admin writes that multiple independent projects have discovered an undocumented feature in ESP32 chips that bypasses standard WiFi and Bluetooth functions to capture raw IQ baseband samples. This allows several ESP32 models to operate as internal SDRs covering 2.2–2.7 GHz, with the ESP32-C5 extending to 4.8–6.0 GHz at up to 80 MS/s. While most implementations are limited to snapshot-based spectrum analysis due to bandwidth constraints, the new ESP32-S31 supports continuous streaming over Gigabit Ethernet. Other projects have leveraged this feature to enable phase-coherent direction finding and a 5.8 GHz FPV video receiver.
- The ESPARGOS team is not implementing phase-coherent transmissions due to misuse concerns.
- An FPGA-based prototype by user h0m3us3r streams data continuously, though it has poor phase noise.
- The C5VRX project utilizes the undocumented IQ stream for a 5.8 GHz FPV video receiver.
- The ESPARGOS team is not implementing phase-coherent transmissions due to misuse concerns.
- An FPGA-based prototype by user h0m3us3r streams data continuously, though it has poor phase noise.
- The C5VRX project utilizes the undocumented IQ stream for a 5.8 GHz FPV video receiver.
Jenny List writes about how an undocumented feature in certain ESP32 chips allows the raw I/Q stream to be tapped before the WiFi modem, effectively turning them into software-defined radio receivers. Discovered independently by Espargos and a Reddit user, the mode supports both 2.4 and 5 GHz bands but is limited to receive-only operation.
- Only works on ESP32 variants with earlier Tensilica hardware; Bluetooth-only and non-radio P4 chips won't work
- Transmit capability appears possible but remains undocumented, with the discoverer refusing to share due to "rule 3"
- The 80 Msps 32-bit/sample data rate creates bandwidth challenges for external transfer via SDIO or UART interfaces
- Only works on ESP32 variants with earlier Tensilica hardware; Bluetooth-only and non-radio P4 chips won't work
- Transmit capability appears possible but remains undocumented, with the discoverer refusing to share due to "rule 3"
- The 80 Msps 32-bit/sample data rate creates bandwidth challenges for external transfer via SDIO or UART interfaces
Giorgio Mendoza writes that Makerfabs has released the MaTouch ESP32-S3 7.5-inch Quad-Color E-Ink board, pairing an 800×480 four-color electrophoretic display with an ESP32-S3R8 controller, a four-microphone array, a six-axis IMU, and microSD storage for low-power displays and voice-controlled interfaces.
- Priced at $59.80, with an optional OV3660 3-megapixel camera adding $4.80
- The E Ink panel uses a JD79665 controller with a full-screen refresh time of about 20 seconds
- Software support includes ESP-IDF 5.4.2 and Arduino, with published examples for camera capture and voice-activated image browsing
- The board supports 2.4GHz Wi-Fi and Bluetooth 5 LE, with 8MB PSRAM and 16MB SPI flash
- Priced at $59.80, with an optional OV3660 3-megapixel camera adding $4.80
- The E Ink panel uses a JD79665 controller with a full-screen refresh time of about 20 seconds
- Software support includes ESP-IDF 5.4.2 and Arduino, with published examples for camera capture and voice-activated image browsing
- The board supports 2.4GHz Wi-Fi and Bluetooth 5 LE, with 8MB PSRAM and 16MB SPI flash
Tom Nardi writes that Mateusz Juszczyk has created a desktop gadget called ESP32-Plane-Radar, which uses an ESP32-C3 Super Mini and a round GC9A01 display to visualize aircraft movement. Rather than using actual radar hardware, the device connects via WiFi to adsb.fi to pull crowdsourced Automatic Dependent Surveillance–Broadcast (ADS-B) flight data, creating a professional-looking circular radar display that reflects real-world local airspace activity.
- The project features a minimalistic 3D printed enclosure for its components.
- A web-based configuration interface is included for easier setup via WiFi.
- Despite the name, it does not sniff ADS-B signals directly from radio waves but uses internet data instead.
- The project features a minimalistic 3D printed enclosure for its components.
- A web-based configuration interface is included for easier setup via WiFi.
- Despite the name, it does not sniff ADS-B signals directly from radio waves but uses internet data instead.
socquique writes of Capsule Radar, a live ADS-B aircraft radar designed for the Waveshare ESP32-S3-Touch-AMOLED series (1.75 and 1.43 inch round displays). The software pulls real-time flight data via WiFi to plot nearby aircraft on various visual themes like Phosphor or Orb, offering touch interaction for detailed flight information such as routes and altitude.
