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        • C
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      • PIC32
        • C
          • NECTO Studio
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        • Basic
          • mikroBasic PRO for PIC32
        • Pascal
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        • Additional Software
          • CODEGRIP WiFi license
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          • Visual TFT
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          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • ARM
        • C
          • NECTO Studio
          • mikroC PRO for ARM
        • Basic
          • mikroBasic PRO for ARM
        • Pascal
          • mikroPascal PRO for ARM
        • Additional Software
          • CODEGRIP WiFi license
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          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • AVR
        • C
          • NECTO Studio
          • mikroC PRO for AVR
        • Basic
          • mikroBasic PRO for AVR
        • Pascal
          • mikroPascal PRO for AVR
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • FT90x
        • C
          • mikroC PRO for FT90x
        • Basic
          • mikroBasic PRO for FT90x
        • Pascal
          • mikroPascal PRO for FT90x
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • 8051
        • C
          • mikroC PRO for 8051
        • Basic
          • mikroBasic PRO for 8051
        • Pascal
          • mikroPascal PRO for 8051
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
    • Dev Boards
      • PIC (8-bit)
        • 8th Generation
          • Fusion for PIC v8
          • EasyPIC PRO v8
          • EasyPIC PRO v8 over USB-C
          • EasyPIC v8
          • EasyPIC v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC PRO v7a
          • PICPLC16 v7a
          • EasyPIC v7a
          • EasyPIC PRO v7
          • EasyPIC v7
        • 6th Generation
          • PICPLC16 v6
      • dsPIC/PIC24 (16-bit)
        • 8th Generation
          • EasyPIC v8 PIC24/dsPIC33
          • EasyPIC v8 for dsPIC30
          • EasyPIC v8 for dsPIC30 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
          • EasyPIC v7 for dsPIC30
        • 6th Generation
          • Easy24-33 v6
      • PIC32 (32-bit)
        • 8th Generation
          • Fusion for PIC32
          • Fusion for PIC32 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
      • ARM (32-bit)
        • 8th Generation
          • Fusion for ARM v8
          • Fusion for ARM v8 over USB-C
          • Fusion for STM32 v8
          • Fusion for STM32 over USB-C
          • Fusion for KINETIS v8
          • Fusion for Kinetis v8 over USB-C
          • Fusion for TIVA v8
          • Fusion for TIVA v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyMx PRO v7a STM32
          • EasyMx PRO v7 STM32
          • EasyMx PRO v7 Tiva
      • AVR (8-bit)
        • 8th Generation
          • EasyAVR v8
          • EasyAVR PRO v8
          • EasyAVR PRO v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyAVR v7
        • 6th Generation
          • AVRPLC16 v6
      • 8051 (8-bit)
        • 7th generation
          • BIG8051
        • 6th Generation
          • Easy8051 v6
      • PSoC (8-bit)
        • 6th Generation
          • UNI-DS6 Development System
      • RISC-V (32bit)
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
      • Universal Boards
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
          • Fusion for PIC v8
          • Fusion for ARM v8
        • 7th Generation
          • EasyPIC Fusion v7
        • 6th Generation
          • UNI-DS6
          • mikroBoard for PIC 80-pin
          • mikroBoard for AVR
          • mikroBoard for dsPIC
          • mikroBoard for PSoC
          • mikroBoard for 8051
          • mikroBoard for PIC 40-pin
          • mikroBoard for ARM
