This project is an ESP32-based RFID access verification system that uses an ultrasonic sensor, an RC522 RFID reader, a push button, and status LEDs to control a simple verification workflow. The ...
buffer[i*2+0] = nib1 < 0xA ? '0' + nib1 : 'A' + nib1 - 0xA; buffer[i*2+1] = nib2 < 0xA ? '0' + nib2 : 'A' + nib2 - 0xA; buffer[len*2] = '\0'; ...
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