M5Stack Stamp-S3A WiFi and BLE IoT module benefits from optimized antenna design, lower power consumption

M5Stack Stamp-S3A, also known as M5StampS3A, is an update to the M5Stamp S3 ESP32-S3 module introduced in 2023 with an optimized antenna design, lower power consumption, a larger user button, and a different logic for the RGB LED control. Other features remain the same with 8MB Flash, RGB LED, input button, and 23 GPIOs all in a tiny 26 x 18mm form factor. Two versions are available: the Stamp-S3A without pre-soldered headers and the Stamp-S3A PIN1.27 with headers soldered on the board and an orange heat-resistant cover. M5Stamp-S3A specifications: WiSoC – Espressif Systems ESP32-S3FN8 CPU Dual-core 32-bit Xtensa LX7 microcontroller...

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Самодельные любительские радиолампы. Франция, 1920 г. Часть 1

Отжившие свой век, электровакуумные приборы (ЭВП) тем не менее в ограниченных и специальных случаях применяются и поныне, не говоря о моде на «ламповый звук» и цифровые индикаторы тлеющего разряда. Находит своих поклонников и любительское кустарно-лабораторное электровакуумное дело — как техническое ретрохобби — забава весьма сложная и многогранная: это и вакуумная техника, и химия, физика, электроника, и стеклодувное дело, и работа с высокими температурами и экзотическими материалами. Даже изготовление простой, более или менее современной, заводской лампы накаливания насчитывает сотни операций, повторять которые в точности для любителя и затруднительно, и не нужно. В этом смысле полезно бросить взгляд назад, к истокам, во времена появления...

Novomatic Coolfire. Самый навороченный игровой автомат двухтысячных

Приветствую всех!

Пару лет назад я уже рассказывал про игровые автоматы. И вот сейчас ко мне в руки попало довольно интересное железо — Novomatic Coolair, игровая платформа от одного из самых продвинутых производителей такого оборудования. Сегодня мы узнаем, как были устроены «топовые» игровые автоматы и как заставить работать начинку от них. Заодно соберём своего «механического гангстера», выиграем первый миллион и тут же его проиграем. Как водится, будет много интересного.

Listen To The Sound Of The Crystals

We’re all used to crystal resonators — they provide pretty accurate frequency references for oscillators with low enough drift for most of our purposes. As the quartz equivalent of a tuning fork, they work by vibrating at their physical resonant frequency, which means that just like a tuning fork, it should be possible to listen to them.

A crystal in the MHz might be difficult to listen to, but for a 32,768 Hz watch crystal it’s possible with a standard microphone and sound card. [SimonArchipoff] has written a piece of software that graphs the frequency of a watch crystal oscillator, to...

Hugging Face’s Reachy Mini is an open-source AI robot for your computer or Raspberry Pi 5

Better known for its artificial intelligence software solutions, Hugging Face has now introduced the Reachy Mini open-source desktop robot, designed to deploy AI applications that interface with the physical world. The robot comes with a camera, microphones, and a speaker, and can move its 6 DoF (degrees of freedom) head, rotate its body, or wave its antennas. Two versions are available: The Reachy Mini Lite designed for computers running Mac, Linux, and soon Windows, and the Reachy Mini autonomous robot, powered by a Raspberry Pi 5, adding wireless connectivity, a few more microphones, an accelerometer, and battery support. Both models...

DIY Navigation System Floats this Boat

https://invidious.privacyredirect.com/watch?v=-yAqIrRWtN0

[Tom] has taken a DIY approach to smart sailing with a Raspberry Pi as the back end to the navigation desk on his catamaran, the SeaHorse. Tucked away neatly in a waterproof box with a silicone gasket, he keeps the single board computer safe from circuit-destroying salt water. Keeping a board sealed up so tightly also means that it can get a little too warm. Because of this he under-clocks the CPU so that it generates less heat. This also has the added benefit of saving on power which is always good when you aren’t connected to the grid for...

Industrial 6-Channel RP2350 relay module offers RS485 interface, Raspberry Pi Pico HAT support

Waveshare RP2350-Relay-6CH is a Raspberry Pi RP2350-based industrial 6-channel relay module with an isolated RS485 interface, 7 to 36V DC input via a terminal block, and support for Raspberry Pi Pico HATs. Each relay is isolated and can handle 250VAC/30VDC up to 10A, a USB-C port is used for firmware updates, and the module also includes a buzzer, a few LEDs, as well as Reset and BOOT buttons, with everything housed in a DIN-Rail enclosure. Waveshare RP2350-Relay-6CH specifications: Microcontroller – Raspberry Pi RP2350B CPU Dual-core Arm Cortex-M33 @ 150 MHz with Arm Trustzone, Secure boot OR Dual-core RISC-V Hazard3 @...

Low-Cost WT99P4C5-S1 Pairs ESP32-P4 SoC with ESP32-C5 Wi-Fi 6 Module

Wireless-Tag’s WT99P4C5-S1 is a versatile multimedia development board built around the WT0132P4-A1 core module, which integrates Espressif’s ESP32-P4 dual-core RISC-V SoC. According to the company, this board targets applications such as AIoT, Human-Machine Interfaces, and edge computing, offering extensive connectivity, audio features, and multimedia expansion options. The ESP32-P4 runs dual RISC-V cores at up to […]

Double Your Printing Fun with Dual-Light 3D Printing

Using light to 3D print liquid resins is hardly a new idea. But researchers at the University of Texas at Austin want to double down on the idea. Specifically, they use a resin with different physical properties when cured using different wavelengths of light.

Natural constructions like bone and cartilage inspired the researchers. With violet light, the resin cures into a rubbery material. However, ultraviolet light produces a rigid cured material. Many of their test prints are bio-analogs, unsurprisingly.

Even more importantly, the resin materials connect naturally, so you don’t have as much worry about a piece made with two materials delaminating...