arduino
Arduino UNO Q Smart Doorbell Runs Its Vision Model On-Device
Banzi and Richetta live-build a doorbell whose face recognition never leaves the board. Here is the UNO Q hardware behind it and what you…
raspberry pi
Build a Private Second Brain on Raspberry Pi With Logseq
Keep your notes, references and thesis research on hardware you own: Logseq plus Syncthing turns a Raspberry Pi into a private knowledge base.
diy projects
A Raspberry Pi 5 E Ink Frame That Paints the Birds It Hears
A microphone under the eaves, a Raspberry Pi 5 running BirdNET locally, and an A4 E Ink panel that redraws itself with 1800s bird…
iot & smart home
Tiny Contacts Fits Four Relays Onto a 42 x 38 mm ESP32 Board
Four Omron surface-mount relays on a 42 x 38 mm board, driven by a ULN2003A so your ESP32 GPIO pins never touch a relay…
diy projects
Build a Pocket Signal Generator With the AVR16EB28 and an OLED
An AVR16EB28, a 4.194304 MHz crystal and a spare pair of I/O lines make a 2 Hz to 33 MHz square-wave signal generator that…
diy projects
Brass Tubing Is the Frame and the Ground in This ESP32 Handheld
No PCB, no printed shell. Huy Vector bent 2 mm brass tubing into a handheld console frame and used the metal itself as the…
microcontrollers
warecache Sensor Bins Count Your Parts Using an STM32H723
Sensor-equipped bins weigh their own contents and report over MQTT, so the parts count stays honest. Inside the STM32H723 hardware behind warecache.
microcontrollers
Seeed XIAO SAMD21 Plus and RP2040 Plus Double the GPIO Count
Seeed kept the postage-stamp footprint but pushed the XIAO SAMD21 to 30 GPIO and the RP2040 to 29, with onboard battery charging from $4.90.
diy projects
No CPU, No Software: This Neural Net Lives Inside an Artix-7 FPGA
A Basys 3 FPGA recognizes handwritten digits in half a millisecond with no processor, no OS, and no inference library. Just 25,888 weights turned…
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.
microcontrollers
Olimex’s Neo6502kbd Hides a Real MOS 6502 Inside a 50-Euro Keyboard
Olimex put a genuine WDC W65C02 under a wedge-shaped keyboard, paired it with an RP2040 for video and USB, and priced the Apple II…
diy projects
Seeed’s reComputer RK3576 Kit Runs YOLO11 at 80 FPS for $219
Seeed's new RK3576 dev kit packs a 6 TOPS NPU, a Pi-compatible 40-pin header and an optional 20 TOPS accelerator. Here's whether your build…