Auto-calibration systems for coin counting devices

A coin counting machine comprising:

• a coin sensor
• a test object movable from a first position spaced apart from the coin sensor to a second position proximate the coin sensor;
• and
• means for automatically moving the test object from the first position to the second position to calibrate the coin sensor.

A method for calibrating a coin sensor, the method comprising:

• automatically moving at least one calibration object from a first position to a second position, wherein moving the at least one calibration object from the first position to the second position includes moving the at least one calibration object toward the coin sensor;
• measuring an electronic output of the coin sensor in response to the calibration object being moved to the second position;
• and
• automatically moving the at least one calibration object from the second position back to the first position.