Abstract: A sprayer has: a reservoir for containing a liquid to be sprayed; a compressor fluidly connected to the reservoir; a pressure sensor operatively connected to one or more of the compressor and the reservoir; and a controller operatively connected to the compressor and the pressure sensor, the controller comprising a processing unit and a computer-readable medium having instructions stored thereon executable by the processing unit for: receiving a signal from the pressure sensor, the signal indicative of a pressure inside the reservoir; comparing the pressure inside the reservoir to a first threshold; and when the pressure inside the reservoir is below the first threshold, actuating the compressor for pressurizing the reservoir until the pressure inside the reservoir reaches the first threshold.