Electrodermal Activity (EDA)
User Manual
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1.
General Information
1.1.
General Description
The
BITalino
EDA sensor is capable of accurately measuring the electrical properties of the skin which
changes. These changes are caused by alterations in sweat secretion and sweat gland activity as a
result of changing sympathetic nervous system activity. The low-noise signal conditioning and
amplification circuit design provide optimal performance in the detection of even the most feeble
electrodermal skin response events
Together with our available
our
software, one can easily extract
overall statistics, basic spectral analysis, and extract typical event-related phasic features from the
acquired sensor data.
Figure 1: BITalino EDA sensor (standard version).
1.2.
Typical Unfiltered Sensor Output
Figure 2 shows a typical unfiltered EDA sensor output acquired while being in a relaxed state. The raw
digital sensor values received from the BITalino device ranged between 0 and 2
n
-1 (n=sampling
resolution) were converted into the original unit of measurement of this sensor (
µ𝑆
) using the transfer
function found in section Transfer Function (Conversion Formula).
Figure 2: Typical unfiltered sensor output (while being in a relaxed state).
1.3.
Sensor Specifications
> Bandwidth:
0-2.8Hz
> Range:
0-25
µ𝑆
(@VCC = 3.3V)
> Input Voltage Range:
> Measurement:
1.8-5.5V
continuous
> Consumption:
> Current:
±0.1mA
DC
