Wiring the L298N module to control a bipolar stepper motor like the NEMA 17, and comparing it to the L293D chip.
Wiring the L293D chip to control a DC motor's direction and speed via direction logic and pulse-width modulation.
Wiring the L293D chip to control a stepper motor via four direction pins and the Stepper library, with the difference between unipolar and bipolar motors.
An explanation of two ways to read multiple DS18B20 sensors on the same data line with Arduino: by sequential index or by each sensor's unique address.