          • mikroBoard for ARM 144-pin
      • IoT - Wearable
        • Hexiwear
          • Hexiwear
          • Hexiwear Power User Pack
          • Hexiwear Docking Station
          • Hexiwear Battery Pack
          • Hexiwear Color Pack
          • Hexiwear Workstation
      • Analog Boards
        • 7th Generation
          • Analog System Lab Kit PRO
    • Starter Boards
      • PIC (8-bit)
        • Clicker
          • PIC clicker
        • Clicker 2
          • Clicker 2 for PIC18FJ
          • Clicker 2 for PIC18FK
        • Clicker 4
          • Clicker 4 for PIC18F
          • UNI Clicker
        • Ready
          • Ready for PIC Board
          • Ready for PIC (DIP28)
          • PIC-Ready2 Board
          • MMC Ready Board
        • StartUSB
          • StartUSB for PIC
      • dsPIC/PIC24 (16-bit)
        • Clicker 2
          • Clicker 2 for PIC24
          • Clicker 2 for dsPIC33
        • Clicker 4
          • UNI Clicker
        • Ready
          • dsPIC-Ready1 Board
          • dsPIC-Ready2 Board
          • DsPIC-Ready3 Board
          • dsPIC-Ready4 Board
      • PIC32 (32-bit)
        • Clicker
          • PIC32MX clicker
          • 6LoWPAN Clicker
          • PIC32MZ clicker
        • Clicker 2
          • Clicker 2 for PIC32MX
          • Clicker 2 for PIC32MZ
        • Clicker 4
          • UNI Clicker
        • MINI
          • MINI-32 Board
          • MINI-32 for PIC32MZ
        • Flip&Click
          • Flip&Click PIC32MZ
      • ARM (32-bit)
        • Clicker
          • RA4M1 Clicker
          • Kinetis Clicker
          • MSP432 Clicker
          • CEC1702 clicker
          • CEC1302 Clicker
          • STM32 M4 clicker
        • Clicker 2
          • Clicker 2 for STM32
          • Clicker 2 for Kinetis
          • Clicker 2 for CEC1702
          • Clicker 2 for MSP432
          • Clicker 2 for CEC1302
          • Clicker 2 for PSoC 6
        • Clicker 4
          • Clicker 4 for STM32F745VG
          • Clicker 4 for STM32F4
          • Clicker 4 for TMPM3H
          • Clicker 4 for TMPM4K
          • Clicker 4 for STM32
          • UNI Clicker
        • MINI
          • MINI-M4 for STM32
          • MINI-M4 For Kinetis
          • MINI-M4 for Tiva
          • MINI-M4 for Stellaris
          • MINI-M4 for MSP432
          • MINI-M0 for STM32
        • Flip&Click
          • Flip&Click SAM3X
      • AVR (8-bit)
        • Clicker 4
          • UNI Clicker
        • MINI
          • MINI-AT Board - 3.3V
          • MINI-AT Board - 5V
        • Ready
          • Ready for AVR Board
          • Ready For XMEGA
          • mikroXMEGA Board
          • AVR-Ready2 Board
        • StartUSB
          • StartUSB for AVR
      • 8051 (8-bit)
        • Ready
          • 8051-Ready Board
      • FT90x (32-bit)
        • Clicker 2
          • Clicker 2 for FT90x
      • Miscellaneous
        • USB
          • USB Wizard
          • Quail
          • FlowPaw Kit
      • Universal Boards
        • Clicker 4
          • UNI Clicker
    • Prog-Debug
      • PIC (8-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
          • CODEGRIP for PIC USB-C
        • mikroProg
          • mikroProg for PIC
      • dsPIC/PIC24 (16-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
        • mikroProg
          • mikroProg for dsPIC
      • PIC32 (32-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
          • CODEGRIP for PIC USB-C
        • mikroProg
          • mikroProg for PIC32
      • ARM (32-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP USB-C
          • CODEGRIP for ARM
          • CODEGRIP for ARM USB-C
          • CODEGRIP for STM32
          • CODEGRIP for KINETIS
          • CODEGRIP for Tiva
          • CODEGRIP for Tiva USB-C
        • mikroProg
          • mikroProg for STM32
          • mikroProg for Tiva
          • mikroProg for Kinetis
          • mikroProg for CEC
          • mikroProg for MSP432
          • mikroProg for PSoC 5LP
      • AVR (8-bit)
