References: Robots and Mobile Systems

1. Robot - Wikipedia - Overview of what makes a machine a robot: sensing, processing, and acting. Sets the context for this chapter's mobile-robot projects.

2. Differential wheeled robot - Wikipedia - Explains how independently driven wheels steer a robot by varying their speeds. Directly supports the chapter's drive-and-turn logic.

3. Mobile robot - Wikipedia - Covers navigation, line following, and obstacle avoidance for moving robots. Reinforces the chapter's autonomous-behavior section.

4. Robot Building for Beginners (3rd Edition) - David Cook - Apress - A friendly, thorough guide to building a working robot from parts, paralleling this chapter's hands-on approach.

5. Making Things Move - Dustyn Roberts - McGraw-Hill - Covers the mechanics of wheels, motors, and chassis that underpin the robots built in this chapter.

6. Maker Pi RP2040 - Cytron - Product page for the integrated robot-control board used in this course, with motor and servo ports built in. Matches the chapter's recommended platform.

7. Motor Selection Guide - Adafruit - Helps choose the right motors and drivers for a mobile robot. Supports the chapter's drivetrain decisions.

8. L298N Motor Driver Tutorial - Last Minute Engineers - Explains the dual H-bridge used to drive two robot wheels with direction and speed control. Reinforces the chapter's motor wiring.

9. Robot Chassis Kits - Pololu - A catalog of differential-drive chassis kits suitable for the robots in this chapter. Useful for sourcing parts for a build.

10. machine.PWM - MicroPython - Reference for controlling wheel-motor speed with PWM. Connects the chapter's navigation logic to working code.