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Seismograph Keyboard Converts MMA8451 Accelerometer Data to A-Z Keystrokes

Thanks as always to Trammell for sharing full build notes on these projects!

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This project combines an Adafruit Trinket with a i2c accelerometer to create a USB seismograph. The output is sent as the keys A to Z to make it easy to integrate with environments like Scratch.

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Adafruit Trinket – Mini Microcontroller – 5V Logic: Trinket may be small, but do not be fooled by its size! It’s a tiny microcontroller board, built around the Atmel ATtiny85, a little chip with a lot of power. We wanted to design a microcontroller board that was small enough to fit into any project, and low cost enough to use without hesitation. Perfect for when you don’t want to give up your expensive dev-board and you aren’t willing to take apart the project you worked so hard to design. It’s our lowest-cost arduino-IDE programmable board! Read more.


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Adafruit Triple-Axis Accelerometer – ±2/4/8g @ 14-bit – MMA8451: So many accelerometers and so little time! We’ve expanded our accelerometer selection even more with this high-precision and inexpensive MMA8451 Triple-Axis Accelerometer w/ 14-bit ADC. You can detect motion, tilt and basic orientation with a digital accelerometer – and the MMA8451 is a great accelerometer to start with. It has a wide usage range, from +-2g up to +-8g yet is easy to use with Arduino or another microcontroller. Read more.


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