        • CODEGRIP
          • CODEGRIP for AVR
          • CODEGRIP for AVR - USB-C
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
        • mikroProg
          • mikroProg for AVR
      • 8051 (8-bit)
        • mikroProg
          • mikroProg for 8051
      • FT90x (32-bit)
        • mikroProg
          • mikroProg for FT90x
    • Smart Displays
      • 2.8"
        • ARM (32-bit)
        • AVR (8-bit)
        • dsPIC/PIC24 (16-bit)
        • PIC (8-bit)
        • PIC32 (32-bit)
      • 3.5"
        • ARM (32-bit)
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        • PIC (8-bit)
        • PIC32 (32-bit)
      • 4.3"
        • ARM (32-bit)
        • FT90x (32-bit)
        • PIC (8-bit)
        • PIC32 (32-bit)
      • 5"
        • ARM (32-bit)
        • FT90x (32-bit)
        • PIC32 (32-bit)
      • 7"
        • ARM (32-bit)
        • FT90x (32-bit)
    • MCU Cards
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        • 8th Generation
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      • PIC32 (32-bit)
        • 8th Generation
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      • ARM (32-bit)
        • 8th Generation
        • 7th Generation
      • AVR (8-bit)
        • 8th Generation
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        • 8th Generation
    • Accessories
      • TFT Displays
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MikroElektronika white logo
  • Products
    • click boards icon Click Boards
      • Wireless Connectivity
        • GPS/GNSS
        • GSM/LTE
        • LTE IoT
        • BT/BLE
        • WiFi
        • RFID/NFC
        • GSM+GPS
        • 6LoWPAN
        • ZigBee
        • UWB
        • SigFox
        • Sub-1 GHz Transceievers
        • 2.4 GHz Trancevers
        • LoRa
        • WiFi+BLE
      • Sensors
        • Biometrics
        • Gas
        • Magnetic
        • Motion
        • Optical
        • Pressure
        • Proximity
        • Temperature & humidity
        • Current sensor
        • Miscellaneous
        • Environmental
        • Force
        • Inductance
        • RF meter
        • Click Shields
        • Click Bundles
      • Interface
        • Adapter
        • CAN
        • Port expander
        • RS485
        • USB
        • 1-Wire
        • RS232
        • Ethernet
        • LIN
        • PWM
        • Current
        • DALI
        • I2C
        • Fiber optics
        • SPI
        • DMX
        • CXPI
        • Click Shields
        • Click Bundles
      • Display & LED
        • LED Drivers
        • LED Matrix
        • LED Segment
        • OLED
        • LCD
        • TFT
        • Click Shields
        • Click Bundles
      • Miscellaneous
        • Relay
        • Optocoupler
        • ID
        • Proto
        • Encryption
        • Click Shields
        • Click Bundles
      • Mixed Signal
        • ADC
        • Measurements
        • DAC
        • Digital potentiometer
        • ADC-DAC
        • Click Shields
        • Click Bundles
      • Storage
        • EEPROM
        • FLASH
        • FRAM
        • microSD
        • MRAM
        • SRAM
        • EERAM
        • ReRAM
        • DRAM
        • Click Shields
        • Click Bundles
      • Motor Control
        • Brushed
        • Brushless
        • Servo
        • Stepper
        • Click Shields
        • Click Bundles
      • Audio & Voice
        • Amplifier
        • Microphone
        • Speakers
        • Signal Processing
        • Speech recognition
        • FM
        • MP3
        • Click Shields
        • Click Bundles
      • HMI
        • Capacitive
        • Pushbutton/Switches
        • Potentiometers
        • Rotary encoder
        • Haptic
        • Fingerprint
        • Click Shields
        • Click Bundles
      • Clock & Timing
        • RTC
        • Clock generator
        • Click Shields
        • Click Bundles
      • Power Management
        • Battery charger
