Abstract: A sensor device includes: a sensor that detects environment information; a battery that supplies electric power to the sensor device; and a connector that detachably attaches to an auxiliary battery for supplying electric power to the sensor device. The sensor device transmits the detected environment information to another sensor device, and when the auxiliary battery is not attached, the sensor device operates with electric power supply from the battery, and when the auxiliary battery is attached, the sensor device operates with electric power supply from either the battery or the auxiliary battery.

Abstract: A sensor node of the invention includes: a first to nth (n is an integer equal to or greater than two) environmental sensors which are configured to acquire ambient environmental information; a transmitter that is configured to regularly issue ambient environmental information acquired by at least one of the second to nth environmental sensors at a predetermined cycle and is configured to irregularly issue ambient environmental information acquired by the first environmental sensor and ambient environmental information acquired by at least one of the second to nth environmental sensors; a detector that is configured to detect a change value of ambient environmental information acquired by the first environmental sensor greater than a first threshold value; and a transmission interval controller that is configured to control a timing at which the transmitter regularly and irregularly issues the ambient environmental information.

Abstract: A sensor node of the invention includes: a first to nth (n is an integer equal to or greater than two) environmental sensors which are configured to acquire ambient environmental information; a transmitter that is configured to regularly issue ambient environmental information acquired by at least one of the second to nth environmental sensors at a predetermined cycle and is configured to irregularly issue ambient environmental information acquired by the first environmental sensor and ambient environmental information acquired by at least one of the second to nth environmental sensors; a detector that is configured to detect a change value of ambient environmental information acquired by the first environmental sensor greater than a first threshold value; and a transmission interval controller that is configured to control a timing at which the transmitter regularly and irregularly issues the ambient environmental information.

Abstract: A sensor node includes a power generator, a power storage, a transmitter having an environment sensor, a transmission controller, and a transmission unit, a first switcher provided between the transmission controller and the power storage, and a second switcher provided between the transmission unit and the power storage. In a case where the storage capacity of the power storage decreases to a first threshold or less and then the storage capacity increases, when the storage capacity reaches the first threshold, the first switcher is brought into an on-state and the first switcher supplies electric power to the transmission controller. When the storage capacity reaches a second threshold higher than the first threshold, the second switcher is brought into an on-state and the second switcher supplies electric power to the transmission unit.

Abstract: A sensor node includes a power generator, a power storage, a transmitter having an environment sensor, a transmission controller, and a transmission unit, a first switcher provided between the transmission controller and the power storage, and a second switcher provided between the transmission unit and the power storage. In a case where the storage capacity of the power storage decreases to a first threshold or less and then the storage capacity increases, when the storage capacity reaches the first threshold, the first switcher is brought into an on-state and the first switcher supplies electric power to the transmission controller. When the storage capacity reaches a second threshold higher than the first threshold, the second switcher is brought into an on-state and the second switcher supplies electric power to the transmission unit.