Hackin7
The repository README credits Hackin7 for art, rough PCB layout/routing, and some embedded work; Hackin7 also published the r/Defcon preorder post.
SourceDEF CON Singapore 2026 · Singapore · 2026
DEF CON Singapore 2026 HFSDR Badge
Unofficial CH32V305 SDR badge preorder
A community HFSDR badge preorder for DEF CON Singapore 2026, documented through Hackin7's r/Defcon preorder post and the linked public rhgndf/hfsdr hardware, firmware, host-software, and WebUSB archive.
SeriesDEF CON Singapore
LocationMarina Bay Sands, Singapore
CountrySingapore
People
Authors & Credits
rhgndf
The HFSDR repository README credits rhgndf for schematic and internal design work.
SourceDEF CON Singapore
Official DEF CON Singapore event page publisher used for date, venue, and event-context evidence; not a source for official HFSDR badge status.
Sourcettrftech / CentSDR
The HFSDR README credits ttrftech's CentSDR as a reference lineage.
SourceWhy It Mattered
It adds a current Singapore badgelife record while keeping the source boundary explicit: the official DEF CON Singapore page proves the event, the Reddit preorder proves the community pickup/sales context, and the GitHub archive proves the SDR device implementation. The record does not present the HFSDR as the official DEF CON Singapore admission badge.
Hardware
The preorder post describes a mini solder kit with badge PCB, SMA connector and antenna, encoder, screen, two SMD LEDs and resistors, optional battery, RF receive up to 300 MHz, onboard FM demodulation, waterfall/FFT display, blinky LED modes, a LiPo charger, and reprogrammability. The repository preserves CH32V305 firmware and KiCad hardware directories for the HFSDR USB device, while the host guide documents USB vendor ID 0xCAFE, a TinyUSB-derived product ID, vendor interface 4, and bulk endpoints for streamed samples.
Software & Apps
The repository documents portable rotary-encoder behavior for FM audio and LED modes, WebUSB pairing/configuration, Python/GNU Radio host examples, a CH32V305 firmware build/flash workflow, and a USB sample-stream protocol that reconstructs I/Q samples from little-endian 16-bit words. The linked Lain-themed web UI is treated as a related user-interface resource, not as proof of every shipped firmware feature.
Lore
Hackin7 first gauged demand for a DEFCON SG SDR badge, then opened preorders for collection at DEFCON SG with possible later pickup at Hackaday Europe or DEFCON US. The repository credits rhgndf for schematic/internal design, Hackin7 for art and PCB layout/routing work, and CentSDR as a reference lineage.
Lifecycle
Add-ons & Upgrades
community distribution
source-backed
DEFCON SG preorder and pickup
Hackin7's preorder post offered the HFSDR badge for collection at DEFCON SG, with battery and no-battery kit pricing and possible later handoff at Hackaday Europe or DEFCON US.
Source
firmware release
post-event release
HFSDR v1.0/v1.1 release trail
The GitHub release trail now includes v1.0 during DEF CON Singapore and v1.1 afterward, with v1.1 documenting new graphics and a USB streaming reliability fix.
Source
hands-on soldering
source-backed
Mini solder kit assembly
The preorder kit included solderable LEDs/resistors and SMA connector work, plus badge PCB, antenna, encoder, and screen.
Source
host software
source-backed
GNU Radio and Python host tools
The host guide documents a Python probe and GNU Radio examples for streaming samples from the HFSDR USB device.
Source
standalone behavior
source-backed
Portable FM and LED modes
The repository README documents rotary-encoder controls for FM audio output and cycling LED modes when the device is used without a PC.
Source
web interface
source-backed
WebUSB SDR configuration
The repository describes pairing through the WebUSB UI, setting frequency and gain, pairing again, and then observing the waterfall.
SourceOperational history
Issues & Camp Impact
hardware archive scope
note
The public archive preserves firmware, host software, and a hardware directory, but this pass does not reconcile final manufactured units, BOM revisions, production lot, or full shipped feature parity with the preorder list.
Hardware claims are limited to preorder text, repository structure, README behavior, and host-guide protocol documentation.
- Confidence
- source-backed but incomplete
- Status
- needs post-event production reconciliation
- Timeframe
- current public archive
- Source note
- r/Defcon preorder post, rhgndf/hfsdr README, host guide, and CH32V305 firmware README.
missing rights-cleared image
note
No HFSDR image is published because the Reddit and repository images, including docs/img/hfsdr.png and art export PNGs, have not been paired with a reusable image license, exact attribution, and processing provenance for badge.gallery publication.
The Singapore record remains source-backed and image-free rather than copying social-media previews, repository screenshots, repository artwork, or generated imagery.
- Confidence
- local project policy
- Status
- needs licensed original replacement
- Timeframe
- current catalogue build
- Source note
- badge.gallery image policy, r/Defcon preorder post, rhgndf/hfsdr repository, and 2026-05-21 repository contents recheck.
post-event release scope
note
The HFSDR repository release list still has v1.0 on 2026-04-29 and v1.1 on 2026-05-18 as of the 2026-05-21 recheck, but public sources still do not confirm shipped quantity, every final manufactured-unit revision, or official admission-badge status.
The record is stronger for firmware artifacts but remains classified as community/unofficial unless an official DEF CON source identifies it as the official conference badge.
