A practical MFRC522 and Arduino access-control prototype with correct wiring, power separation and a safe path from LEDs to a real lock actuator.
Start reliable ESP32 servo control with an external 5 V supply, board-specific GPIO selection, pulse calibration, and mechanical safety.
Understand NEO-6M channels, nominal accuracy, 5 Hz updates, four-satellite 3D fixes, board-specific power, antennas, and UART data.
Explaining how the three-axis MEMS-based ADXL335 sensor works and wiring it to Arduino's analog pins to measure tilt and acceleration.