I'm here 'cause i'm taking a part in a project using the Bitalino's EDA sensor.
The purpose of this project is the mesurement of the skin's EDA and show it on an LCD screen.
For that matter, i'm using an Arduino Leonardo ETH, linked with the sensor. The main Bitalino device is not used.
I've 3 questions :
1) In a multiple topics found in this site ( http://forum.bitalino.com/viewtopic.php?f=12&t=100 ; http://forum.bitalino.com/viewtopic.php?t=98 ), i've found that the "Ref" pin should linked with the Arduino, using a couple of resistors (100kOhm each). I'm asking why should i have to use these 2 resistors ? Why the resistors' value have to be 100kOhm ?
2) I'm using (without knowing why) the electrical assembly i've told before. Using the formula on the datasheet, i've found the EDA value = 1/(1-(eda_out/2^n)). What is the average mesure that an human should have ? What is the standard ? In the "Fig. 2. Typical raw EDA data (acquired with BITalino)" in the EDA's sensor datasheet (link here http://bitalino.com/datasheets/EDA_Sensor_Datasheet.pdf ), we can see the mean value around 6 uS, is that correct ?
3) What are the uncertainty of the measurement ? What is the percentage/proportion of validity or reliability ? (I don't know how to say that in english, I hope to be understood )
A pic of the circuit is available at the attachements section.
Thanks for your help,