This work shows the implementation of two physics laboratory experiences, assisted by PC through commercial low-cost and data collection control cards. One ArduinoTM card is used to measure obscuration times between different photogates located in the path of an object. Recording time allows to calculate the average and instantaneous speed in different photogates positions. The first experience is related to the alternative method suggested by Galileo to measure the acceleration of gravity, comparing the speed with the square of the elapsed time. additionally, we can measure the kinetic friction coefficient value known gravity. The second experience is related with measuring the viscosity of a liquid when a metal ball falls through it. The average speed and the snapshot in the different positions of the photo doors are calculated, this speed is adjusted according to the position to be able to calculate the limit speed, transforming the experience into one of rectilinear uniform movement and also, for that condition, with the value of the speed viscosity can be calculated.