The LM78XX series of voltage regulators are commonly used in various electronics applia

The PIR sensor stands for Passive Infrared sensor.

The Arduino Nano is another popular Arduino development board very much similar to the

The HC-05 is a popular bluetooth module which can add two-way (full-duplex) wireless functionality to your projects

The DHT11 is a commonly used Temperature and humidity sensor that comes with a dedicated NTC to me

74HC573 IC Features and Specifications 

Here are