Difference: MagicWandOld (8 vs. 9)

Revision 92022-05-19 - UliRaich

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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
I wrote a pure MircoPython driver for the ADXL345 available at https://github.com/uraich/IoT-Course/tree/master/exercises/solutions/exercise_16/adxl345.

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The MPU6050 is a six axis device (Gyro and Accelerometer) from Ivensense. It is described by its datasheet and the register description document.
Jeff Rowberg has written a very complete MPU6050 driver for the Arduino in C++, which includes access to its Digital Motion Processor, whose description cannot be found anywhere on the WEB. I ported this driver to MicroPython together with a few example programs drafted after Jeff's C++ examples: https://github.com/uraich/IoT-Course/tree/master/exercises/solutions/exercise_16/mpu6050.

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The MPU6050 is a six axis device (Gyro and Accelerometer) from Ivensense. It is described by its datasheet and the register description document.
Jeff Rowberg has written a very complete MPU6050 driver for the Arduino in C++, which includes access to its Digital Motion Processor, whose description cannot be found anywhere on the WEB. I ported this driver to MicroPython together with a few example programs drafted after Jeff's C++ examples: https://github.com/uraich/IoT-Course/tree/master/exercises/solutions/exercise_16/mpu6050.

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The MPU9250 is very similar to he MOU6050 but has a magnetometer in addition. The MPU92/66 has the necessary pins to be accessed either through I2C or SPI.

The LIS2DH MEMS digital output motion sensor from ST Microelectronics is an ultra low power high performance 3 axis accelerometer.

Hardware

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INT

XDA and XCL are foreseen to control an external I2C bus, These pins are currently not used. AD0 allows to modify the MPU6050 I2C address and is also not used.

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The connections of the MPU92/63 are similar

MPU92/63 <-- -->	!WeMos	GPIO	I2C	SPI
AD0	D6	GPIO 19	Alternate module address	MISO
FSYNC	GND
GND	GND
INT	D1	GPIO22
NCS	D0			CS
SCL	D5	GPIO 18	SCL	SCK
SDA	D7	GPIO 23	SDA	MOSI
Vcc	5V

The ADXL345 is connected as follows:

ADXL345	WeMos D1 bus	GPIO
Vcc	5V

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