Finger Detection

The ring uses the PPG sensor to detect the presence of a finger before enabling operation of the EDA electrodes. This is to prevent the EDA circuit being active and potentially have an external current applied and damaging the circuit. The ring will not stream EDA data without the presence of a finger in close proximity to the PPG window.

The ring’s LED will flash pink indicating that streaming has been disabled since there is no finger present.

Flashing Pink = No finger present

The bottom of the ring glows green when the PPG sensor is active and the ring's LED indicator is a solid pink when the EDA path is live and actively streaming data.

Green light = PPG sensor active

Pink LED = EDA path is live

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Participant Prep

Before putting the ring on a participant and starting a session, it is recommended they wash hands, dry well, and check that hands are not too cold from outdoor activities. Cold hands can affect the quality of the electrodermal activity signal.