Mood is very important for the world of work, since it not only allows you to locate problems between work groups but also allows you to know if the team will obtain the maximum performance during its working day.
A programmer named Katja Budnikov has used the Hardware Libre to create a machine that records the mood of workers and thus help locate future problems or find solutions to improve performance. The happiness machine is very simple, you only need a Raspberry Pi, several LED lights and several buttons. Everything connected offers a data collection box that ask the user what their mood is. Once we enter the data, the happiness machine records it and saves it in a database. In addition, Katja Budnikov inserted an lcd panel showing the general index, but this is updated with certain seconds of delay to prevent possible manipulations.
The happiness machine was placed at the door of Katja Budnikov's office in order for her colleagues to collaborate with the survey. The response from his colleagues has been positive, but it is also true that in his case, the answers may be falsified due to the presence of the creator of the machine.
In any case, this happiness machine is a great project to build for the office, or just plain to place in a store and know the mood of the customers before buying. If you want to have a machine like this, in this link (You will need Google Translator), Katja Budnikov has uploaded the construction guide with everything you need to create the artifact.
Personally I find it an interesting project, interesting for its simplicity and for all the potential that this happiness machine has, potential within the business world.