diy projects
This NFC Business Card Lights Its LEDs With Borrowed Phone Power
Kevin Tang's PCB business card lights up with no battery on board, pulling about 5 mA from the phone's own 13.56 MHz NFC field.
diy projects
ATtiny816 PCB Business Card Runs 21 LEDs on Harvested NFC Power
No battery, no charging port. This PCB business card harvests power from your phone's NFC field to run an ATtiny816 and light 21 Charlieplexed…
diy projects
How ExpressLRS Squeezes Kilometers Out of a 1-Watt ESP32 Link
Four open-source ELRS receivers, an SX1280 LoRa radio, and one 50-ohm trace: the RF design tricks that keep a 1-watt link locked kilometers out.
diy projects
DIY PLC on a PocketBeagle 2: Is a $1,000 Allen-Bradley Fair?
A $1,000 PLC versus a $10 dev board: element14's Clem Mayer built his own on a PocketBeagle 2 to find out exactly where the…
diy projects
This Arduino Nano-Sized Board Packs a 300 MHz Cortex-M7 Chip
Magmabow squeezed a 300 MHz ATSAME70 Cortex-M7 into an Arduino Nano footprint, and the BGA routing trick he used is worth stealing.
diy projects
This $155 Open-Source 6-DoF Stylus Replaces $5,000 Mocap Rigs
Aalto University's open-source Lighthouse Stylus tracks position and tilt to under 1 mm for about $155 in parts, against $5,000+ for commercial mocap.
diy projects
Raspberry Pi Book of Making 2027: A Weekend Build Queue
The Book of Making 2027 collects a year of magazine builds: origami paper circuits, a PVC-pipe underwater rover, and a first-PCB walkthrough to try.
news & releases
Antmicro Open-Sources KiCad Files for a 10GbE Thunderbolt NIC
Antmicro released full KiCad files for a permissively licensed dual 10GbE Thunderbolt card, a free reference design for learning high-speed PCB layout.
diy projects
A Palm-Sized Battery Bench Power Supply Built on the ATtiny3216
Ben Makes Everything built a palm-sized battery bench power supply with 0.8V to 22V output, USB-C PD charging, and an ATtiny3216 running the show.
diy projects
This Giant ATmega Chip Doubles as a Qi Wireless Charger
Nick Electronics supersized the ATmega chip every Arduino fan loves into a working Qi wireless charger, three prototypes and one 90C meltdown later.
diy projects
Bitluni’s 8,192-Core DIY GPU Is Built From 13-Cent RISC-V Chips
8,192 RISC-V microcontrollers, six-layer blades, 650 amps and a pogo-pin flashing rig. Inside the cheapest, strangest GPU ever soldered together.
news & releases
Eight Free Maker Tools Just Launched at Circuit.Rocks
Eight free maker calculators just landed at Circuit.Rocks: LED resistor, voltage divider, PCB trace width, logic-level checker, BOM-to-Cart, and more. No login, instant math,…