Analog and PWM signals
Use a potentiometer to control an indicator, and learn how analog measurements differ from PWM outputs.
Analog and Digital
Articles relating to analog and digital electronics, often juxtaposed.
3 tutorials
Using an analog joystick module
Read a thumb stick, calibrate its resting center, and add a dead zone for stable controls.
Using an RFID module
Read an RC522 tag identifier with correct voltage translation, and understand why a UID is not a secure key.