Tamper detection in a stationary credential reader device

An access control system, comprising:

• a peripheral controller configured to control access through a passageway;
• and
• a wall-mounted credential reader device adapted to be secured to a wall of a building, the wall-mounted credential reader device comprising:
• a credential reader electrically coupled to the peripheral controller and adapted to receive credential data from credential devices presented to the wall-mounted credential reader device;
• an inertial sensor that generates sensor data indicative of an acceleration of the wall-mounted credential reader device;
• a processor;
• and
• a memory comprising a plurality of instructions stored thereon that, in response to execution by the processor, causes the wall-mounted credential reader device to:
• receive sensor data generated by the inertial sensor;
• compare the received sensor data to reference data indicative of an acceleration of the wall-mounted credential reader device when the wall-mounted credential reader device is not moving;
• and
• generate a tamper alert in response to the comparison indicating that a deviation of the received sensor data from the reference data exceeds a threshold, wherein to compare the received sensor data to the reference data comprises to reduce signal noise associated with movement of the building from the received sensor data.