Tutorial 1: ESP8266 with DHT11 Temperature and Humidity Sensor using Arduino IDE---https://microdigisoft.com/esp8266-with-dht11-temperature-and-humidity-sensor-using ...

Let me introduce another simple microcontroller-based do-it-yourself circuit that detects motion and excites a light source in a flash. The “snooper” here is an ordinary passive infrared (PIR) motion ...

[ladyada] has a freshly-published and amazingly thorough tutorial on passive infrared (PIR) motion sensors. Most often seen in security floodlights and automatic doors, in creative hands these sensors ...

This project implements a secure password-based unlocking system using an Arduino Nano, featuring motion detection via a PIR sensor, password input through a 4x4 matrix keypad, and user feedback via a ...