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pm:prj2025:eradu:stefan.dascalu2612 [2025/05/29 23:48] stefan.dascalu2612 |
pm:prj2025:eradu:stefan.dascalu2612 [2025/05/30 07:54] (current) stefan.dascalu2612 |
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| ==== Pin-out Detail ==== | ==== Pin-out Detail ==== | ||
| ^ Component ^ Interface ^ Arduino pin ^ Direction ^ Rationale ^ | ^ Component ^ Interface ^ Arduino pin ^ Direction ^ Rationale ^ | ||
| - | | Keypad row/col | GPIO | D2–D9 | input | Pin-change ISR on D2–D5; columns polled on D6–D9 | | + | | Keypad row/col | GPIO | D2–D9 | input | Scanned periodically by Keypad library (no interrupts) | |
| | Passive buzzer | GPIO | D11 | output | direct drive with tone()/noTone() | | | Passive buzzer | GPIO | D11 | output | direct drive with tone()/noTone() | | ||
| | Red LED | GPIO | D13 | output | Built-in LED pin | | | Red LED | GPIO | D13 | output | Built-in LED pin | | ||
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| === Implementation Status === | === Implementation Status === | ||
| - | * ~200 lines of custom C++ on Arduino Uno integrating all core features | + | * ~400 lines of custom C++ on Arduino Uno integrating all core features |
| * PIN entry with 4×4 matrix scan, three-strike alarm, and time-based lockout fully tested | * PIN entry with 4×4 matrix scan, three-strike alarm, and time-based lockout fully tested | ||
| * Live clock updates, non-blocking unlock/relock, and persistent last-unlock log verified in hardware | * Live clock updates, non-blocking unlock/relock, and persistent last-unlock log verified in hardware | ||
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| ==== Conclusions ==== | ==== Conclusions ==== | ||
| - | eSafe demonstrates integration of GPIO, interrupts, timers, PWM, and I²C into a user-friendly digital safe. Non-blocking design ensures smooth UI and reliable timekeeping. | + | eSafe showcases the seamless integration of three core microcontroller features: PWM (servo latch), ADC (live VCC monitoring), and I²C (RTC + LCD). All time-sensitive tasks are handled with non-blocking `millis()` logic, so the user interface stays responsive while the clock remains accurate. |
| ==== Bibliography & Resources ==== | ==== Bibliography & Resources ==== | ||
| * ATmega328P Datasheet | * ATmega328P Datasheet | ||
