This Arduino board is bigger than your head, and it works

A YouTube builder shows off how he created an Arduino board that's 7x larger than the real thing... powered by a hidden ...
GitHub

Serial Port Communication tutorial using Java and Arduino (ATmega328P)

In this tutorial we will learn how to program serial port of a windows PC using Java programming language. The PC will communicate with an Arduino connected to the USB virtual Serial port of the PC ...
GitHub

Arduino Library for PCF8574, a 8-port GPIO exander via i2c

or located under the following github pages github.io. Additionally in combination with the technical datasheet of microchip PCF8574-Datasheet. PCF8574_I2C::PCF8574 pcf{0x20, &Wire}; void setup() { ...