Abstract: In a sensor used in an energy harvesting system, electric power generated by a solar cell module is more efficiently utilized. In a sensor (100), a resistor (3) is connected in parallel with one of a first solar cell module (1a) and a second solar cell module (1b) that have mutually different current-voltage characteristics in the same illuminance environment and in series with the other one of the first solar cell module (1a) and the second solar cell module (1b). A first voltmeter (4a) measures a voltage (V1) across the first solar cell module (1a), and a second voltmeter (4b) measures a voltage (V2) across the second solar cell module (1b). A load (6) is fed with the electric power generated by the first solar cell module (1a) and the second solar cell module (1b).

Abstract: The present disclosure provides technology of setting the reception period of a repeater or the transmission period of a transmitter. The present disclosure provides a method of setting the reception period of a repeater 100 including a battery 120 and configured to receive radio waves transmitted by at least one transmitter 200, the method including setting the reception period of the repeater 100 based on a power consumption Pk (Wh) of the at least one transmitter 200 and a power consumption Pc (Wh) of the repeater 100.