Configuring A Shimmer Gsr+ Expansion Board - Shimmer ShimmerCapture User Manual

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state. In both cases, ShimmerCapture will attempt to send the configuration information to the
Shimmer3 Infomem (i.e., a region of EEPROM memory in the Shimmer's microcontroller).
It is important to note that, on power-cycle or device reset, the LogAndStream firmware will attempt
to load the last configuration parameters saved to the Infomem. Failing this scenario, default
configuration values will be loaded. For more detailed information on the operation the
configuration file and Infomem , consult the LogAndStream Firmware User Manual.
Undocked
When the Shimmer3 is undocked, the configuration parameters are sent from the ShimmerCapture
application to the Shimmer3 where the firmware will automatically store the settings in Infomem. It
will also attempt to create (or overwrite) the configuration file on the microSD card.
Docked
In the docked state, as before, the Shimmer3 will save the configuration parameters to the Infomem.
Once undocked the firmware will attempt to create (or overwrite) the configuration file on the
microSD card
Note: A Shimmer3 programmed with LogAndStream firmware should not be configured
while it is placed on a Shimmer Multi Charger. In this state, the Shimmer3 thinks that it is
connected to a Shimmer Dock and will surrender control of the microSD card. The settings
will not be written to the configuration file and on next power-cycle or device reset, the
settings in Infomem will be overwritten with old configuration parameters.
Note: It is not recommended to dock the Shimmer unit while it is being configured or logging
data. The Shimmer unit should either be powered off or in standby mode whenever it is
docked.

2.4. Configuring a Shimmer GSR+ Expansion Board

An external sensor option for the Shimmer3 is the Shimmer GSR+ Expansion Board. Among other
capabilities, this can be used to interface a PPG (Photoplethysmography) sensor to a Shimmer3
device. To use PPG, the following must be enabled

Int ADC A13 - The output of the sensor connected to the GSR+ Expansion Board is measured
by the internal ADC A13

Internal Exp Power (to power the external sensor e.g. PPG)
PPG data output will be under the category 'Internal ADC A13'. For further functionality information
of the GSR+ Expansion Board, users are encouraged to read the GSR+ Expansion Board User Guide.
When using PPG users can use the PPG to HR algorithm to convert the PPG signal into Heart Rate
(BPM). Snapshot of the dialog box within the configuration panel is as shown:-
ShimmerCapture User Manual
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