A method of operating a controller includes: obtaining calibration data for a mounting orientation of the controller operating in a calibration mode based on obtaining first acceleration samples from an acceleration sensor; obtaining second acceleration samples from the acceleration sensor when a control switch is activated with the controller operating in a normal operating mode; performing a comparison of the second acceleration samples to the calibration data; based on the comparison, determining whether more than one of the second acceleration samples is not within a specified range; and in response to determining that more than one of the second acceleration samples is not within the specified range, causing the controller to operate in an anti-tamper mode.