An advanced IoT-based smart door system using RFID, PIN keypad, and Telegram for secure access and notification. Built on ESP32 and D1 Mini with dual-microcontroller communication ...

We present a unified library for MQ sensors, this library allows to read MQ signals easily from Arduino, Genuino, ESP8266, ESP-32 boards whose references are MQ2, MQ3, MQ4, MQ5, MQ6, MQ7, ... kolandor ...