- First run: If no master UID in EEPROM, the first scanned card becomes MASTER. - After enrollment: Only MASTER unlocks; others are denied. - LCD, LEDs, buzzer give clear feedback. #define LOCK_POS 10 ...

The Smart Trolley System manages trolley items using RFID technology, displays real-time updates on an LCD, and sends SMS notifications with product details and total amounts via a GSM module.

Assume that you are moving towards a complex microcontroller project bundled with blinkers, beepers, and a display panel. To link a standard 16×2 LCD directly with the microcontroller, for instance ...

センサーの挙動（電流変化）によって生じる約64mV（ADCで13カウント）の差。この微小ながらも確実な変化をそのまま利用し、独立したモニターとして機能するシステムへと落とし込みます。 I2C接続LCDの配線とライブラリ導入 センサーの値をPCのシリアル ...

An automatic toll gate system using Arduino revolutionises traditional toll collection by eliminating manual intervention. The “automatic toll gate system project” demonstrates how simple sensors and ...

ラズパイ2台分なのが都合がよかったのでこちらを選択。I2C接続で使用。 販売ページにリファレンスもあるのでそのままで ...

The I2C (Inter-Integrated Circuit) bus is a synchronous serial communication protocol that allows multiple electronic components (sensors, displays, memories, etc.) to be connected within the same ...