TECH NEWS

This PCB Business Card Uses NFC Power to Animate 21 LEDs

Sometimes the best projects get started as a learning experience. That’s what happened with Wilson Harper, who wanted to learn KiCad. He picked what seemed like a relatively simple first project: designing a PCB business card. Three months later, that card had turned into a lesson in NFC energy harvesting, RF antenna design, Charlieplexing, power management, and bare-metal microcontroller programming.

The finished PCB business card has no battery, but tapping it against a smartphone provides enough power to run an ATtiny816 microcontroller and animate 21 LEDs. It also works as a conventional NFC business card, allowing a phone to pull up Harper’s contact information.

Smartphone NFC readers generate a small magnetic field that induces current in the card’s antenna. Ordinary NFC tags use this harvested energy to power the circuitry needed to communicate with the phone, but some NFC chips can also make excess energy available to external hardware. Harper...

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I tested the Instax Pal 2 for three weeks and it’s the ultimate retro toy camera — except for the price tag

A dinky and retro design, audible and tactile controls, vintage-look photos, plus wireless image uploads and easy sharing — it’s easy to love lots of things about the Instax Pal 2. However, frustrating shutter lag, poor battery life and a lofty price tag are less welcome. It's a

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Oura shelves its $2.2B IPO citing ‘uncertainty’ in the market

In Brief 7:56 AM PDT · September 29, 2026 Smart ring maker Oura has postponed its up to $2.2 billion IPO indefinitely, citing “uncertainty in the IPO market.” The company, which had filed to offer 55 million shares at a range of $40 to $44 each in the IPO,

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After losing his voice to cancer, this founder is building “glasses for voice”

Konrad Zieliński lost his voice to cancer years ago while he was a student at the University of Warsaw. People with his condition have traditionally relied on handheld speaking devices that sound flat and robotic, or on surgically implanted voice prostheses, which require ongoing maintenance to prevent complications, Zieliński told

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The NordicTrack Commercial 2450 Combines Big Speed With Smart Adjustment Features

Quick Answer:Combining a wide variety of real-time response features, the NordicTrack Commercial 2450 adjusts itself based on your fitness level and goals, as well as your heart rate, offering a unique workout every time you show up. Marathon season is back — and so are your training goals. You want

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I tested the Instax Pal 2 for three weeks and it’s the ultimate retro toy camera — except for the price tag

Oura shelves its $2.2B IPO citing ‘uncertainty’ in the market

After losing his voice to cancer, this founder is building “glasses for voice”

The NordicTrack Commercial 2450 Combines Big Speed With Smart Adjustment Features