| MovementDetector | High-level movement detection and state tracking using ultrasonic distance sensors like HC-SR04. |
| NextionControl | High-level controller for Nextion HMI displays on Arduino-compatible boards. |
| SensorManager | Modular sensor scheduling with non-blocking, time-based updates for Arduino projects. |
| SerialCommandManager | Parses structured serial commands with key/value parameters and routes them to handlers with debug and error support. |