Arduino DC Motor Code

I have an Arduino-based setup that drives DC motors and I need clean, well-commented code that handles speed control, direction changes, and automated stopping. The sketch can be written from scratch or built on what I already have; either way, I want the final file to compile error-free in the current Arduino IDE and be easy for me to tweak later. Here’s the core logic I’m after: • Speed control – PWM or another reliable method that lets me adjust RPM smoothly from zero to full throttle. • Direction control – forward/reverse switching triggered by a digital input or a serial command. • Automated stopping – when a limit switch, sensor, or timed event is triggered the motor should brake or coast to a halt, then wait for the next command. If a standard H-bridge driver library (e.g., built-in PWM pins, L298N, DRV8871, etc.) makes things simpler, feel free to use it; just note it clearly in the comments so I know what hardware you assumed. Please structure the code so pin assignments, speed limits, and debounce times sit in a single block of #defines or constants for quick edits. Before delivery, confirm the logic on your end—Serial Monitor printouts for each state change are enough. Hand over the .ino file, any custom libraries, and a short read-me explaining setup and test steps.