iot & smart home
Raspberry Pi Runs Home Assistant to Track Its Own Net Zero Goal
Raspberry Pi clamped sensors on every breaker and ran Home Assistant on Pi 4 and Pi 5 to cut energy use. Here is how…
esp32 & esp8266
LocalDot: Give an Echo Dot a Local Home Assistant Brain
AAElectronics' LocalDot swaps an Echo Dot's mainboard for an ESP32-P4 and ESP32-S3 that talk only to Home Assistant. Here's how it works and how…
esp32 & esp8266
Hide an ESP32-C3 IR Blaster Inside a Walnut for Smart Home Control
A maker hid an ESP32-C3 inside a walnut shell to beam IR commands at gear that never got a Wi-Fi upgrade. Here is how…
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.
esp32 & esp8266
Off-Grid LoRa Message Board Pairs ESP32-S3 with E-Ink Display
A battery-powered desk display that receives text messages over a LoRa mesh network with no WiFi needed, plus a built-in CO2 and humidity sensor.
iot & smart home
Nordic nRF54LC10A: One Chip for BLE, Thread, Zigbee and Matter
Nordic's nRF54LC10A puts BLE, Thread, Zigbee and Matter on one low-cost chip. Here is what you need to start building with it before kits…
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…
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…
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…
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…
esp32 & esp8266
ESPHome Firmware Cuts the Litter-Robot 4 Free From the Cloud
A PIC runs the motors, an ESP32 just bridges Wi-Fi to UART. Reflash that ESP32 with ESPHome and the litter box answers to Home…
iot & smart home
Upline Puts an ATtiny85 Online Using 4,060 Bytes of Flash
Upline is an open source serial protocol that gets an ATtiny85 or Arduino UNO on the web through a USB cable, using 4,060 bytes…