Days-18

Last but not least, you will find another programmable RGB-LED behind the door of the Advent calendar. Thus, we have two LEDs which you can interconnect to light your Christmas tree. We will need the following setup today. Activate the…
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The day before last reveals a tilt sensor behind the door of the Advent calendar. The sensor detects, if it is tilted. We will use it today as a sensor for an alarm system. The speaker from two days ago…
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The door of day 21 reveals again a sensor, which we will use to measure the humidity level present. With the following circuit we will build a comprehensive indoor climate monitor. Our experiment today uses three sensors: the temperature sensor…
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The door of day 21 reveals a loudspeaker. We will use it in our experiment today to play some music. We will need a very simple setup for this. In our experiment we will connect the speaker to one of…
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Behind the door is an NTC resistor (Negative Temperature Coefficient) that measures the temperature. Together with the photo transistor and a few wires, we are going to build a plant guard that alerts us, when a plant it is monitoring…
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Today we have a very special LED waiting behind the door. It is an RGB LED with integrated controller (type PL9823, equivalent to WS2812) and with it you can now connect several LEDs in series and control them individually by…
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And today we have a small diode waiting behind the door. We are going to use the diode as temperature sensor for particular high temperatures and with it we will build a small candle guard. Today’s setup consists of the…
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The door of day 17 reveals another potentiometer. Now we have one potentiometer for each LED and thus we will develop the program of Day 13, the Smart Lights, so that we will get a more convenient and intuitive dimming feature. We…
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The door today reveals the counterpart to yesterday’s component, namely an IR diode. Now you can build a real remote-control for your TV and control it conveniently via smartphone and website.  We will use the following setup. Select the program…
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The door reveals a very special component today, namely an infrared receiver module. You can use it to 15. Tag receive customary infrared remote-control signals. We will use the following setup. After the circuit is set up, select today’s program….
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