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The final project consists of several elements you have been introduced to in the course of the advent time. One function is the Cheerlights function presented the day before. You can also receive the current colour of the Cheerlights project and display it with the RGB-LED. The board is also used for long-term monitoring of the temperature. At the same time, the board is used to emit an alarm sound when the temperature exceeds a specific value, e.g. because there is a fire. As a last function, the board can be used as a Christmas bell, by making it play the song Jingle Bells with a time-controlled TalkBack command. All in all, today’s project is an all-rounder for the Christmas tree. ...

Today’s experiment is based on a project by Hans Scharler that is called Cheerlights. The idea is globally linked lights that can be simultaneously controlled via Twitter commands. It is a good example of the world growing closer and closer together with the Internet. The circuit is similar to previous projects Behind today’s door, you will find a fourth extension cable with which the RGB-LED can also be placed aside. This can be particularly practical if, for example, you want to hide the board in the Christmas tree while the RGB-LED decorates the top of the tree. ...

Today’s project is an alarm system with which you can, for example, check whether someone opens a drawer without permission. There is a continuous check for whether the connected light sensor is exposed to too much light. If this is the case, an alarm signal will sound and a message will be sent via Twitter. Lightsensor on A0 and Piezo on D8 Behind today’s door, there is a Piezo speaker that is used as alarm signal encoder. The structure of today’s experiment is shown in the figure. ...