The first version was built during the fellowship in 2016. It works as intended but is flimsy and difficult to reproduce as it directly connects all parts by wires without a central PCB.  
  Part of: Keller O, Appelhoff S, Paffhausen BH, Wenzel T (2023) Development and Sharing of Open Science Hardware: Lessons Learned from Wikimedia Fellowships. Research Ideas and Outcomes 9: e95174.