The Magic Wand Example

Introduction

The magic wand example shows how to detect gestures using an accelerometer. Different types of accelerometers are easily available:

• The ADXL345 is a tree axis digital accelerometer by Analog Devices
  
• The MPU6050 is a six axis device (Gyro and Accelerometer) from Ivensense. It is described by it datasheet and the register description.
  
• The LIS2dH MEMS digital output motion sensor from ST Microelectronics is an ultra low power high performance 3 axis accelerometer.

I mounted the accelerometer onto a WeMos D1 prototype board. With the triple base and the CPU this makes up for a stable assembly that can easily be moved without cable contact problems.

Hardware connections

The MPU6050 is connected to the WeMos D1 bus as follows:

The ADXL345 is connected as follows:

Providing a training data set

In order to provide a training data set we must be able to record gestures. Therefore a driver for the accelerometer is needed as well as a program that recognizes movement and writes the accelerometer data on a file.

-- Uli Raich - 2022-02-02

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