Spraying system, methods of making and using the same, and computer-readable medium for controlling the same

A sprayer system, comprising:

• a) a wand having a nozzle at a first end thereof;
• b) a rotary arm configured to rotate around a first axle, wherein the rotary arm has a first end connected to a second end of the wand through a rotating or rotatable connection mechanism, and the second end of the wand is opposite from the first end of the wand;
• c) a motor configured to drive rotation of the rotary arm;
• d) a support, configured to mechanically support the motor and/or the rotary arm;
• and
• e) a controller or control panel configured to control the rotation of the rotary arm;
• wherein:
• the wand and the rotary arm are configured so that the rotation of the rotary arm causes the nozzle to move in a circular, elliptical and/or oval pattern;
• the wand comprises a hollow tube, and the system further comprises a tank configured to store a liquid, a hose configured to supply the liquid from the tank to the wand, and a valve along the hose configured to open and close in response to a valve control signal from the controller or control panel;
• and
• the valve control signal keeps the valve closed when the rotary arm and the wand are at an angle between 0° and 90° and between 270° and 360°, and the valve control signal can open the valve only when the angle between the rotary arm and the wand is from 90° to 270°, wherein 0° is a position in which the rotary arm and the wand overlap and/or the nozzle is retracted from the parlor to its maximum extent.