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Open data acquisition systems design for academic or NGO applications

Systems with open hardware and software for embedded systems in NGO, academic or research projects, especially those oriented to production or resource measurements in renewable energy conversion (wind an PV) low power equipment.

 

Using similar hardware as the turnkey systems, the design and construction of data acquisition systems for community, research or academic projects is offered, using open licenses and based on configurations similar to those shown in Figure 1.1 which uses SD memory storage and possibility of voltage, current and/or power measurements, as well as an optional ambient measurement METEO module for wind, temperature and barometric pressure.

 

Figure 1.1 –Generic L&R Ingeniería data acquisition system
Figure 1.1 –Generic L&R Ingeniería data acquisition system

 

Based on this hardware, an OpenDLogger generic application in C language is offered, which can be modified in C (base compiler is Codevision AVR 3, by HP Infotech, but can be ported to other compilers). Example system is based on renewable energy systems, and can include additional analog channels both in 13- or 10- bit resolution. A guide for evaluation of uncertainties is also offered.

 

For the M4/E expansion module (Figure 1.2) an example program written in C is offered, using the freely available PSoC Designer software (www.cypress.com) is offered to control up to 13 discrete inputs (LED indicated, not optocoupled), two dry/contact relay outputs and 3 TTL/level outputs, one of which can be configured to activate an on-board buzzer.

 

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Figure 1.2 – Logic diagram of M4/E Module from L&R Ingeniería and typical assembly of board on a finished panel.
Figure 1.2 – Logic diagram of M4/E Module from L&R Ingeniería and typical assembly of board on a finished panel.

 

An example of this kind of system is the one shown in Figure 1.3, for monitoring a low power PV array (SISMED-FV), at AEA / UNPA (Universidad Nacional de la Patagonia Austral) in Rio Gallegos, Santa Cruz. The system is based on the CL2bm1 (CPU), and M4/E (auxiliary inputs) boards, plus low-current ACS71x Hall-effect sensors (Figure 1.4). The front panel construction is shown in Figure 1.5. The program has been modified by the Alternative Energy group to suit the sensing of adjustable angle panels ( 4 x 20 W, on a 24 V system ).

 

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Figure 1.3 – SISMED/FV main panel with batteries (top) and view of roof-mounted PV panels monitored by SISMED-FV at UNPA (bottom)
Figure 1.3 – SISMED/FV main panel with batteries (top) and view of roof-mounted PV panels monitored by SISMED-FV at UNPA (bottom)

 

Figure 1.4 – Hall-effect 5A sensors for PV panels at UNPA, SISMED-FV
Figure 1.4 – Hall-effect 5A sensors for PV panels at UNPA, SISMED-FV

 

Figure 1.5 – Front panel of the SISMED/FV (UNPA)
Figure 1.5 – Front panel of the SISMED/FV (UNPA)
Río Gallegos, Santa Cruz - República Argentina