Magnetic detachable electrical connections between circuits

A system comprising:

• a first device comprising:
• a first substrate;
• at least one first electric component on or at least partially in a first surface of the first substrate;
• a plurality of first contact pads electrically coupled to one or more electric components of the at least one first electric component, the plurality of first contact pads on or at least partially in a second surface of the first substrate, the first surface opposite the second surface;
• and
• a plurality of first conductive magnets external to the first substrate and electrically and mechanically connected to respective first contact pads of the plurality of first contact pads through a first conductive adhesive, wherein adjacent magnets of the plurality of first conductive magnets are polarized in opposite directions;
• and
• a second device comprising:
• a second substrate;
• at least one second electric component on or at least partially in a first surface of the second substrate;
• a plurality of second contact pads electrically coupled to one or more electric components of the at least one second electric component, the plurality of second contact pads on or at least partially in a second surface of the second substrate, the first surface opposite the second surface;
• and
• a plurality of second conductive magnets external to the second substrate and electrically and mechanically connected to respective second contact pads of the plurality of second contact pads through a second conductive adhesive, the plurality of second conductive magnets including a first polarity same as a respective first conductive magnet of the plurality of first conductive magnets such that when placed in proximity, the respective first conductive magnet and the second conductive magnet form an electrical and mechanical connection on a side perpendicular to a surface of the plurality of second contact pads, wherein adjacent magnets of the plurality of second conductive magnets are polarized in opposite directions.

A system comprising:

• a first device comprising:
• a first substrate;
• at least one first electric component on or at least partially in a first surface of the first substrate, the first electric component configured to produce signals indicative of a biological parameter of a user wearing the system;
• an adhesive on the first surface of the first substrate to temporarily attach the first device to skin of the user;
• first electrical interconnect circuitry electrically connected to the at least one first electric component, the first electrical interconnect circuitry including conductive material in the first substrate;
• a plurality of first contact pads electrically connected to one or more electric components of the at least one first electric component through the first electrical interconnect circuitry, the plurality of first contact pads on or at least partially in a second surface of the first substrate, the first surface opposite the second surface;
• and
• a plurality of first conductive magnets electrically and mechanically connected to respective first contact pads of the plurality of first contact pads through a first conductive adhesive, wherein adjacent magnets of the plurality of first conductive magnets are polarized in opposite directions;
• and
• a second device comprising:
• a second substrate;
• at least one second electric component on or at least partially in a first surface of the second substrate;
• second electrical interconnect circuitry electrically connected to the at least one second electric component, the second electrical interconnect circuitry including conductive material in the second substrate;
• a plurality of second contact pads electrically connected to one or more electric components of the at least one second electric component through the second electrical interconnect circuitry, the plurality of second contact pads on or at least partially in a second surface of the second substrate, the first surface opposite the second surface;
• and
• a plurality of second conductive magnets electrically and mechanically connected to respective second contact pads through a second conductive adhesive, wherein adjacent magnets of the plurality of second conductive magnets are polarized in opposite directions, the plurality of second conductive magnets including a first polarity opposite respective first conductive magnets of the plurality of first conductive magnets such that when placed in proximity, the respective first conductive magnets and the second conductive magnets form an electrical and mechanical connection.