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
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…
esp32 & esp8266
Petoi’s Quaddle Is a Foldable ESP32-S3 Quadruped Robot for $99
Petoi packed omnidirectional walking into four servos and an ESP32-S3, then made the legs fold flat. Here is what the $99 Quaddle can actually…
esp32 & esp8266
Build a $10 ESP32-C3 Fridge Monitor That Logs Its Own Data
A $10 XIAO ESP32C3 and a DHT22 keep 30 minutes of fridge temperature history on-device, cutting network traffic by 92 percent. A tidy weekend…
esp32 & esp8266
This Desktop WALL-E Robot Runs on an ESP32-S3 and Talks Back
Seven servos, two 12V track motors and an ESP32-S3 turn a WALL-E replica into a desk robot that holds a conversation and names what…
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…
diy projects
This ESP32 CHIP-8 Computer Runs on a Flame and a Stirling Engine
No battery, no wall wart. A Stirling engine and a candle push enough current to run an ESP32 CHIP-8 machine with an OLED and…
diy projects
Wireless ESP32 Bike Brakes: ABS From Car Door Lock Actuators
A fat-bike brake with no cable at all: ESP32 nodes talking over ESP-NOW drive car door lock actuators, unlocking ABS and an adjustable bite…
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…
arduino
An Arduino Nano ESP32 Robot Flips All 666 Pixels of This Display
Most flip-disc displays need one solenoid per pixel. This 666-tile panel uses a single Arduino Nano ESP32 gantry robot that prods each tile instead.
diy projects
A XIAO ESP32-S3 Clock Hiding Inside a Fake Linksys WRT Router
Glen Akins rebuilt the mid-2000s Linksys WRT router as an NTP desk clock, swapping a Raspberry Pi Zero 2 W for a 21 mm…
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.