This code is for an RFID door lock system using an Arduino. It reads the UID of the RFID card and compares it to a predefined ...

The plan was to use the always-on 5V standby rail to drive a pair of relays. One relay senses the computer’s on/off switch and triggers the ATX power supply to turn on. The problem is the ...

For simplicity, I opt for a relay module with an external power source. For the power supply, we can use either an external 12V adapter for powering Arduino through a DC jack or we can also provide a ...

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Based on translation capability, LLTs are categorized into three primary types: bidirectional, high-to-low, and low-to-high.