Sewing machine

A sewing machine comprising:

• a coordinate indicator comprising:
• a cylindrical housing;
• a rod-shaped indicating member including an indicator end, the indicator end being configured to indicate an indicated point, the indicating member being configured to be housed in the housing, the indicating member being configured to be pressed to move along a longitudinal direction of the housing, and the indicating member being configured such that the indicator end protrudes from one end of the housing in the longitudinal direction;
• a switch housed in the housing, the switch being configured to be turned on when the indicating member is pressed;
• a single transmitter housed in the housing, the transmitter being configured to transmit an ultrasonic wave a plurality of times while the switch is on;
• a receiver configured to receive the ultrasonic wave transmitted by the transmitter;
• and
• a flat surface configured to be indicated by the indicator end;
• a processor;
• and
• a memory configured to store computer-readable instructions, wherein the computer-readable instructions, when executed by the processor, cause the sewing machine to perform processes comprising:
• computing a plurality of sets of first coordinates based on a plurality of times at which the receiver receives the ultrasonic wave, the plurality of sets of the first coordinates being coordinates of a plurality of positions, on the flat surface, of the transmitter that transmits the ultrasonic wave;
• computing a movement direction based on at least some of the computed plurality of sets of the first coordinates, the movement direction being a movement direction of the transmitter on the flat surface in which the transmitter is moved along the longitudinal direction while the switch is on;
• computing a movement distance based on at least some of the computed plurality of sets of the first coordinates, the movement distance being a movement distance on the flat surface by which the transmitter is moved along the longitudinal direction while the switch is on;
• and
• computing second coordinates based on at least some of the plurality of sets of the first coordinates, the movement direction, and the movement distance, the second coordinates being coordinates of the indicated point, and the indicated point being a position on the flat surface indicated by the indicator end.