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Acorn Chime. Our goal was to come up with a project which represented our personalities, and used an Arduino. We decided to use a LilyPad -- but hadn't settled on anything else. A week went by, and we shot ideas back and forth over email. We wanted to have it make sound, wanted to have it have something to do with nature, wanted to keep it simple enough that we could actually implement it in the available time. The idea of doing a wind chime thing came up -- the actuation is simple (just switches, no fancy temperature or humidity sensors to configure), so it seemed feasible. We got together, and Charlie brought some acorns; their natural beauty sealed the form factor of hanging acorns under the LilyPad.

Hacking. Tutorials. Sensitive Fingertips. Pressure sensors on your fingertips intended for use by children and their piano teachers to visualize the difference between "p" piano (soft) and "f" forte (hard). The pressure sensitive layers of fabric in the fingertips of these gloves are stretchy so that they can fit tightly. The sensors are made from stretch conductive fabric and piezoresistive Eeonyx fabric. The glove is connected to the Arduino via metal snaps and a fabric cable made from sewn conductive thread traces. HOW THE SENSOR WORK The piezoresistive effect describes the changing electrical resistance of a material under mechanical pressure. Eeonyx coats a range of anti-static woven and non-woven fabrics in an inherently conductive polymer, giving them piezoresistive properties.

Sensitive Fingertips is a collaboration between Dr. Videos. Accelerometer benchmarks. Part 2: LIS331AL and DE-ACCM2G (ADXL3. In a previous article I have analized 3 accelerometer side by side comparing their noise level. Today I am going to test a 3 axis accelerometer from ST LIS331AL. I am going to compare it with the DE-ACCM2G accelerometer from Dimension Engeneering. For testing purposes I have mounted the LIS331AL on a break-out board. If you're interested how this board can be done and device mounted make sure you read my article "DIY Surface Mount on a Budget". I have connected both accelerometers to my USB Gamepad device and will be using the Gamepad Configuration Software to trace the signals (although an osciloscope could be used instead).

Here is a close-up of the accelerometers being tested: Please note that in the first phase of the test the LIS331AL will not have any filters so I can see it's intrinsic noise level. Here are the test results: As you can see the noise level under low vibration , is acceptable compared to DE-ACCM2G. As you can see the filter capacitor makes a big difference. //starlino//