defense training for beginners **Who this class is for** * Adults new to self-defense training * Beginners looking for a low-pressure class * People who want practical self-defense instead of sport martial arts * Adults in Takoma Park, Silver Spring, Rockville, and nearby areas looking for realistic self-defense classes **What to wear** Please wear comfortable workout clothes. No uniform is required. **Why start with this class** This free intro class gives you a chance to experience the training, meet the group, and see whether Maryland Systema is the right fit for you before joining regular weekly classes. **RSVP** Reserve your spot and come try a beginner-friendly self-defense class in Takoma Park.

Today we are Steve's Lab. RSVP and you'll be sent the location. It's in Silver Spring. ***Join us for an evening in an electronics lab where we will attempt to run clean scans of graphene and gold samples, and then clean up that data with post processing.*** This is a high sensitivity experiment, and we do not plan on being successful so early. But we've had promising results lately - so we will be putting in the time. We are NOT meeting at our usual location, but rather at Steve's house/lab. If you RSVP, you will get a DM with the address but it's located in Silver Spring. We will attempt full, clean lab - clean tip repeated scanning tests to see what we can learn and improve. We will experiment with online attendees, but if all possible showing up in person is strongly encouraged. Online join link is: - [https://meet.jit.si/mocomakers](https://meet.jit.si/mocomakers) Our community is building (and documenting for other teams) how to build a scanning tunneling microscope using a mix of common and 3D printed parts. This will allow us to scan and visualize a single atom - an ambitious we are doing over the course of a few months. The MoCo Makers community is one of the most innovative and competent groups in Maryland, and we've done everything from [publishing cancer research](https://pubmed.ncbi.nlm.nih.gov/38136356/), to [launching products](https://www.kickstarter.com/projects/gotim/cozy-curvy-multi-contour-pillow), [winning grants](https://covidinfocommons.datascience.columbia.edu/awards/2014255), and inspiring thousands. Now our biggest challenge yet has appeared. We are building a Scanning Tunneling Microscope, that will allow us to scan and visualize single atoms. To get a better idea of what we are doing, see our reference project here: [https://www.youtube.com/watch?v=7N3OqTEq08g](https://www.youtube.com/watch?v=7N3OqTEq08g) All starting CAD, code, and reference files should exist. However, let's be the first Maker community to document the build process and share it with learners around the world. We will be publishing our work here -[ https://hackaday.io/project/202816-qt-panda](https://hackaday.io/project/202816-qt-panda) If you need a ride, let us know.

**CHRONICLES:** **REGISTER** your character to aid in promptly and accurately reporting the session. You'll receive your chronicle sheet by email: https://www.rpgchronicles.net/session/08b59436-8d80-429f-b314-01efa7d6f61a/pregame **VENUE NOTE:** This event will be at Games and Stuff, however you do not need to pay the usual 10 dollar fee, as we have procured one of the private rooms! \*\*SYNOPSIS:\*\* A Pathfinder Society adventure for 5th-6th level characters, playable in 2-3 hours. During a routine meeting at the Anthusis Lodge, the Pathfinders are thrown off their guard when the city docks are attacked by a vengeful Chelaxian naval captain! The Pathfinders will need to hurry to help the citizens of Anthusis fight back against part of the Chelaxian fleet before winding up face to face with one of the most brutal captains in the navy. It's up to the Society to help remind Cheliax that Vidrian is a free nation! Written by Alexandria Bustion. Expected release date: May 6th, 2026 **Scenario tags:** Metaplot (Battle's Spark)

Ted Garber is a genre-bending multi-instrumentalist whose “BluesAmericanaRock” combines classic showmanship with a captivating singer-songwriter sensibility. His smokey, bluesy vocals, howling harmonica riffs and screaming guitar licks take us on a diverse musical journey from the Big Apple to the Big Easy, hovering in the Mississippi Delta before heading South of the Border. This is part of Montgomery County Parks Acoustics and Ale series. Bring a chair.

• What we'll do On https://blackecon101.podbean.com/ Thursdays at 6 pm. discussing the economy....

Come learn how money really works. We’ll cover how to grow it, protect it, get out of debt, and use smart retirement and infinite banking strategies to build long-term security.

Since its crash landing on the planet Akiton, the Wreck of the Returned has leaked volatile magic into the surrounding Sloughscar Hills. These effects have run the gamut from unseasonal storms, unnatural plant growth, and sudden bursts of magical energy to swaths of magically warped terrain, reality tears that transplant strange creatures, and regions of unstable reality that degrade matter entirely. In the ensuring months, these magical anomalies have become more frequent, more powerful, and more dangerous. When a sudden onslaught of magical catastrophes strikes all at once, First Seeker Sarmak dispatches teams of Starfinders to defend their allies, combat these threats, and counter this magical show of force with a concerted emergency response effort. When the dust settles, will the Starfinders stand strong and united? Or will they break under the magical assault? A Starfinder Society Scenario designed for 3rd- through 4th-level characters, playable in 2-3 hours. This is an adventure in the ongoing Invasion's Edge metaplot.

