This work focuses on computer-based DAQ, where
the instrument is connected to the computer through
the USB bus. It presents a low-cost DAQ that is open to
the users (openDAQ) [13]. It is a powerful tool that allows
configuring, in a short time, many kinds of experiments,
related to instrumentation and measurement systems. The
open source communications protocol and the availability
of low level libraries for handling work environments in
Python and LabVIEW increase its scope.
The paper is organized as follows: Section 2 presents
the general characteristic of the DAQ developed and it is
compared in relationship to other popular device. Section 3
describes the hardware implementation. Section 4 presents
the firmware implementation. Section 5 is devoted
to explain how to use the DAQ. Section 6 shows an example
of application. Finally, Section 7 is for the conclusions.