Orientation Sensor

created by AWI , updated by hek

Orientation sensors are popular in e.g. flight control and mobile phones. This sensor uses a MPU 9250 which consists of a Gyroscope/ Accelerometer/ Magnetometer (compass) and BMP280 - barometer/ temperature. The board in the aliexpress link in BOM works on 5 and 3.3V and includes sufficient pull-up for I2C high speed.

This is an advanced device which makes it possible to determine the exact orientation/ movement and altitude.. Mounted to @GertSanders "Battery based atmega328p sensor" this makes a perfect "Orientation sensor" with a simple I2C interface.

Orientation Sensor

In the video you can see the sensor at work with a two servo pan/tilt actuator.

As there (currently) is no "Orientation type" for MySensors I have created my own type as a subset from the V_TEXT type. V_ORIENTATION = Yaw ; Pitch ; Roll

Yaw - for the orientation in the vertical plane Pitch - orientation in the horizontal plane Roll - the position of the object (e.g. aircraft) around its own axis. (not used in the example)

The "Modern devices - motion plug" Arduino library is used to read the sensor and have acceptable position readings. The Yaw, Pitch and Roll are calculated from the 9 axis readings of accelaration, magnetic field an gyroscope and are pretty stable. For who is interested in the theory & calculations ;) quaternions

The sketch sends the values if there is a more than one degree change in any direction.

As (currently) no controller can handle the V_ORIENTATION type the information is send directly to a node/actuator.

An example will be published separately as "Orientation actuator".

Images

Source Code

NameSize# Downloads
AWI_OrientationSensor.ino5.88 kB429

Bill of Material

QtyValueDevicePackagePartsDescriptionMFMPNAliexpress or ebay link
1CustomBattery based atmega328p sensor board, populatedCustom boardGertSanders board or any MySensors Board with radiohttps://www.openhardware.io/view/5/Battery-based-atmega328p-...
1MPU925010DOF I2C boardBoardCombined 9 axis / barometer boardAliExpress: http://nl.aliexpress.com/item/MPU9250-BMP280-SPI...
4Dupont wiresFemale/ female to connect I2C

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Sensors & Actuators

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