ID	Constraints	Motivation
OC1	Affordable	The cost to assemble a WordClock should be low.
OC2	Documentation	Use arc42 as documentation template.
OC3	Language	Use English for documentation.

ID	Constraints	Motivation
TC1	Open-source	Privilege open-source solutions as software dependencies.
TC2	Programming language	Use Rust as programming language.
TC3	Tools	Use as much as possible the Rust ecosystem for software development and documentation.
TC4	Version control	Use Git and GitHub for version control.

ID	Constraints	Motivation
EMC1	Dimensions	The electronic dimension should not exceed 190x190[mm]
EMC2	Power cable	The electronic should be powered with a USB Micro-B cable.
EMC3	User input	The electronic should provide at least a push-button for interacting with the system.
EMC4	Labels	The electronic should be labeled for user with no electronic knowledge.
EMC5	Fixation	The electronic should provide 4x 4[mm] fixation holes.