PLEASE CHECK THE ONLINE MEDITATION CALENDAR FOR DETAILS OF THESE MORE THAN 50 SERVICES A WEEK- https://onlinemeditation.yogananda.org/calendar/

Forro for Memorial Day! Join Lunna Gomes for terrific forró class to support the Afro Brazilian fest 2026. Lunna Gomes is DC's top forró instructor so this class will be terrific. Play with musicality, improve your ability to follow/ lead plus learn a fun dance pattern. Forró is Brazil's most popular partner dance for it's ease, terrific music and socialability. Meet new people and support a good cause. 100% of the revenue goes to Afro-Bahia Fest 2026. Class fee $15. Stay for delicious traditional feijoada too, and forro students get a discount 😋

🍷♠️❤️ A Spades Special - A Night of Cards & "Casual" Conversation 🍷♠️❤️ Thank you for all those who participated in our Speak & Spades Night on April 10! We are hosting another event at the same venue in Downtown Silver Spring - Comma's Food Hall inside City Place Mall. This time, it will be more about the game - a traditional night of Spades play, lots of laughs, and Friday fun. ♠️ Spades games will be the main event, from 6pm to 10pm! Play cards, eat, drink, & socialize! Enjoy drink specials and variety of reasonably-priced restaurant options. ❤️ Optional: If interested, conversation cards will be available in the room all evening. No formal discussion or official program is planned. Just engage in open, casual conversations about a variety of topics with those who may want to talk as well. No pressure. Singles and couples are invited! Get matched with a partner onsite. All skill levels are welcome. The fun starts at 6pm! 🍷 Happy Hour Specials all night! 🎶 Live music will be playing 🚗 Parking available in Ellsworth Garage (connected to the venue through the Skywalk) 📷 See the photo section for details 🌜Join us for a night of CARDS....with a little bit of conversation, if you like! Either way, you won't forget it!🌛 <><><><><><><><><><><><><><><

Playtesting Agent and Battle-scale of the Zone-17 role-playing and miniatures game.

[RSVP on Partiful](https://partiful.com/e/UCYdKHbiXcyGLGai3KJf?c=jn9txKC1) Join Network of South Asian Professionals at our monthly Third Thursday series on Thur, May 21, 6-9. Come to connect over careers or interests or just make some new friends. We ask guests to cover their own tab and we may continue the night with a walk to the wharf after the event. RSVP at our partful link to see who is coming. See you soon!

**Important time note:** Please plan on arriving between 5:30 and 6:00 as the elevators lock after 6 and you'll need to message us and we'll need to come get you. The building address is 4450 Bridge Park The entrance is 6620 Mooney St, Suite 400 You will need to scan your ID at the door to get a visitor badge. **Abstract** Like it or not, AI agents are now capable of turning a quickly written paragraph of requirements into a pull request that is ready to be integrated into real-world production applications and it's now our responsibility to make sure AI doesn't go rogue and take down prod - or corrupt our data by misunderstanding the requirements or our existing schemas. In this session we'll explore strategies to protect our codebases through unit and integration testing, documentation, and code review along with additional ways of providing context and guard rails to our AI agents as they carry out the work we've assigned them to do. By the time we're done, you'll have a firm grasp of the problem and understand some helpful options for protecting your codebase from vibe coding mishaps getting YOLOed into prod. **YouTube Link** TBD

Bring your work or your hobby, hang out, and code with us. Follow @buckeyecocoa for more information.

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.

PLEASE NOTE!!! This event will be In-Person for our very 1st Improving collab! If you know the [Columbus Unity group](https://www.meetup.com/columbus-unity-user-group/) location, we'll be at the same place. This is our 1st event and are doing a soft launch with limited attendance. 1st come 1st serve. If you want to be there and we fill up, please email me at [info@thecogg.com](mailto:info@thecogg.com) and I'll be in touch. All street parking is free on Sundays but you can also pay to park in any of the local garages. See image of [parking map here](https://drive.google.com/file/d/1Mr9_LFIggbs-0_Zd3AJTGNqEhgMf2TzQ/view?usp=sharing). \-\-\- On the last Sunday of the month, we're having our usual end-of-the-month social gathering with our GameDev Meetup meeting. There will be announcements and presentations followed by some social networking Let's continue the conversations with good vibes and friends. All are welcomed from all ages and backgrounds to this public event. If we can, we'll be streaming or uploading the video later via our COGG YouTube channel here: [https://www.youtube.com/@TheCOGG/streams](https://www.youtube.com/@TheCOGG/streams) (Also please do subscribe if you have not done so!) No game development experience required! If you are interested in doing a 20 minute game development related presentation, please fill out our form online here: [https://goo.gl/forms/lVdTJZiNJewlPJuj1](https://goo.gl/forms/lVdTJZiNJewlPJuj1) Or e-mail us at info@thecogg.com with the following: Your Name, Company/Affiliation, Name of Your Game/Topic, Description, Tech Needs, and Your Contact. Be sure to check out our Discord for real time news updates: [https://discord.gg/NrBhuNQ](https://discord.gg/NrBhuNQ)

TOPIC (TBD): Meeting Schedule: 1. 6:00 - Introduction, Meet New Members 2. 6:10 - Old Business 3. 6:20 - New Business 4. 6:30 - Pre-Shoot Briefing/Education 5. 7:15 - Break 6. 7:30 - Image Critique 7. 8:00 - Adjourn Pre-Shoot Brief/Education: NIK Collection 8 Image Critique: Previous Photoshoot Images (iPhone images and Christmas Cards). If anyone has images they would like critiqued, please provide them at the beginning of the meeting. Providing Images for Critique: For now, I will collect images at the beginning of the meeting on a USB memory stick. My computer has USB-C ports, so a USB-C memory stick or one with dual (USB-C / USB-A) ports will be needed. Images should follow these format rules: JPG - 80% quality or higher 132 dpi resolution 2048 pixels across the long edge Embedded colorspace - sRGB

Christians in Tech is a community at the intersection of faith and technology. Our meetups are designed to spark meaningful conversations, promote knowledge sharing, and encourage growth—both in your career and your spiritual walk with God. Whether you're an experienced professional or just starting your tech journey, CIT welcomes you. Our Website [https://linktr.ee/citcbus](https://linktr.ee/citcbus) Sponsors and Partners * Improving (Venue Sponsor) * Bethel World Prayer Center (Fiscal Sponsor) * Fruits & Roots (Coffee Partner)

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/