Quick Reference Guide
Each menu shows current date and time that is updated with the GPS data and internal Real Time Clock. When logging is enable, this information will change to the recording time and the log ID of the current data acquisition.
4 widgets are shown in each page to display information about the device and to perform action when selected. To switch between pages, simply continue changing widgets and the next page will appear with its widget associated to it.
The startting menu appears when the device is turned on. It shows the version of the logger as well as the MAC address for the wifi unit.
The main menu is where most of the action will occur. It lets you navigate between two pages of widget that are described below.
- Battery Widget : Voltage and Current consumption are shown in this section. When battery voltage is under 3.5V, the system is considered in low battery mode. The current Arduino firmware will last approximately 10 hours on a single charge. A led will turn on if the device is charging. No action when selected.
- GPS Widget : Green if we have a GPS "fix". Red otherwise. The message of the widget will also tell if it is "fix" or not. No action when selected.
- Logging Widget : Logging state is shown in the message of the widget and its color. White if not Logging and blue for logging. If the widget is red, it means no SD Card is present. Selecting this widgets will change the state between logging and not logging.
- SD Card Widget : There is two modes, either you are connected or diconected to USB. When connected, the SD card is connected to the computer for file transfer otherwise, its connected to the logger allowing to start logging. If the widget is red, it means no SD Card is present. Selecting this widget let you change between the two modes.
- Wifi Widget Not available.
The configuration menu let you configure the data acquisition of the IMU with different parameters and see the space left on the SD Card.
- Sample Rate Widget : Rate at wich the IMU acquire data in Hz. By selecting it multiple time, you can change between 10,50,100,200 Hz.
- Gyroscope Range Widget : Range of the gyroscope. By selecting it multiple time, you can change between 250,500,1000,2000 dps.
- Accelerometer Range Widget : Range of the accelerometer. By selecting it multiple time, you can change between 2,4,8,16 g.
- SD Card Space Widget : Tells you the space left on the SD Card, 0gb if connected to external. No action when selected.
- Power : Turn the device On and Off.
- Up : Change between configuration menu and starting menu.
- Select : Perform the action of the widget selected.
- Previous and Next : Let you move between the widgets/pages available.
- System is shut down when the oled display is completely black and the led is no longer flashing. It is not consuming power.
- Make sure an SD card is present
- Go to the Logging Widget.
- Press Select Button to start logging.
- Press Select Button again to stop logging.
Logging state will toggle ON/OFF. A new folder with a .mdat file inside will be created in the SD card every time the logging process is started. Data is synchronized (flushed) at every second.
- The size of the file will depend on the sample rate of the IMU and how long the data acquisition is.
- Go to the SD Card Widget
- Press Select Button to Connect USB.
- Press Select Button to Disconnect USB.
- Turn Off the power switch.
The device will shutdown and display Shutdown Screen. No power is consumed in this mode.
- ~18h When no action is performed.
- ~13h When recording at 200hz.
- ~9h When WiFi is enable and no action is performed.
If not needed, consider disabling WiFi to save battery.
- ~1.44 Mb for 1h at 10Hz
- ~4.6 Mb for 1h at 50Hz
- ~13.2 Mb fot 1h at 100Hz
- ~26.1 Mb for 1h at 200Hz
- Connect the module to an USB port or charger. The module will charge in about 3h, depending on the residual charge of the battery. The Mini-Logger charges faster if powered down first since all the available power from USB is used to recharge the battery.
- The device will reset when connecting to the USB port on Windows.