Capturing the measurement data – Data formats available

The Moodmetric smart ring measures in the same way continuously, around the clock. The data can be followed in real time on a smartphone screen. The ring also stores the data, so the phone does not need to be near the user at all times. The user downloads the measurement data from the ring to the app twice a day.

The data is available in different formats, also as raw data. It is to be noted that the Moodmetric smart ring is developed for field research and collecting and analyzing raw data requires the researcher to have experience of measuring electrodermal activity in laboratory conditions.

Numerical data can be collected in five standard ways. In addition the signal can be for instance screen captured, which might be useful in some settings.

1. Cloud service reports

Recommended way to collect data in field research is to obtain data from the Moodmetric cloud in CSV or Excel format.  When the ring is worn, it measures continuously and the data is first stored into the ring memory. When the Moodmetric smartphone app is opened and the user navigates to Day view, the data is downloaded from the ring to the app. If the Moodmetric cloud connection is enabled, the data is uploaded to the cloud automatically every couple of hours. Sample rate of one sample per minute is stored in the Moodmetric cloud.

MM level: an integer calculated from the raw signal
SCR/min: Activations / skin reactions per minute. This integer typically variates between 0..20 with a normal rate of ~3-4. 
SCL:  Refers to the raw level of skin conductance. The unit is micro siemens (µS) and the value typically varies from 0.2 to 20 µS.
Step count:
UNIX: Time in seconds starting from date 01.01.1970.
ISO: The International Organization for Standardization (ISO) date format.

2. Moodmetric API

The API description and credentials are available upon request. Moodmetric API enables viewing of the data in the Moodmetric cloud through an external platform.

3. Moodmetric SDK (Software Developer Kit)

Makes the Moodmetric real-time data available for mobile applications. The SDK is available for free download.

The SKD provides you with the following data:

  • Instant indicator is a fast indicator to see how a person reacts to different stimuli.
  • The MM Level
  • Acceleration: Data of 3-axis accelerometer inside the ring.
  • Raw skin resistance is provided without smoothing or artefact rejection.

4. PC Scope and Mobile Scope

Moodmetric Scope is a tool to capture raw data. The Moodmetric smart ring does not store raw data, but it can be streamed from the ring to a Windows PC via a dongle or to a mobile phone. Sample rate is 3 samples / second.

PC Scope

PC Scope enables recording the Moodmetric measurement data on a PC. The setting requires the measured persons to be close to the PC. It is also adviced to minimize signal noise of the surroundings.

Benefits of PC Scope:

  • Data is immediately available at a PC
  • Incoming data is simple to modify already during the measurement
  • Possibility to add markers, time stamps or data from other devices to the same file

Mobile Scope

Mobile Scope enables storing of raw data in many kinds of surroundings.

Benefits of Mobile Scope:

  • Mobile
  • Reliable connection also when the environment is not completely noise free
  • More data points recorded, than with PC Scope

PC Scope and Mobile Scope work best in short measurements from 1 to 60 minutes.

Mobile Scope – Values stored

Timestamp
MM level
Instant indicator (fast indicator to see how a person reacts to different stimuli)
Acceleration: (x,y,z) components as: sqrt(x^2 + y^2 + z^2). Possible also to get components one by one.
MM Level
SCR (skin reactions per minute)
Raw conductance

Status

Status bits State if 1 Notes
0MM not ready After put onto finger, or with bad skin contact
1Ring on finger Tells if the ring is on finger
2Battery is out Ring will stop sending
3Any reaction Peak detector for instant indicator
4Strong reactionStrong peak detector for instant indicator
5MM notification MM elevated for 5 min
6Relax notification MM low for 5 min

PC and Mobile Scope area available with the same licence. The licence includes access to download files of PC Scope and an Apk file that allows to download Mobile Scope to an Android smartphone.

When does the calibration time need to be considered

In general, a 12h calibration time should be allowed always, when collecting MM level data. The MM level is calculated using individual limits that are only defined after wearing the ring.

More exactly regarding raw data capturing:

  • Instant indicator – no need for calibration time
  • Reactions per minute – no need for calibration time
  • Raw conductance – no need for calibration time
  • Acceleration x, y, z – no need for calibration time
  • Raw MM – no need for calibration time
  • MM level – YES, calibration time needed
  • aa – YES, calibration time needed

Pricing: 
725€ / 10 pcs of Mobile Scope downloads. Single licence: 95€ (prices are exclusive of VAT)

Ask more: info@moodmetric.com