Here is an open source earthquake sensor based on the Wii Nunchuk. A Teensy is used to read the I2C accelerometer output: [via]
This article explores the suitability of a Wii nunchuk based USB accelerometer as an earthquake sensor for the Quake-Catcher Network (QCN) project. It examines the nunchuk over several metrics: precision and range, frequency response, total cost and availability.
Using a Wii Nunchuk as an earthquake sensor - [Link]











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