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The speech synthesizer you always wanted for your Apple II, but couldn't afford back in the day - now you can!
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Perfect Paul ][ - DECtalk for the Apple ][

michael-wesselMichael Wessel

FM synthesizer and drum machine with full sound editing, modified from a Yamaha 1980’s home keyboard with fixed sound presets.
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DRX70 – FM synthesizer module

jkn0JKN0

Open-source USB-C wall display for PM2.5 air quality, built on Seeeduino XIAO SAMD21, with color LEDs, auto brightness, 0.1 µg/m³ steps.
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USB-C wall display for PM2.5 air quality

aleksei-tertychnyiAleksei Tertychnyi

Solar powered LoraWAN node for continuous air quality monitoring based on Wio-E5 and SEN54 Sensirion sensor
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pollutagNode2 - Air Quality Monitor - LoRaWAN

aleksei-tertychnyiAleksei Tertychnyi

Follow for the 'Hacklet' and latest news about hackaday.io
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Hackaday.io Project

lutetiumLutetium

An ESP32-powered desk gadget with six round displays, with one touch its start spinning.
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YUMO Roulette — A "Floating" Spinning Desk Gadget

yumobuildsYUMO.BUILDS

Two board 6809 (or 63C09) computer that fits in to an Altoids Mint tin.
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6809/63C09 Membership Card

kevinKevin

The evolution of my previous GS-65, coming with faster RAM and more expansion options
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GS-X65 | 65C02 10MHz PC

gabrieleGabriele

XTT is an offline-first, open-hardware archery training system that measures bow movement and provides real-time feedback.
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XTT - Open Hardware Archery Training System

jan-le-rouxJan le Roux

Where I apply lessons learned to make a monitor for a 1970s era personal computer.
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A Better Small CRT Like Monitor For Retro Projects

michael-gardiMichael Gardi

Full stack Forum software based on phpBB and Stargate Portal using Claude (4.6)
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Ai Generated Full Stack Forum & Portal

michael-otooleMichael O'Toole

A carrier for the WIZnet W5500-EVB-Pico2: 1 W LoRa, PoE power and Ethernet over a single cable, for Meshtastic and APRS.
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W5500-EVB-Pico2 + E22P: a one-cable PoE LoRa node

carlos-valdesCarlos Valdes

The Open Source Charm Camera that anyone can make and repair/mod.
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FairCharm

emanuele-carlinoEmanuele Carlino

Currently creating a motion simulated CAD drawing with an LLM
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PLANTINATOR 2026 - Seedling Transplanting Machine

goat-industriesGOAT INDUSTRIES

Using an over-the-air audio loop to store data.
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Air Delay Line Memory

benBen

Text on a small display should come alive. It started with clock digits made of Bézier curves; this is where the idea went.
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Bringing Text to Life on an ESP32

anton-petrusevichAnton Petrusevich

Going up?

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