V4

Major changes are:

• Better Battery Access & Storage: by taking away the bottom coverage slightly, users can more easily (dis-) connect a battery for charging.
• Sturdier Body: By improving tolerances, wall thickness and locking mechanisms, the cover is now much stronger.
• Better Usability with Baseball Caps: Through a re-design of the bottom clip, the system can now be used with baseball caps and headbands more easily and reliably.

V3

Major changes are:

• Better Connector Placement: reducing the distance to the ears and thereby reducing tension on the electrode cables for some participants with larger head sizes.
• Better Cable Storage: By routing the connector cables inside of the enclosure, artefacts from cable contacts are eliminated, and the overall footprint of the system is reduced.
• Fewer Components: Through a re-design of the 3D printed components, only two parts need to be printed now (the Cyton+Daisy board cover).
• Added an exemplary biofeedback application for bruxism detection (from Knierim et al. 2022 - HardwareX).

V2

Major changes are:

• New, single row connector PCB (facilitates mapping of channels)
• Re-designed the adapter holder to be usable with Ultracortex headset and more flexible with different head sizes

V1

Initial release of the adapter version that is published with this article: https://www.tandfonline.com/doi/full/10.1080/2326263X.2021.1972633