What is the difference between VCC and AVCC pins, and for what are they used for in a ATmega328P chip (in an Arduino board)? - Quora
Arduino Projects - Circuit Construction First make the circuit connection as shown in fig1.1. The 1st Pin(Vcc) of Bluetooth(HC05) is connect to +5v of Arduino Uno and 10th pin(GND) to Arduino Uno
![Increase Digital Pins of Your Arduino Using the 74HC595 (IOExtension Module With Arduino Library) : 5 Steps - Instructables Increase Digital Pins of Your Arduino Using the 74HC595 (IOExtension Module With Arduino Library) : 5 Steps - Instructables](https://img.youtube.com/vi/D6QP24AsXDQ/hqdefault.jpg)
Increase Digital Pins of Your Arduino Using the 74HC595 (IOExtension Module With Arduino Library) : 5 Steps - Instructables
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