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TitleOn-chip integrated silicon bulk-micromachined soil moisture sensor with electronics and bus interface
Author(s)Valente, A.
Correia, J. H.
Couto, Carlos
KeywordsSoil moisture sensor
Bus interface
Issue date4-Dec-2000
CitationIEEE INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS, 2000, Puebla, Mexico – “ISIE'2000 : proceedings”. Piscataway : Institute of Electrical and Electronics Engineers, 2000. ISBN 0-7803-6606-9. vol.1. p. 576-579.
Abstract(s)This paper presents an on-chip silicon bulkmicromachined Soil Moisture Sensor (SMS) for irrigation control in greenhouses. The system-on-a-chip includes the SMS, readout electronics, self-test, calibration facilities and a digital bus interface for external data transmission. Moreover, this low-cost device can be applied in several locations (e. g. per each plant root), and networked together with the 1-wire bus. The heat-pulse technique is used (for measuring the maximum temperature on a distant point) to determine the volumetric heat capacity and hence the water content of a porous media, such as soil. In order to validate this method, experimental results were achieved with a macrosensor based on the heat-pulse and capacitance methods. The capacitance method relates the volumetric water content with the capacitance change (dielectric properties) of a probe, inserted in the soil. Several tests were performed for different type of soils and water contents. These results are compared with the measurements achieved using the conventional thermogravimetric method.
TypeConference paper
AccessOpen access
Appears in Collections:DEI - Artigos em atas de congressos internacionais

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