{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:25:38Z","timestamp":1760243138763,"version":"build-2065373602"},"reference-count":18,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2015,10,27]],"date-time":"2015-10-27T00:00:00Z","timestamp":1445904000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Spanish Ministry of Economy and Competitiveness","award":["DPI2011-22513","DPI2014-56364-C2-1-R"],"award-info":[{"award-number":["DPI2011-22513","DPI2014-56364-C2-1-R"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Most experimental fields of science and engineering require the use of data acquisition systems (DAQ), devices in charge of sampling and converting electrical signals into digital data and, typically, performing all of the required signal preconditioning. Since commercial DAQ systems are normally focused on specific types of sensors and actuators, systems engineers may need to employ mutually-incompatible hardware from different manufacturers in applications demanding heterogeneous inputs and outputs, such as small-signal analog inputs, differential quadrature rotatory encoders or variable current outputs. A common undesirable side effect of heterogeneous DAQ hardware is the lack of an accurate synchronization between samples captured by each device. To solve such a problem with low-cost hardware, we present a novel modular DAQ architecture comprising a base board and a set of interchangeable modules. Our main design goal is the ability to sample all sources at predictable, fixed sampling frequencies, with a reduced synchronization mismatch (&lt;1 \u00b5s) between heterogeneous signal sources. We present experiments in the field of mechanical engineering, illustrating vibration spectrum analyses from piezoelectric accelerometers and, as a novelty in these kinds of experiments, the spectrum of quadrature encoder signals. Part of the design and software will be publicly released online.<\/jats:p>","DOI":"10.3390\/s151027374","type":"journal-article","created":{"date-parts":[[2015,10,27]],"date-time":"2015-10-27T17:23:21Z","timestamp":1445966601000},"page":"27374-27392","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["A Low-Cost Modular Platform for Heterogeneous Data Acquisition with Accurate Interchannel Synchronization"],"prefix":"10.3390","volume":"15","author":[{"given":"Jos\u00e9","family":"Blanco-Claraco","sequence":"first","affiliation":[{"name":"Engineering Department, University of Almer\u00eda, Ctra. de Sacramento s\/n, La Ca\u00f1ada 04120, Spain"}]},{"given":"Javier","family":"L\u00f3pez-Mart\u00ednez","sequence":"additional","affiliation":[{"name":"Engineering Department, University of Almer\u00eda, Ctra. de Sacramento s\/n, La Ca\u00f1ada 04120, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0147-9231","authenticated-orcid":false,"given":"Jos\u00e9","family":"Torres-Moreno","sequence":"additional","affiliation":[{"name":"Engineering Department, University of Almer\u00eda, Ctra. de Sacramento s\/n, La Ca\u00f1ada 04120, Spain"}]},{"given":"Antonio","family":"Gim\u00e9nez-Fern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Engineering Department, University of Almer\u00eda, Ctra. de Sacramento s\/n, La Ca\u00f1ada 04120, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2015,10,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"265","DOI":"10.1016\/j.measurement.2014.05.010","article-title":"Low-cost open-source multifunction data acquisition system for accurate measurements","volume":"55","author":"Llopis","year":"2014","journal-title":"Measurement"},{"key":"ref_2","unstructured":"PXI Bus Especifications. Available online: http:\/\/www.ni.com\/pxi\/."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"836","DOI":"10.1016\/j.ymssp.2004.06.007","article-title":"Gear fatigue crack prognosis using embedded model, gear dynamic model and fracture mechanics","volume":"19","author":"Li","year":"2005","journal-title":"Mecha. Syst. Signal Process."