        • Boost
        • Buck
        • Linear
        • Buck-Boost
        • Wireless Charging
        • Power Switch
        • USB-C PD
        • Click Shields
        • Click Bundles
      • Click Bundles
      • Click Shields
    • necto icon NECTO
      • NECTO Studio
    • compilers icon Compilers
      • PIC
        • C
          • NECTO Studio
          • mikroC PRO for PIC
        • Basic
          • mikroBasic PRO for PIC
        • Pascal
          • mikroPascal PRO for PIC
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • dsPIC/PIC24
        • C
          • NECTO Studio
          • mikroC PRO for dsPIC
        • Basic
          • mikroBasic PRO for dsPIC
        • Pascal
          • mikroPascal PRO for dsPIC
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • PIC32
        • C
          • NECTO Studio
          • mikroC PRO for PIC32
        • Basic
          • mikroBasic PRO for PIC32
        • Pascal
          • mikroPascal PRO for PIC32
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • ARM
        • C
          • NECTO Studio
          • mikroC PRO for ARM
        • Basic
          • mikroBasic PRO for ARM
        • Pascal
          • mikroPascal PRO for ARM
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • AVR
        • C
          • NECTO Studio
          • mikroC PRO for AVR
        • Basic
          • mikroBasic PRO for AVR
        • Pascal
          • mikroPascal PRO for AVR
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • FT90x
        • C
          • mikroC PRO for FT90x
        • Basic
          • mikroBasic PRO for FT90x
        • Pascal
          • mikroPascal PRO for FT90x
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • 8051
        • C
          • mikroC PRO for 8051
        • Basic
          • mikroBasic PRO for 8051
        • Pascal
          • mikroPascal PRO for 8051
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
    • dev boards icon Dev Boards
      • PIC (8-bit)
        • 8th Generation
          • Fusion for PIC v8
          • EasyPIC PRO v8
          • EasyPIC PRO v8 over USB-C
          • EasyPIC v8
          • EasyPIC v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC PRO v7a
          • PICPLC16 v7a
          • EasyPIC v7a
          • EasyPIC PRO v7
          • EasyPIC v7
        • 6th Generation
          • PICPLC16 v6
      • dsPIC/PIC24 (16-bit)
        • 8th Generation
          • EasyPIC v8 PIC24/dsPIC33
          • EasyPIC v8 for dsPIC30
          • EasyPIC v8 for dsPIC30 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
          • EasyPIC v7 for dsPIC30
        • 6th Generation
          • Easy24-33 v6
      • PIC32 (32-bit)
        • 8th Generation
          • Fusion for PIC32
          • Fusion for PIC32 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
      • ARM (32-bit)
        • 8th Generation
          • Fusion for ARM v8
          • Fusion for ARM v8 over USB-C
          • Fusion for STM32 v8
          • Fusion for STM32 over USB-C
          • Fusion for KINETIS v8
          • Fusion for Kinetis v8 over USB-C
          • Fusion for TIVA v8
          • Fusion for TIVA v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyMx PRO v7a STM32
          • EasyMx PRO v7 STM32
          • EasyMx PRO v7 Tiva
      • AVR (8-bit)
        • 8th Generation
          • EasyAVR v8
          • EasyAVR PRO v8
          • EasyAVR PRO v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyAVR v7
        • 6th Generation
          • AVRPLC16 v6
      • 8051 (8-bit)
        • 7th generation
          • BIG8051
        • 6th Generation
          • Easy8051 v6
      • PSoC (8-bit)
        • 6th Generation
          • UNI-DS6 Development System
      • RISC-V (32bit)
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
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  1. Home
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  3. 10 Degrees of Freedom - And You Thought 1 Freedom was Enough