- Supports browser-based flashing via ESP Web Tools
- Includes a native SDL2 desktop simulator for testing without hardware
- Features automated route lookups using adsbdb
- Provides "face-down" sleep mode triggered by the onboard IMU
- Compatible with Waveshare's 1.75 and 1.43 AMOLED boards
- Supports browser-based flashing via ESP Web Tools
- Includes a native SDL2 desktop simulator for testing without hardware
- Features automated route lookups using adsbdb
- Provides "face-down" sleep mode triggered by the onboard IMU
- Compatible with Waveshare's 1.75 and 1.43 AMOLED boards
tzapu writes about WiFiManager, an Espressif ESPx WiFi connection manager featuring a fallback web configuration portal. The library allows devices like the ESP8266 and ESP32 to automatically enter Access Point mode if they cannot connect to a saved network, enabling users to configure credentials via a captive web portal from any device with a browser.
- Supports both ESP8266 and ESP32 platforms
- Features a captive portal that redirects all traffic to the configuration page
- Includes support for custom parameters beyond SSID and password (e.g., MQTT settings)
- Provides language switching options including German, Spanish, French, Portuguese, and Brazilian Portuguese
- Supports on-demand configuration portals via a trigger pin or software command
- Supports both ESP8266 and ESP32 platforms
- Features a captive portal that redirects all traffic to the configuration page
- Includes support for custom parameters beyond SSID and password (e.g., MQTT settings)
- Provides language switching options including German, Spanish, French, Portuguese, and Brazilian Portuguese
- Supports on-demand configuration portals via a trigger pin or software command
Tyler August writes that the Cheap Yellow Display (CYD) ESP32 dev boards can be transformed into a Portable Digital Assistant, reminiscent of 1990s Palm devices. Rather than using an emulator, user sau412 developed custom firmware for the CYD that includes features like a Gopher browser, RSS and Wikipedia readers, various games, a BASIC interpreter, a calendar, calculator, contact list, ebook reader, and translator.
- The project can be set up in approximately five minutes using a web-based flasher.
- An SD card is required to test all the available applications.
- This project provides an alternative for those looking for Palm OS-style functionality on modern hardware without needing x86 or ARM emulators like Pumpkin OS.
- The project can be set up in approximately five minutes using a web-based flasher.
- An SD card is required to test all the available applications.
- This project provides an alternative for those looking for Palm OS-style functionality on modern hardware without needing x86 or ARM emulators like Pumpkin OS.
Maya Posch discusses the transition from IPv4 to IPv6, noting how fundamental networking concepts like UDP broadcasting and subnetting change in an IPv6 environment. While IPv6 simplifies some aspects by treating broadcasting as a form of multicasting via specific addresses and eliminating traditional subnets through massive address spaces (like /64 prefixes), it introduces complexities regarding service discovery and the lack of direct NAT compatibility.
- In IPv6, UDP "broadcasting" is achieved using a link-local multicast group at `ff02::1`.
- The standard IPv6 subnet size is `/64`, providing an address space roughly four billion times larger than typical IPv4 subnets.
- Transitioning between protocols can be difficult due to the lack of direct compatibility, often requiring dual-stack implementations or encapsulation.
- NPTv6 (Network Prefix Translation) exists as a way to perform NAT-like functions with prefixes rather than individual addresses in IPv6.
- In IPv6, UDP "broadcasting" is achieved using a link-local multicast group at `ff02::1`.
- The standard IPv6 subnet size is `/64`, providing an address space roughly four billion times larger than typical IPv4 subnets.
- Transitioning between protocols can be difficult due to the lack of direct compatibility, often requiring dual-stack implementations or encapsulation.
- NPTv6 (Network Prefix Translation) exists as a way to perform NAT-like functions with prefixes rather than individual addresses in IPv6.
bebechien writes about DinoDesk AI, a LEGO dino desk companion built on a Raspberry Pi that pairs a local Gemma 4 model (via LM Studio) with cloud Gemini Flash through a unified OpenAI-compatible gateway, giving users a camera-free, privacy-first chat robot with three switching modes (local, cloud, and auto-hybrid routing). The physical body uses LEGO Technic lever mechanisms for neck and tail movement, a Pimoroni Pirate Audio shield for the 1.3" LCD eyes and 8-bit I2S beeps, and a 5-state finite state machine to coordinate expressions, sound, and motor action across Sleeping, Idle, Listening, Thinking, and Speaking states.
- Auto-hybrid mode uses a complexity classifier that detects multi-step reasoning keywords like "explain," "compare," and "write code" to transparently escalate prompts to the cloud engine
- The project is open-sourced at github.com/google-gemma/dinodesk-ai-companion
- Full voice chat is still a work in progress; current interaction is triggered by a physical red push button
- A commenter noted that absence of a camera does not guarantee voice data stays local, and suggested an explicit retention boundary for audio transcripts would strengthen the privacy claim
- Auto-hybrid mode uses a complexity classifier that detects multi-step reasoning keywords like "explain," "compare," and "write code" to transparently escalate prompts to the cloud engine
- The project is open-sourced at github.com/google-gemma/dinodesk-ai-companion
- Full voice chat is still a work in progress; current interaction is triggered by a physical red push button
- A commenter noted that absence of a camera does not guarantee voice data stays local, and suggested an explicit retention boundary for audio transcripts would strengthen the privacy claim