- Confidence
- repository release trail plus first-hand community post
- Status
- post-event firmware release found; latest rechecked
- Timeframe
- DEF CON Singapore and May 2026 release trail
- Source note
- HFSDR v1.0 and v1.1 release pages, GitHub API releases listing rechecked 2026-05-21, r/Defcon HFSDR preorder post, and DEF CON Singapore event page.
repository license caveat
note
A 2026-05-21 GitHub API and repository-contents recheck found `license: null` and still did not recover a LICENSE, LICENSE.md, or COPYING file in the public HFSDR repository.
The catalogue cites repository facts as public evidence but does not reuse repository images, hardware files, or code assets as licensed local content.
- Confidence
- current repository audit
- Status
- needs license clarification
- Timeframe
- current catalogue build
- Source note
- rhgndf/hfsdr GitHub API repository metadata and contents listing, rechecked 2026-05-21.
unofficial badge classification
note
The official DEF CON Singapore page establishes the conference, while the HFSDR sources are community/repository sources. No reviewed official DEF CON page identifies HFSDR as the official event admission badge.
The record is included as a source-backed community badgelife artifact connected to DEF CON Singapore, not as an official DEF CON badge claim.
- Confidence
- official event page plus community preorder
- Status
- documented
- Timeframe
- DEF CON Singapore 2026
- Source note
- DEF CON Singapore event page, r/Defcon preorder post, and rhgndf/hfsdr repository.
Resources
DEF CON Singapore 2026 event page
event page · Official DEF CON page documenting the April 28-30, 2026 Singapore conference at Marina Bay Sands; it anchors the event context but does not label the HFSDR as the official event badge.
HFSDR CH32V305 firmware README
firmware documentation · Firmware build and flash notes for the CH32V305 SDR target, including CMake/Ninja/toolchain setup and wchisp flashing workflow.
HFSDR WebUSB UI source tree
web UI source · Repository UI source tree for the WebUSB interface used to pair, configure frequency and gain, and display the SDR waterfall; the GitHub Pages deployment timed out during a May 21, 2026 reachability check.
HFSDR host guide
protocol documentation · Repository guide documenting Python and GNU Radio host examples, USB vendor/product/interface details, bulk endpoints, sample-stream format, and WebUSB landing-page descriptor request.
HFSDR interest-gauging post
community source · Earlier Hackin7 post establishing the public development thread for a DEFCON SG SDR badge and linking forward to the preorder thread.
HFSDR preorder post
community preorder · Hackin7's r/Defcon preorder post documenting the DEFCON SG collection context, kit contents, pricing, SDR/FM/waterfall/FFT features, soldering kit details, and link to the public HFSDR repository.
HFSDR user manual slides
user manual · Repository-linked user manual slide deck for the HFSDR device.
HFSDR v1.0 release
firmware release · Release published during DEF CON Singapore on 2026-04-29 with an hfsdr.elf asset, anchoring a post-event firmware artifact beyond preorder text.
HFSDR v1.1 release
firmware release · Post-event release published 2026-05-18; release notes document new graphics and a USB streaming reliability fix.
Lain-themed HFSDR UI source tree
alternate web UI source · Hackin7 repository UI source tree for the related Lain-themed interface; the GitHub Pages deployment timed out during a May 21, 2026 reachability check.
rhgndf/hfsdr repository
hardware and firmware archive · Public HFSDR archive preserving host software, CH32V305 firmware, KiCad hardware tree, scripts, documentation, WebUSB links, portable mode notes, and project credits.
Sources
DEF CON: DEF CON Singapore
Retrieved 2026-05-15 · Official event-context source for the April 28-30, 2026 DEF CON Singapore conference at Marina Bay Sands; this source does not identify the HFSDR as an official DEF CON badge.
GitHub / rhgndf: rhgndf/hfsdr
Retrieved 2026-05-15 · Primary repository source for HFSDR host software, firmware, hardware design tree, CH32V305 firmware path, WebUSB links, portable mode behavior, user manual link, and project credits.
GitHub / rhgndf: HFSDR host guide
Retrieved 2026-05-15 · Primary protocol source for Python/GNU Radio host workflows, USB IDs/interface/endpoints, I/Q sample reconstruction, stream format, and WebUSB descriptor behavior.
GitHub / rhgndf: HFSDR CH32V305 firmware README
Retrieved 2026-05-15 · Primary firmware source for CH32V305 SDR target build prerequisites and flashing workflow.
GitHub / rhgndf: HFSDR v1.0
Retrieved 2026-05-15 · Release source published 2026-04-29 with an hfsdr.elf artifact, giving the HFSDR record a post-event firmware-release anchor.
GitHub / rhgndf: HFSDR v1.1
Retrieved 2026-05-15 · Release source published 2026-05-18 documenting new graphics and a USB streaming reliability fix.
r/Defcon / Hackin7: hfsdr preorders for DEFCON SG
Retrieved 2026-05-15 · First-hand community preorder source for DEFCON SG pickup, HFSDR kit contents, SMA/antenna/encoder/screen/LED parts, 50-60 SGD pricing, RF up to 300 MHz, onboard FM demodulation, waterfall/FFT display, LiPo charger, reprogrammability, and repository link.
r/Defcon / Hackin7: Gauging interest in DEFCON SG SDR badge
Retrieved 2026-05-15 · Earlier public source tying Hackin7 to development of a DEFCON SG SDR badge and documenting the intended FM/SDR scope before preorder publication.