Copyright © Shimmer 2017
Realtime Technologies Ltd Shimmer User Manual
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42
Note: The Shimmer unit should never be placed in the dock while the operation status LED’s indicate
that it is configuring as this may cause a file-system error. Once configuration has begun, you must
power off or reset the Shimmer unit before docking.
Note: It is not recommend to place the Shimmer3 unit in the dock while it is logging data as this can
cause SD card access problems. Once logging has begun, you must power off or reset the Shimmer3
unit before docking.
5.1.2. SDLog
SDLog Firmware is a firmware image which allows logging of data from a Shimmer to the on-board
SD card. The firmware allows full user configuration of the Shimmer via a configuration file, stored
on the SD card. Many useful features, such as time synchronisation among multiple Shimmer units,
start/stop logging on one or more devices by a single button press, and user-defined naming of
devices, are enabled by this firmware image.
SDLog Firmware is fully compatible with Consensys software. SDLog Firmware can be used with a
Shimmer3 device with a microSD card, with capacity up to 32Gbytes. For Shimmer compatibility the
microSD card chosen must implement 1-bit SPI mode. The Shimmer3 is shipped with a compatible
microSD card.
A Shimmer Dock or Consensys Base is required to allow access the SD card on the Shimmer from the
PC for configuration of logging preferences and data transfer. Please note that legacy (black)
Shimmer docks are not suitable for this purpose and a newer (white) dock is required.
Using the firmware
To use the SDLog Firmware, the user must provide the desired configuration parameters of each
Shimmer. The configuration parameters are saved in a configuration file, named sdlog.cfg, from
which they will be loaded by the Shimmer at initialisation. The configuration file is read every time a
new logging session is started on the Shimmer. To change the configuration, modify the sdlog.cfg file
and reboot the Shimmer (there is no need to reprogram). The configuration file allows configuration
of all firmware features, including which sensors are enabled, sampling rate, sensor sensitivity
parameters and synchronisation options.
It is recommended to use the Consensys software to avoid errors in writing the configuration file.
However, it can be written in any text editor and saved to the SD card without the software
application; refer to the SDLog for Shimmer3 Firmware User Manual for further details. Consensys is
available in the Shimmer User Resources distribution as well as for download from the Shimmer
website (http://www.shimmersensing.com).
SDLog firmware LED Indicators
The Shimmer3 has five LEDs in two locations: lower location A (green, yellow and red); upper
location B (green , blue), as shown in Figure 2-1.
The LEDs in Location A are used to indicate battery charge status, as outlined in Table 5-3.
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