10 Degrees of Freedom - And You Thought 1 Freedom was Enough

Published: 25/01/2016 | Post categories: Click boards, Learn

| Views:11852

10 Degrees of Freedom - And You Thought 1 Freedom was Enough

Unmanned aerial vehicles, or commonly known  as "drones", are becoming more and more popular. People now use them for all sorts of tasks, from filming cool aerial shots with their camera, to exploring inaccessible parts of planet Earth, where the human foot cannot step. But, have you ever wondered how these machines maintain their balance and orientation? The answer is using gyroscopes and accelerometers. Our 10 Degrees of Freedom provides you with the Bosch BNO055 absolute orientation sensor, which contains a digital accelerometer, gyroscope, and magnetometer.

Each one of these provides you with three axis of orientation (x, y and z), add all that up, and you have 9 degrees of freedom, so where's the 10th? Our hardware engineers here at MikroElektronika decided to round it all up and give you a tool for full orientation measurement - the 10DOF click  has one more chip from Bosch, the BMP180 pressure sensor, which will allow you to measure the altitude of your device.  Source code and examples can be found on Github or Libstock.

Now let's do the math once again: 3 axis for measuring the acceleration and orientation of your device, 3 axis for measuring the angular velocity and position, 3 axis for measuring directions of magnetic fields around the device, and one pressure value for determining the altitude - our drone can never get lost ( we hope )!

Now we can go through all of these in more detail, so you can know how to program your vehicle and keep it from wandering around clueless.

Accelerometer

An accelerometer is a device that measures acceleration forces, or simply put, the rate of change of velocity of an object. The forces which change the velocity of our object can be static or dynamic. The best example of a static force is the gravitational force, which is constantly pulling us down with an acceleration of 9.8 m/s^2. Dynamic forces are those caused by movement or vibration of our device. So, when you check the values of your accelerometer, if it is laying flat on your working table, don't be suprised to see around 9m/s^2 on your Z axis. Your X and Y may also be active, since they can detect vibrations caused by your computer, your music playing loud, or that loud neighbor that just keeps moving furniture around their apartment all day.
Now let's go over the units of measurement. The unit for acceleration is meter per second squared ( m/s^2). Most accelerometers also offer one alternative, which is G (gravity). One G is the value of gravitational pull of our planet Earth, which is, as stated, 9.8 m/s^2. Put in perspective, if you push down your object hard enough, and measure 2 Gs, it would be as if the gravity here on Earth was twice as much as now - imagine weighing twice or three times as much as you do now, you would have a hard time moving, since your muscles are used to your original weight.

Accelerometers usually have a range of measurement. Usually it is stated in Gs. Our accelerometer can go from +- 2Gs to +-16Gs. You should choose which one suits your project best - if you want to register how much your car vibrates when running in 5th gear, +-2Gs will be mostly precise for you, however, if you want to measure how much your car accellerated while pushing the pedal to the medal in 5th gear, you might need a little bigger range.
Setting your desired range is simple with the library we provided, also you can set the unit of measurement to mili-Gs or m/s^2:

bno055_set_accel_range(0x04);
bno055_set_accel_unit(0x01);

How do accelerometers work?

Accelerometer description

Some accelerometers use the piezoelectric effect - they often  contain microscopic crystal structures that change with acceleration forces, which causes a voltage to be generated. Another way  is by sensing changes in capacitance : if you have two micro-structures next to each other, they have a certain capacitance between them. If an accelerative force moves one of the structures, then the capacitance will change. Converting from capacitance to voltage, you get an accelerometer. There are even more methods, including use of the piezoresistive effect, hot air bubbles, and light.

Setting off

Once you have set your desired range and unit of measurement, you can start measuring and experimenting with your accelerometer! There are also much more options and settings, but getting basic measures is the starting point. For more detailed settings you can always check out the documentation provided with our library.

Gyroscope

What's a gyroscope?

Gyroscopes are  devices that measure or maintain rotational motion, or better put, measure angular velocity. Angular velocity, simply put, is speed in rotation. It is expressed in degrees per second (dps) or rotations per second (rps).

Gyroscopes determine orientation and are found in most autonomous navigation systems. When we want to balance our drone, a gyroscope can be used to measure rotation from the balanced position and send corrections to our motor.

A triple axis MEMS gyroscope, similar to the one we have on the 10DOF, can measure rotation around three axes: x, y, and z. The measurements are used to maintain the balance of our object. Airplanes also use gyroscopes to maintain their balance.

How do gyroscopes work?

The MEMS part of the gyroscope sensor is tiny (between 1 to 100 micrometers, the size of a human hair). When the gyro is rotated, a small resonating mass is shifted as the angular velocity changes. This movement is converted into very low-current electrical signals that can be amplified and read by a host microcontroller.

