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--- pm:prj2025:vradulescu:alexandra.ionita03 [2025/05/20 02:11]
alexandra.ionita03 [Jurnal]
+++ pm:prj2025:vradulescu:alexandra.ionita03 [2025/05/23 16:50] (current)
alexandra.ionita03 [Software Design]
@@ Line 134: / Line 134: @@
   * Timekeeping System: multiple timing variables track when different components need updates
+**Project Innovation**
+The novelty of this project lies in the integration of interrupt-driven sensor processing with real-time multi-component coordination. Unlike basic proximity detection systems, this project combines continuous servo scanning with non-blocking alarm systems, creating a dynamic radar-like surveillance system. The use of Timer2 interrupts for sensor reading while maintaining smooth servo operation and responsive LCD updates represents a different approach to embedded system design.
+**Project Architecture and Validation**
+The system follows a modular architecture where the ISR handles time-critical sensor operations while the main loop manages user interface components. Validation was performed through systematic testing:
+  * Distance accuracy: Tested with objects at known distances (5cm, 10cm, 15cm, 20cm) showing ±0.5cm precision
+  * Response time: Verified 1-second detection latency meets system requirements
+  * Scanning consistency: Confirmed smooth 180° servo sweep without stuttering
+  * Component coordination: Verified simultaneous operation of LEDs, buzzer, LCD, and servo without interference
+**Sensor Calibration Process**
+The HC-SR04 ultrasonic sensor calibration involved:
+  * Distance Formula Validation: Verified the 0.034 cm/μs speed of sound constant through measurements against known distances
+  * Threshold Optimization: Through testing various objects and distances, established 15cm as optimal detection threshold balancing sensitivity and false positives
+**Performance Optimizations**
+  * LCD Update Optimization: Implemented 250ms update intervals to eliminate flickering while maintaining responsiveness
+  * ISR Efficiency: Minimized ISR execution time by moving complex operations to main loop using flag-based communication
+  * Timer Configuration: Selected Timer2 to avoid conflicts with Servo library's Timer1 usage
+**The demonstration video showcases** (the video is in the archive)
+  * Initial startup with "Safe area" display and green LEDs
+  * Continuous servo scanning motion (0-180°)
+  * Object detection triggering red LED flashing and buzzer alarm
+  * LCD displaying exact distance measurements
+  * Return to safe mode when object is removed
 ===== Results Obtained =====
@@ Line 144: / Line 173: @@
 ===== Download =====
-<note warning>
+{{:pm:prj2025:vradulescu:radar_guard.zip|}}
-O arhivă (sau mai multe dacă este cazul) cu fişierele obţinute în urma realizării proiectului: surse, scheme, etc. Un fişier README, un ChangeLog, un script de compilare şi copiere automată pe uC crează întotdeauna o impresie bună ;-).
-Fişierele se încarcă pe wiki folosind facilitatea **Add Images or other files**. Namespace-ul în care se încarcă fişierele este de tipul **:pm:prj20??:c?** sau **:pm:prj20??:c?:nume_student** (dacă este cazul). **Exemplu:** Dumitru Alin, 331CC -> **:pm:prj2009:cc:dumitru_alin**.
-</note>
 ===== Journal =====
@@ Line 155: / Line 180: @@
   * [✓] 20/05/2025 - Software Design
-===== Bibliografie/Resurse =====
+===== Bibliography/Resources =====
+**Software Resources**
+  * Arduino IDE - "Arduino Software (IDE)" - https://www.arduino.cc/en/software
+  * LiquidCrystal_I2C Library - https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
+  * Arduino Timer Interrupts - https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/
+  * AVR Libc Reference Manual - https://www.nongnu.org/avr-libc/user-manual/
+  * PM laboratories
+**Hardware Resources**
-<note>
+  * Arduino UNO - https://docs.arduino.cc/hardware/uno-rev3/
-Listă cu documente, datasheet-uri, resurse Internet folosite, eventual grupate pe **Resurse Software** şi **Resurse Hardware**.
+  * HC-SR04 Ultrasonic Sensor Datasheet - https://cdn.sparkfun.com/datasheets/Sensors/Proximity/HCSR04.pdf
-</note>
+  * LCD 1602 I2C Display - https://www.vishay.com/docs/37299/37299.pdf
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