diy projects
Negotiator II: A Business-Card USB-C PD Bench Power Supply
Negotiator II turns any USB-C PD charger into an adjustable 5 V to 48 V bench supply on a 2 mm thick card. Here…
diy projects
Long-Range Bluetooth LE Mesh on an STM32WB07 Module
An STM32WB07 board with Coded PHY and a 20 dBm amplifier pushes Bluetooth LE to 4.6 km line of sight. Here is how to…
diy projects
ESP32-S3 AM Transmitter Revives Old Tube Radios
AM stations are going dark, but an ESP32-S3 can feed internet radio to old tube sets by shaping a carrier on one GPIO pin…
diy projects
SmallTV Hack Shows Any Data on a Cheap ESP Display
A GeekMagic SmallTV can show live data from your PC with no soldering and no new firmware. Just push a 240x240 image over HTTP…
diy projects
UNIHIKER K10 Package Measurer: ToF Sensor Plus Scale
A UNIHIKER K10, an 8x8 ToF matrix, and an HX711 scale team up to measure a parcel's weight and size, then pull up shipping…
diy projects
Two ESP32s Talk Over Light Using Just One LED Each
SecurePair lets two ESP32 boards pair and swap encryption keys over visible light, with one LED per board doing double duty as sender and…
diy projects
H8 Mini: Build a Palm-Sized 8085 Heathkit Replica
The H8 Mini is a through-hole, 80C85-powered replica of the 1977 Heathkit H8, small enough for your palm and simple enough to solder in…
arduino
CantaStorie: Offline AI Storytelling Toy on Arduino UNO Q
CantaStorie runs YOLOX-Nano and Gemma 1B on an Arduino UNO Q to spot an object and narrate a custom story, with zero cloud and…
diy projects
DIY STM32 Scientific Calculator With a Memory LCD and CR2032 Power
An STM32L431, a 400x240 Memory LCD and two CR2032 cells make a graphing RPN calculator. See the power, keypad and PCB tricks you can…
diy projects
200 A Boost Converter: Six-Phase 12 V to 48 V DIY Build
Nick Electronics built a six-phase 200 A boost converter that turns 12 V into 48 V, using aluminum-core PCBs, copper bus bars, and an…
diy projects
Walnut-Shell IR Remote Built on a XIAO ESP32-C3 and Wi-Fi
A real walnut now hides a Wi-Fi infrared remote on a XIAO ESP32-C3, with four IR LEDs, a MOSFET driver and a 6-day battery.…
diy projects
DIY Brain-Computer Interface: 8-Channel EEG on an ESP32
An ESP32, an ADS1299 ADC, and a custom 4-layer PCB make an 8-channel EEG headset under $350. Here is how to scale it down…