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In this work, an alternative to commercially available monitoring systems used in the industry was developed and tested in the scope of the TOOLING 4G project. The novelty of this system is its affordability, simplicity, real-time data acquisition and display in an intuitive Graphical User Interface (GUI), while being open-source firmware and software-based. These characteristics, and their combinations have been present in previous works, but, to the authors\u2019 knowledge, not all of them simultaneously. The system used an Arduino microcontroller-based data acquisition module that can be connected to any computer via a USB port. Software was developed, including a GUI, prepared to receive data from both the Arduino module and a second module. In the current state of development, data corresponding to a maximum of six sensors can be visualized, at a rate of 10 Hz, and recorded for later usage. These capabilities were verified under real-world conditions for monitoring an injection mold with the objective of creating the basis of a platform to deploy predictive maintenance. Mold temperature, cavity pressure, 3-axis acceleration, and extraction force data showed the system can successfully monitor the mold and allowed the clear distinction between normal and abnormal operating patterns.<\/jats:p>","DOI":"10.3390\/s23073569","type":"journal-article","created":{"date-parts":[[2023,3,30]],"date-time":"2023-03-30T01:31:30Z","timestamp":1680139890000},"page":"3569","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Development of an Open-Source Injection Mold Monitoring System"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9134-2238","authenticated-orcid":false,"given":"Tiago E. 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F.","family":"Ferreira","sequence":"additional","affiliation":[{"name":"TEMA\u2014Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"given":"Renato","family":"Febra","sequence":"additional","affiliation":[{"name":"Geco\u2014Gabinete T\u00e9cnico e Controlo de Moldes em Fabrica\u00e7\u00e3o Lda, 2405-032 Maceira, Portugal"}]},{"given":"Jo\u00e3o","family":"Silva","sequence":"additional","affiliation":[{"name":"CeNTI\u2014Centro de Nanotecnologia e Materiais T\u00e9cnicos, Funcionais e Inteligentes, 4760-034 Vila Nova de Famalic\u00e3o, Portugal"}]},{"given":"Tiago","family":"Noversa","sequence":"additional","affiliation":[{"name":"IPC\u2014Institute for Polymers and Composites, Universidade do Minho, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8964-400X","authenticated-orcid":false,"given":"Ant\u00f3nio J.","family":"Pontes","sequence":"additional","affiliation":[{"name":"IPC\u2014Institute for Polymers and Composites, Universidade do Minho, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1198-4220","authenticated-orcid":false,"given":"Victor","family":"Neto","sequence":"additional","affiliation":[{"name":"TEMA\u2014Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Ageyeva, T., Horv\u00e1th, S., and Kov\u00e1cs, J.G. 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