Like accelerometers, gyros also have their range, it can be set using similar functions to those with the accelerometer:

bno055_set_gyro_range(0x04);

Setting off

Once you got your range set, you can freely go and write code for your drone or robot. Like with the accelerometer, there are different settings which you can use to better the quality of your measurement, you can look it up in the documentation of the provided library.

Magnetometer

Magnetometers are measurement instruments used for two general purposes: to measure the magnetization of a magnetic material, or to measure the strength and, in some cases, the direction of the magnetic field at a point in space. Our 10DOF click uses these measures as a compass, to help the device maintain orientation. Our magnetometer is a vector magnetometer, which means it measures the flux density value in a specific direction in 3 dimensional space. These values can help us determine which way is North, South, East and West.

Reading these values with our library is pretty easy:

bno055_convert_float_mag_x_uT(&mag_x);
bno055_convert_float_mag_y_uT(&mag_y);
bno055_convert_float_mag_z_uT(&mag_z);

The magnetic vector here is represented in units of micro-Tesla.

Initialization and usage of the 10DOF click

Now that you understand the basics of our click, you can get to work! Building a drone which will fly inside a volcano? A robot that can bring you coffee and not spill it? Whatever your project is, if you need balance - 10DOF has got it!

The 10DOF has 13 different operation modes, as stated in the datasheet, on page 20. On power-on, the device is in configuration mode, and not reading any values. This is the only mode in which all the writable register map entries can be changed.

If you don't want to change anything, you can change the  mode to a desired one.
After setting the mode, you can set the range and unit for the gyroscope and accelerometer measurements, and you're ready to go!
Here's a simple example of working with the 10DOF click:

First, make sure you initialize the I2C bus, assert the correct I2C slave addresses, and call the initialization functions:

I2C1_Init_Advanced(400000, &_GPIO_MODULE_I2C1_PB67 );
Delay_ms(200);
bmp180.dev_addr = BMP180_I2C_ADDR;
bno055.dev_addr = BNO055_I2C_ADDR1;

bmp180_init( &bmp180 );
bno055_init( &bno055 );

Next, set the operation mode, and your desired units and ranges:

bno055_set_operation_mode(0x0C);
bno055_set_accel_range(0x02);
bno055_set_accel_unit(0x01);
bno055_set_gyro_range(0x04);
bno055_set_gyro_unit( 0x01 );

And the 10DOF is ready! Reading your desired values is easy:

These functions return float values of positioning on x, y and z axis of the gyroscope.

bno055_read_euler_h(&euler_h);
bno055_read_euler_p(&euler_p);
bno055_read_euler_r(&euler_r);

or you can read the angular velocity in degrees per second on the gyroscope.

bno055_convert_float_gyro_x_dps(&gyro_x);
bno055_convert_float_gyro_y_dps(&gyro_y);
bno055_convert_float_gyro_z_dps(&gyro_z);

The following functions return float values of x, y and z axis of the accelerometer in mili-Gs.

bno055_convert_float_accel_x_mg( &accel_x );
bno055_convert_float_accel_y_mg( &accel_y );
bno055_convert_float_accel_z_mg( &accel_z );

Last but not least, read the magnetometer values, also in a float data type.

bno055_convert_float_mag_x_uT(&mag_x);
bno055_convert_float_mag_y_uT(&mag_y);
bno055_convert_float_mag_z_uT(&mag_z);

There are many more functions available in the library provided, feel free to check them out, and use the 10DOF click to it's full potential!

Example

/*******************************************************************************
* Title                 :   RTC Implementation
* Filename              :   rtc.c
* Author                :   Viktor
* Origin Date           :   10/01/2016
* Notes                 :   None
*******************************************************************************/
/*************** MODULE REVISION LOG ******************************************
*
*    Date    Software Version    Initials   Description
*  08/12/15         .1              RBL      Module Created.
*
*******************************************************************************/
/**
 * @file 10DOF_click.c
 *
 * @brief This module contains the example of the 10DOF click
 */
/******************************************************************************
* Includes
*******************************************************************************/
#include "bmp180.h"
#include "bno055.h"
#include 
#include "DOF10_objects.h"

