In certain projects, it might not be practical to include push-buttons for inputs. The constraints might be spatial or related to parts cost. In these cases, a capacitive touch sensor IC can turn an exposed PCB surface into a push-button that is activated upon touch.
5V/800mA SMPS is an easy-to-use module, which uses minimal components to convert a 220V AC input to a 5V DC output. The module has an output current rating of 800mA. It is widely used in mobile chargers, audio/video players, and more.
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.
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.