A comparison of DC, servo, and stepper motors by how each works and which is best suited to which use case.
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 comparison of WiFi, Bluetooth, ZigBee, GSM, and RF by range, speed, and power consumption, to help you pick the right wireless method.
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.