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3. Smart Pin Secure Vault is an 8051-based embedded prototype: users enter a 4-digit PIN on a 4×3 keypad, which drives an L293D-controlled motor to lock/unlock a door. Status is shown on a 16×2 LCD, a…

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4. CAN-Based ADC Telemetry and Control System

6. Minimal I²C/SPI drivers for ADXL345 accelerometer on STM32F411 Nucleo. Includes register-level GPIO/I²C/SPI init, burst read/write, and examples converting raw X/Y/Z data to g. Built with STM32Cube…

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