* corresponding author e-mails: camilobasto@gmail.com (C. Basto), luca.pela@upc.edu (L. Pelà), rolando.chacon@upc.edu (R. Chacón). Open-Source Digital Technologies for Low-Cost Monitoring of Historical Constructions Camilo Basto, Luca Pelà*, Rolando Chacón Department of Civil and Environmental Engineering Universitat Politècnica de Catalunya (UPC-BarcelonaTech), Barcelona, Spain Abstract This paper shows new possibilities of using novel, open-source, low-cost platforms for the structural health monitoring of heritage structures. The objective of the study is to present an assessment of increasingly available open-source digital modeling and fabrication technologies in order to identify the suitable counterparts of the typical components of a continuous static monitoring system for a historical construction. The results of the research include a simple case-study, which is presented with low-cost, open-source, calibrated components, as well as an assessment of different alternatives for deploying basic structural health monitoring arrangements. The results of the research show the great potential of these existing technologies that may help to promote a widespread and cost-efficient monitoring of the built cultural heritage. Such scenario may contribute to the onset of commonplace digital records of historical constructions in an open-source, versatile and reliable fashion. Keywords: Structural Health Monitoring; Continuous Monitoring; Digital Fabrication; Digital Society; Do-It-Yourself; Low-Cost. 1. Introduction The set of strategies aimed at identifying damage as well as the overall health conditions in structural systems is known as Structural Health Monitoring (SHM). SHM is an active field of research ranging from high precision aeronautical and automotive industries, the energy sector to, in a broader sense, civil engineering structures [1-5]. Roughly speaking, SHM systems include: i) sensors capable of acquiring a desired physical magnitude, ii) data-acquisition systems capable of storing and/or sending the obtained data and iii) a complex post-processing that involves the analysis of the obtained results. Structural systems of all kinds can be monitored and decisions are taken based upon real observations. Monitoring activities are usually costly since tailor- made installations, heavily-wired deployments and sophisticated post-processing analysis are necessary for obtaining and understanding the health records of those structures. SHM is a non-invasive survey process of paramount importance in the analysis of structures of the built cultural heritage. As a matter of fact, it represents an essential part of the modern integrated knowledge-based methodologies that establish a framework of