/******************************************************************************
* Module Preprocessor Constants
*******************************************************************************/

/******************************************************************************
* Module Preprocessor Macros
*******************************************************************************/

/******************************************************************************
* Module Typedefs
*******************************************************************************/

/******************************************************************************
* Module Variable Definitions
*******************************************************************************/
struct bmp180_t bmp180;
struct bno055_t bno055;
uint8_t temp = 3;

float accel_x;
float accel_y;
float accel_z;
float gyro_x;
float gyro_y;
float gyro_z;
float mag_x;
float mag_y;
float mag_z;
int int_gyro_x;
int int_gyro_y;
int int_gyro_z;
uint8_t range;
char buffer[1];
char txt[10];

int16_t euler_h;
int16_t euler_p;
int16_t euler_r;

int32_t temperature_int;
float temperature_float;
int32_t pressure;

/******************************************************************************
* Function Prototypes
*******************************************************************************/
void system_init( void );
void process_pressure( void );
void process_temperature( void );
void process_magnet( void );
void process_accel( void );
void process_gyro( void );

/******************************************************************************
* Function Definitions
*******************************************************************************/
void system_init()
{
    I2C1_Init_Advanced( 400000, &_GPIO_MODULE_I2C1_PB67 );
    Delay_ms( 200 );
    bmp180.dev_addr = BMP180_I2C_ADDR;
    bno055.dev_addr = BNO055_I2C_ADDR1;

    bmp180_init( &bmp180 );
    temp =  bno055_init( &bno055 );

    GPIO_Digital_Input( &GPIOA_IDR,
                        _GPIO_PINMASK_0 );  // Set PA0 as digital input
}

void process_pressure()
{
    uint32_t temp_press;
    
    temp_press = bmp180_get_uncomp_pressure();
    pressure = bmp180_get_pressure( temp_press );
}

void process_temperature()
{
    uint16_t temp;

    temp = bmp180_get_uncomp_temperature();
    temperature_int = bmp180_get_temperature( temp );
    temperature_float = ( float ) temperature_int;
    temperature_float *= 0.1f;
}

void process_magnet()
{
    bno055_convert_float_mag_x_uT( &mag_x );
    bno055_convert_float_mag_y_uT( &mag_y );
    bno055_convert_float_mag_z_uT( &mag_z );
}

void process_accel()
{
    bno055_convert_float_accel_x_mg( &accel_x );
    bno055_convert_float_accel_y_mg( &accel_y );
    bno055_convert_float_accel_z_mg( &accel_z );
}

void process_gyro()
{
    bno055_read_euler_h( &euler_h );
    bno055_read_euler_p( &euler_p );
    bno055_read_euler_r( &euler_r );
}

void main()
{
    system_init();
    
    bno055_set_operation_mode( 0x0C );
    bno055_set_accel_range( 0x01 );
    bno055_get_accel_range( &range );
    bno055_get_operation_mode( &buffer );
    bno055_get_accel_unit( &temp );
    bno055_set_gyro_range( 0x04 );
    bno055_get_gyro_range( &range );

    while( 1 )
    {
        process_gyro();
        process_accel();
        process_temperature();
        process_pressure();
        process_magnet();

        // Do some magic with the data

        Delay_ms( 250 );
    }
}

Summary

Being one of the most ubiquitous sensors on the planet, accelerometers, gyros, and magnetometers are found in everything from small children's toys, phones, to large aircraft, and ships.  Making use of each of the physical world measurements enable an application to expand capabilities that can co-exist in a physical world.  Drones are a common example but can be used in applications such as health care.  Devices can sample the outside world and the patient they are attached to and can keep the elderly from falling or even tripping.  Mastery of this technology is a valuable element in any embedded project.

References

wikipedia.org "Accelerometer" wikipedia 2016
wikipedia.org "Gyroscope" wikipedia 2016
science.howstuffworks.com "Gyroscope" howstuffworks 2016
wikipedia.org "Magnetometer" wikipedia 2016

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