A practical guide to wiring the 28BYJ-48 stepper motor with its ULN2003 driver and precisely controlling its direction and speed.
Build a simple calculator with a 4x4 keypad and an LCD screen that performs addition, subtraction, multiplication, and division.
Build a standalone digital LCD voltmeter that measures voltages up to about 55V using a simple voltage divider.
Smoothly control a DC motor's speed via PWM, a transistor, and a potentiometer as a manual control interface.