Wearable sensor device
A wearable sensor device includes a temperature and humidity sensor that measures ambient environmental information around a living body, a snap button connected to a bioelectrode, a biological information measurement unit that measures biological information, an inertial sensor that measures inertial information, a calculation unit that calculates a biological feature amount based on the biological information and calculates an inertial feature amount based on the inertial information, and a wireless communication unit that transmits the biological information, the inertial information, the biological feature amount, the inertial feature amount, and the environmental information to the outside.
1 . A wearable sensor device comprising:
an environmental sensor configured to measure ambient environmental information around a living body;
a first conductive portion configured to be connected to a bioelectrode that is in contact with a body surface of the living body or to be in contact with the body surface of the living body;
a biological information measurement device configured to measure biological information via the first conductive portion;
an inertial sensor configured to measure inertial information of the living body;
a calculation device configured to calculate a biological feature amount based on the biological information and to calculate an inertial feature amount based on the inertial information; and
a wireless communication device configured to wirelessly transmit the biological information, the inertial information, the biological feature amount, the inertial feature amount, and the environmental information to an external device, wherein:
the biological information measurement device, the inertial sensor, the calculation device, and the wireless communication device are provided in a sealed housing;
the environmental sensor is provided on an outer wall surface of the sealed housing or is provided to be separated from the outer wall surface to outside the housing, the environmental sensor and the first conductive portion are provided on respective surfaces of the sealed housing that are orthogonal to each other; and
a part of the first conductive portion is exposed to outside of the sealed housing for connection to the bioelectrode or for contact with the body surface of the living body.
2 . The wearable sensor device according to claim 1 , wherein:
the wireless communication device is configured to store the biological information and the inertial information in a first packet and to transmit the first packet to the external device and to store the biological feature amount, the inertial feature amount, and the environmental information in a second packet and to transmit the second packet to the external device; and
a transmission interval of the second packet is longer than a transmission interval of the first packet.
3 . The wearable sensor device according to claim 1 , wherein:
a sampling interval of the inertial information is an integer multiple of two or more of sampling intervals of the biological information;
a sampling interval of the environmental information is an integer multiple of two or more of the sampling intervals of the inertial information; and
a data interval of at least a portion of the biological feature amount and at least a portion of the inertial feature amount is an integer multiple of one or more of the sampling intervals of the environmental information.
4 . The wearable sensor device according to claim 1 , further comprising a memory for storing information, wherein:
the calculation device is configured to store the biological information measured by the biological information measurement device in the memory and to calculate the biological feature amount at a period equal to a sampling interval of the inertial information.
5 . The wearable sensor device according to claim 1 , further comprising a memory for storing information, wherein:
the calculation device is configured to store the inertial information measured by the inertial sensor in the memory and to calculate the inertial feature amount at a period equal to a sampling interval of the environmental information.
6 . The wearable sensor device according to claim 1 , wherein:
the first conductive portion is detachably connectable to a second conductive portion provided on a wear worn on the living body and is electrically connected to the bioelectrode provided on the wear when connected mechanically and electrically to the second conductive portion.
7 . The wearable sensor device according to claim 1 , wherein:
the first conductive portion and the biological information measurement device are connected to each other via a first flexible wiring, and the environmental sensor and the calculation device are connected to each other via a second flexible wiring.
8 . A method comprising:
measuring, by an environmental sensor, ambient environmental information around a living body;
connecting a first conductive portion to a bioelectrode that is in contact with a body surface of the living body or to the body surface of the living body;
measuring, by a biological information measurement device, biological information via the first conductive portion;
measuring, by an inertial sensor, inertial information of the living body;
calculating, by a calculation device, a biological feature amount based on the biological information and calculating an inertial feature amount based on the inertial information; and
wirelessly transmitting, by a wireless communication device, the biological information, the inertial information, the biological feature amount, the inertial feature amount, and the environmental information to an external device, wherein:
the biological information measurement device, the inertial sensor, the calculation device, and the wireless communication device are provided in a sealed housing;
the environmental sensor is provided on an outer wall surface of the sealed housing or is provided to be separated from the outer wall surface to outside of the housing, the environmental sensor and the first conductive portion are provided on respective surfaces of the sealed housing that are orthogonal to each other; and
a part of the first conductive portion is exposed to outside of the sealed housing for connection to the bioelectrode or for contact with the body surface of the living body.
9 . The method according to claim 8 , further comprising:
storing, by the wireless communication device, the biological information and the inertial information in a first packet and transmitting the first packet to the external device; and
storing, by the wireless communication device, the biological feature amount, the inertial feature amount, and the environmental information in a second packet and transmitting the second packet to the external device, wherein a transmission interval of the second packet is longer than a transmission interval of the first packet.
10 . The method according to claim 8 , wherein:
a sampling intervals of the inertial information is an integer multiple of two or more of sampling intervals of the biological information;
a sampling interval of the environmental information is an integer multiple of two or more of the sampling intervals of the inertial information; and
a data interval of at least a portion of the biological feature amount and at least a portion of the inertial feature amount is an integer multiple of one or more of the sampling intervals of the environmental information.
11 . The method according to claim 8 , further comprising:
storing the biological information measured by the biological information measurement device in a memory; and
calculating the biological feature amount at a period equal to a sampling interval of the inertial information.
12 . The method according to claim 8 , further comprising:
storing the inertial information measured by the inertial sensor in a memory; and
calculating the inertial feature amount at a period equal to a sampling interval of the environmental information.
13 . The method according to claim 8 , wherein:
the first conductive portion is detachably connectable to a second conductive portion provided on a wear worn on the living body and is electrically connected to the bioelectrode provided on the wear when connected mechanically and electrically to the second conductive portion.
14 . The method according to claim 8 , wherein:
the first conductive portion and the biological information measurement device are connected to each other via a first flexible wiring, and the environmental sensor and the calculation device are connected to each other via a second flexible wiring.