modules
The 5V 700mA isolated switch power supply module is an AC-DC Step-Down converter.
18650 Lithium Battery Protection Board
The Lithium battery protection board is a small size board that provides protection against short-circuit, overcharge and overdischarge. The board comes with pre-soldered Nickel strips which makes it a ready-to-use module with 18650 cells.
I2C Serial Interface Adapter Module for LCD
Due to limited pin resources in a microcontroller/microprocessor, controlling an LCD panel could be tedious. Serial to Parallel adapters such as the I2C serial interface adapter module with PCF8574 chip makes the work easy with just two pins.
Dog Barking Sound Module
Dog Barking Sound Module is a good quality sound output module with contact points for triggering the dog sound to the speakers.