microcontrollers
SPIDriver Quattro: A USB SPI Debugger With a Built-In Screen
Debugging SPI blind is painful. The SPIDriver Quattro adds a live display, 0.1 mA current sensing, and quad-SPI support so you can see what…
raspberry pi
Pinetek IOL Core4: Add IO-Link Sensors to a Raspberry Pi HAT
A Raspberry Pi HAT with four IO-Link ports turns factory-grade sensors into a weekend project. Here is what the IOL Core4 kit includes and…
diy projects
CircuitPython POV Bike Wheel: Floating Images on 6 LED Strips
Six DotStar strips, a Feather RP2040, and a magnet sensor make a bike wheel draw images in mid-air. See how the timing trick works…
diy projects
AIR PRO: Pip-Boy Air Quality Monitor on Qualia S3 + SEN66
A wooden Pip-Boy box reads CO2, PM, VOC and NOx every 2 seconds and shows one word for air quality. See how the Qualia…
iot & smart home
IronEar’s ESP32-S3 Sensor Hears 500 Sounds, Skips the Camera
An open-source ESP32-S3 sensor node classifies 500+ household sounds on-device and reports to Home Assistant over MQTT or a private LoRa mesh.
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…
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.
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.
robotics
Bird-Inspired Drone Perches Using 9 Touch Sensors, No Camera
TU Delft's drone finds a branch with nine one-bit touch sensors instead of a camera, hitting a 99% perch rate even when its position…
esp32 & esp8266
Build a Palm-Vein Biometric Door Lock with an ESP32 and IR Camera
An ESP32, a DFRobot dual-camera module and 940nm infrared light read the veins under your palm. Here is the parts list and the wiring…
news & releases
Banana Pi’s BPI-AI2N Packs 15 TOPS of Vision AI Into a Module
Banana Pi's BPI-AI2N runs vision models on-device: a Renesas RZ/V2N module with 15 TOPS, 8 GB of RAM, dual GbE and two MIPI CSI…
iot & smart home
WeatherXM D2 Mesh: A Solar LoRa Weather Station With No Wi-Fi
A solar weather station that reports over a LoRa mesh instead of Wi-Fi or cellular, plus how to build a cheap ESP32 version of…