Wrist-Mounted Device with Integrated Electronics

A method comprising:

• receiving, by a device that includes one or more processors, a first electrical signal from a first electrical contact disposed on an inner surface of a mount in the device, wherein the mount is configured to mount a housing of the device to a first external body surface, wherein the first external body surface is at a wrist location of a particular arm of a wearer, and wherein the first electrical contact is configured to contact skin at the first external body surface responsive to the housing being mounted to the first external body surface;
• receiving a second electrical signal from a second electrical contact disposed on an outer surface of the mount, wherein the second electrical contact is configured to be contacted by skin of a second external body surface, and wherein the second external body surface is at a location other than the particular arm;
• and
• providing an output indicative of a biological state of the wearer based on voltage fluctuations between the first electrical contact and the second electrical contact, wherein the voltage fluctuations are based on the first electrical signal and the second electrical signal.

A wrist-mounted device comprising:

• a housing for electronic components;
• a first strap coupled to a first side of the housing;
• a second strap coupled to a second side of the housing opposite to the first side, wherein the first strap is configured to couple with the second strap to mount the housing to a first external body surface, wherein the first external body surface is at a wrist location of a particular arm of a wearer;
• a first inner electrode disposed on an inner surface of the first strap, wherein the first inner electrode is configured to contact skin at the first external body surface responsive to the housing being mounted to the first external body surface;
• a second inner electrode disposed on an inner surface of the second strap, wherein the second inner electrode is configured to contact skin at the first external body surface that is a threshold distance from the skin contacted by the first inner electrode;
• a first outer electrode disposed on an outer surface of the first strap, wherein the first outer electrode is configured to be contacted by skin of a second external body surface, and wherein the second external body surface is at a location other than the particular arm;
• a second outer electrode disposed on an outer surface of the second strap, wherein the second outer electrode is configured to be contacted by skin of the second external body surface;
• and
• a signal conditioner disposed in the housing and configured to determine voltages of electrodes in the first and second straps, wherein the signal conditioner is configured to determine data indicative of a biological state of the wearer based on voltage fluctuations between at least two of the electrodes in the first and second straps.