A sound tube is a very intuitive gadget: Make a sound in one end of the tube. Close it to store the sound inside the tube. Release the sound by opening the tube's other end.
To indicate that a message is waiting to be released, a string of leds lights up when the tube is put down vertically, with the speaker-side up. When the speaker-side is down, the leds are off.
My first idea was to make a Sound Jar
with just one opening, the jars' lid. Open the jar, make a sound into the jar and close it. The stored sound should be set free when opening the jar again. Making that work turned out to be a little tricky for me. So I made the jar into a tube, which simplified the electronics a lot.
We use our new Sound Tube as a message container, replacing the notes on the kitchen table to tell family members our whereabouts and yes, they can have some cookies. Other kinds of use can be seen in the video...No video playing? Have a look at it here...
The Sound Tube works really well and it is very intuitive in it's use. Picture 3 in this step is a sketch of the upcoming Sound Tube version 2.0. Idea is to stick together two funnels to get the shape in the sketch. Or 3D-print the whole casing in one time...
If anyone has thoughts on how to turn this Sound Tube into a real Sound Jar with just one lid to open (even more intuitive!?), please let me know :-)
Making this Sound Tube is not very difficult. The heart of the machine is a hacked voicerecorder, that can be bought at various spots. The circuit that makes the leds blink is very basic and well doable for starters in electronics and soldering (although some precision-soldering was required at one point with my particular voicerecorder). When you have the stuff needed, the Sound Tube can be made in a couple of hours, I think. Have fun!