  The energy available in Micro Grid (MG) that is powered by solar energy is
tightly related to the weather conditions in the moment of generation. Very
short-term forecast of solar irradiance provides the MG with the capability of
automatically controlling the dispatch of energy. We propose to achieve this
using a data acquisition systems (DAQ) that simultaneously records sky imaging
and Global Solar Irradiance (GSI) measurements, with the objective of
extracting features from clouds and use them to forecast the power produced by
a Photovoltaic (PV) system. The DAQ system is nicknamed as the \emph{Girasol
Machine} (Girasol means Sunflower in Spanish). The sky imaging system consists
of a longwave infrared (IR) camera and a visible (VI) light camera with a
fisheye lens attached to it. The cameras are installed inside a weatherproof
enclosure that it is mounted on an outdoor tracker. The tracker updates its pan
an tilt every second using a solar position algorithm to maintain the Sun in
the center of the IR and VI images. A pyranometer is situated on a horizontal
support next to the DAQ system to measure GSI. The dataset, composed of IR
images, VI images, GSI measurements, and the Sun's positions, has been tagged
with timestamps.
