Abstract: A method for determining a temperature of a fluid of a pool, the method may include: measuring at least one pool cleaning robot (PCR) parameter in relation to a period of time and by one or more PCR sensors located within an interior of the PCR; calculating at least one period of time PCR parameter; determining at least one value of at least one PCR parameter weight based on at least one value of the at least one period of time PCR parameter; and determining the temperature of the fluid of the pool based on the at least one period of time PCR parameter and the at least one PCR parameter weight.

Abstract: A method of evaluating slipperiness of a floor surface of a water pool by inducing one or more rotation scans of a pool equipment unit by driving a power pulse to one or more electric motors configured to rotate the pool equipment unit deployed on a floor surface of a water pool and at least partially submerged in water of the water pool, accumulating power values of the power pulse while its level is above a motor operation threshold, accumulating values of angular velocity of the pool equipment unit measured starting after the power pulse drops below the threshold until the pool equipment unit stops rotating; computing work energy invested to rotate the pool equipment unit based on the power values and the angular velocity values; computing a slipperiness index of the floor surface based on the work energy; and initiating one or more actions according to the slipperiness index.

Abstract: A method for navigating a movable pool related platform (PRP), the method includes moving the movable PRP along a home direction, wherein the movable PRP is associated with a gyroscope and with a magnetometer, wherein the moving is based on a gyroscope-based direction of movement estimate, wherein the gyroscope was aligned with the magnetometer. The magnetometer was calibrated during a calibration process that includes (i) determining, by a controller of the movable PRP, a mapping between magnetometer readings and a magnetometer-based direction of movement estimate; wherein the mapping is based, at least in part, on a first range of the first axis magnetometer readings and a second range of the second axis magnetometer readings; and (ii) performing an alignment iteration that comprises aligning, by the controller, between the magnetometer-based direction of movement estimate and the gyroscope-based direction of movement estimate.

Abstract: Disclosed herein are systems and methods for estimating water turbidity using image data, comprising analyzing a plurality of images of one or more objects submerged in water captured under water from a plurality of distances, calculating a luma value for each of a plurality of pixels along one or more gradient lines across the object(s) in each of the plurality of images, calculating, for each image, a respective maximal intensity change between a lowest luma value and a highest luma value of the pixels along the gradient line(s) in the respective image, evaluating a turbidity of the water based on mapping of the respective maximal intensity change to each of the plurality of distances, and initiating one or more actions in case the turbidity exceeds a certain threshold.

Abstract: A pool cleaning robot that may include a hollow body, a fluid input, a fluid output, a propulsion unit for moving the pool cleaning robot within a pool, a filtering unit, and a sensing module that comprises a gas pressure sensor, a first space, a second space and a diaphragm; wherein the diaphragm seals the second space and separates the first space from the second space; wherein the diaphragm, via the first space, is fluidly coupled to the filtering unit; wherein the diaphragm is configured to define a gas pressure within the second space as a function of, at least, a fluid pressure within the first space; wherein the gas pressure sensor is located within the second space and is configured to measure the gas pressure within the second space.

Abstract: A pool cleaning robot that may include a hollow body, a fluid input, a fluid output, a propulsion unit for moving the pool cleaning robot within a pool, a filtering unit, and a sensing module that comprises a gas pressure sensor, a first space, a second space and a diaphragm; wherein the diaphragm seals the second space and separates the first space from the second space; wherein the diaphragm, via the first space, is fluidly coupled to the filtering unit; wherein the diaphragm is configured to define a gas pressure within the second space as a function of, at least, a fluid pressure within the first space; wherein the gas pressure sensor is located within the second space and is configured to measure the gas pressure within the second space.