  We introduce an instrument for a wide spectrum of experiments on gravities
other than our planet's. It is based on a large Atwood machine where one of the
loads is a bucket equipped with a single board computer and different sensors.
The computer is able to detect the falling (or rising) and then the
stabilization of the effective gravity and to trigger actuators depending on
the experiment. Gravities within the range 0.4 g to 1.2 g are easily achieved
with acceleration noise of the order of 0.01 g. Under Martian gravity we are
able to perform experiments of approximately 1.5 seconds duration. The system
includes features such as WiFi and a web interface with tools for the setup,
monitor and the data analysis of the experiment. We briefly show a case study
in testing the performance of a model Mars rover wheel in low gravities.
