An explanation of the four ways to power an Arduino board — via USB, a power adapter, the VIN pin, or the direct 5V pin — with an important safety note.
A tour of electronic tools that help elderly people stay independent at home, and how some of their functions can be rebuilt as simple Arduino projects.
A comparison of UART, I2C, and SPI protocols by wire count, speed, and number of supported devices, with a guide to picking the right one for your project.
Use a ready-made phone voice-recognition app with an HC-06 Bluetooth module to turn LEDs on and off with simple voice commands.