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"194","DOI":"10.1016\/j.gaitpost.2006.09.012","article-title":"Evaluation of a threshold-based tri-axial accelerometer fall detection algorithm","volume":"26","author":"Bourke","year":"2007","journal-title":"Gait Posture"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"9755","DOI":"10.3390\/s140609755","article-title":"A Flexible Microcontroller-Based Data Acquisition Device","volume":"14","author":"Hercog","year":"2014","journal-title":"Sensors"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"614","DOI":"10.1016\/j.proeng.2012.01.1317","article-title":"Design and implementation of a low cost DAQ system for thermoelectric property measurements","volume":"32","author":"Sumphao","year":"2012","journal-title":"Proced. Eng."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Peuhkuri, M., Gr\u00f6hn, A., and Simola, O. (2007, January 21\u201323). Clock synchronisation in industry-standard computer hardware. Proceedings of the 3rd International Conference on Testbeds and Research Infrastructure for the Development of Networks and Communities (TridentCom 2007), Lake Buena Vista, FL, USA.","DOI":"10.1109\/TRIDENTCOM.2007.4444668"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1177\/0278364913507326","article-title":"The M\u00e1laga Urban Dataset: High-rate Stereo and Lidars in a realistic urban scenario","volume":"33","author":"Blanco","year":"2014","journal-title":"Int. J. Robot. Res."},{"key":"ref_9","unstructured":"Mechitov, K., Kim, W., Agha, G., and Nagayama, T. (2004, January 22\u201323). High-frequency distributed sensing for structure monitoring. Proceedings of the First International Workshop on Networked Sensing Systems (INSS\u201904), Tokyo, Japan."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Maroti, M., Kusy, B., Simon, G., and Ledeczi, A. (2004, January 3\u20135). The flooding time synchronization protocol. Proceedings of the 2nd International Conference on Embedded Networked Sensor Systems, Baltimore, MD, USA.","DOI":"10.1145\/1031495.1031501"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"439","DOI":"10.12989\/sss.2010.6.5_6.439","article-title":"Structural health monitoring of a cable-stayed bridge using smart sensor technology: Deployment and evaluation","volume":"6","author":"Jang","year":"2010","journal-title":"Smart Struct. Syst."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"150","DOI":"10.1016\/j.nima.2014.05.126","article-title":"Multi-channel data acquisition system with absolute time synchronization","volume":"763","author":"Pustelny","year":"2014","journal-title":"Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrom. Detect. Assoc. Equip."},{"key":"ref_13","unstructured":"LibreDAQ Open Source Repository. Available online: https:\/\/github.com\/LibreDAQ."},{"key":"ref_14","unstructured":"Atmel Software Framework (ASF) Reference. Available online: http:\/\/www.atmel.com\/tools\/avrsoftwareframework.aspx."},{"key":"ref_15","unstructured":"Torres, J.L., Blanco, J.L., Sanjurjo, E., Gim\u00e9nez-Fern\u00e1ndez, A., and Naya, M.\u00c1. (July, January 29). A testbed for benchmarking state observers in Multibody Dynamics. Proceedings of the ECCOMAS Thematic Conference on Multibody Dynamics, Barcelona, Spain."},{"key":"ref_16","unstructured":"Sanjurjo, E., Blanco, J.L., Torres, J.L., and Naya, M.\u00c1. (July, January 29). Testing the efficiency and accuracy of multibody-based state observers. Proceedings of the ECCOMAS Thematic Conference on Multibody Dynamics, Barcelona, Spain."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"103","DOI":"10.1007\/s11044-014-9440-9","article-title":"Multibody dynamic systems as Bayesian networks: Applications to robust state estimation of mechanisms","volume":"34","year":"2015","journal-title":"Multibody Syst. Dyn."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.mechmachtheory.2015.04.018","article-title":"Design and analysis of a flexible linkage for robot safe operation in collaborative scenarios","volume":"92","author":"Blanco","year":"2015","journal-title":"Mech. Mach. Theor."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/15\/10\/27374\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T20:50:57Z","timestamp":1760215857000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/15\/10\/27374"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2015,10,27]]},"references-count":18,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2015,10]]}},"alternative-id":["s151027374"],"URL":"https:\/\/doi.org\/10.3390\/s151027374","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2015,10,27]]}}}