An autonomous multisensor system powered by an energy harvester fabricated with a flat-panel solar thermoelectric generator ultralow-power management circuit is presented. The was tested in agricultural application, where every 15 min the values of temperature, air humidity, and radiation have to be measured stored mass memory device (a Secure Digital card), their respective time stamp. energy-harvesting switching dc-dc converter based on low-input-voltage commercial integrated (LTC3108),...

We present here the design and fabrication of a self-powered autonomous fringing field capacitive sensor to measure soil water content. The is manufactured using conventional printed circuit board includes porous ceramic. To read sensor, we use that 10 kHz triangle wave generator, an AC amplifier, precision rectifier microcontroller. In terms performance, sensor's capacitance (measured in laboratory prototype) increases up 5% when volumetric content ceramic changed from 3% 36%, resulting...

The conflict between environmental conservation and agricultural production highlights the need for precise land use cover (LULC) mapping to support agro-environmental-related policies. Satellite image time series from Moderate Resolution Image Spectroradiometer (MODIS) sensor are essential current LULC efforts. However, most approaches focus on pixel data, studies exploring object-based spatiotemporal heterogeneity correlation features in its limited. objective of this study is mix data...

In the current era of agricultural management practices, known as 5.0, optimal indoor environments are associated with comfortable temperatures, regulated humidity, and good air quality—essential variables to improve yields. Given this scenario, there is a need for innovative ecosystems that automate environmental monitoring in an affordable scalable way. This paper presents scope development validation IoT-based ecosystem designed monitor control conditions barns. The objective present...

Heat dissipation sensors operate based on the temperature dependence of transient heat conduction within soil, which is a function soil characteristics and its water content. After pulse with controlled energy applied to heater, it possible show that maximum rise AT <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">M</sub> measured in sensing element can be related volumetric content θ xmlns:xlink="http://www.w3.org/1999/xlink">v</sub> [m <sup...

Solar radiation and human activity generate ubiquitous temperature gradients that could be harvested by thermoelectric generators (TEGs). However, most of these are in the range very few degrees and, while TEGs able to harvest them, resulting output voltages extremely small (a hundreds mV), DC–DC converters necessary boost them usable levels. Impedance matching between converter plays a fundamental role energy harvesting efficiency. Therefore, it is essential determine power system different...

Laying hens are affected by the intensity, wavelength, and duration of light, behavioral patterns these animals important indicators stress. The objective present study was to evaluate cluster unrest behaviors lying submitted three environments with different treatments monochromatic lighting (blue, green, red). For 29 weeks, 60 laying from Lohmann variety were divided into groups monitored surveillance cameras installed on each shed ceiling directed floor. Each group housed in a small-scale...

We present a capacitive smart sensor based on printed circuit board (PCB) technology to measure the amount of water content in paper pulp at wet end machine. The developed incorporates same PCB signal processing circuits. It is handheld portable device, and its output sent reading equipment using Bluetooth wireless connection, providing sensor’s operator ease mobility around prototype was tested laboratory, wire mesh emulate machine, we were able easily detect when it reaches range 90% 92%,...

Predictive maintenance systems for industrial electric motors are being developed using electronic sensors and wireless communication incorporated into ultra-low consumption circuits. If the circuit is consumption, a simple low-capacity rechargeable battery can power system years. However, use of batteries on large scale contributes to environmental pollution. To eliminate batteries, several energy harvesting techniques used make self-sustaining. In this sense, paper presents development an...

Reducing energy consumption is mandatory in self-powered sensor nodes of wireless networks that obtain all their from the environment. In this direction, one first step to optimize network accurately measure total harvested, which will determine power available for consumption. We present here a technique based on an embedded circuit with ultra-low-power microcontroller efficiency flat-panel solar thermoelectric generators operating environmental temperature gradients. Experimental tests...

We propose an autonomous energy wireless sensor node for monitoring rotation machines condition. The thermal dissipated during normal operation of the motor can be harvested to power ultra low sensor. is stored in supercapacitors instead lithium-ion battery, providing extended life storage element and being able handle high radio transmission pulses. proposed system may used on early fault diagnosis through pervasive data collection collected provide a maintenance schedule programming with...

A technique to eliminate the offset drift in demodulator circuitry of open-loop interferometric fiber optic gyroscopes is presented. This employs a demodulation scheme that uses area negative half-cycles output signal sinusoidally modulated gyroscope obtain angular velocity. We propose an electronic periodically reverses input, allowing for acquisition two samples with same magnitude and opposite polarities. The velocity obtained from subtraction these samples, suppressing offset....

We present an autonomous sensor to measure soil water content that uses a single heat pulse probe based on transistor encapsulated in porous block. The bipolar junction transistor, which performs as both heating and temperature-sensing element. Since the depends block matric potential of soil, it does not suffer from accuracy problems if contact between is perfect. A prototype showed temperature variation Δ T = 2.9 ∘ C when ceramic was saturated with water. presented almost linear behavior...

O setor de manutenção frota representa grande parte dos custos nas propriedades agroindustriais e toda a inovação tecnologia empregada na redução destes impacta diretamente no preço final do produto. Diante desse contexto, o objetivo artigo é identificar como está configurado estado conhecimento sobre as ferramentas preditiva para motores diesel. Para atender objetivo, foi utilizada uma revisão bibliográfica sistemática, composta por três fases: Entrada, Processamento Saída. Foi possível um...

A temperature‐stable heat pulse driver for low‐voltage single supply soil moisture sensors based on junction transistors is presented. The temperature drift of the pulse, caused by variations d V BE /d T in placed feedback loop, fully compensated for. circuit measures loop and generates a current which proportional to − (1/ R 0) that, when passed through another resistor inside ( 1 = 0 ), provides full compensation. topology also an output voltage (the used define pulse) does not need be...

Esta revisão sistemática tem como objetivo estudar a alimentação das larvas da mosca soldado negro (BSF) por meio de 44 artigos acadêmicos selecionados várias bases dados. A pesquisa foi realizada usando uma String bem definida para limitar o escopo do estudo. As informações extraídas desses foram organizadas em categorias, incluindo objetivos, métodos, resultados e autoria, uso software StArt facilitou extração eficiente dados relevantes. com identificar gerenciamento resíduos alimentares...

We present the design and fabrication of a reconfigurable smart-sensor for measuring moisture content (MC) temperature in grains stored silos, using capacitance fringing field interdigitated sensor resistance detector (RTD), both implemented on single conventional printed circuit board. The was tested laboratory, corn kernels with percent MC range <inline-formula> <tex-math notation="LaTeX">$= 8\%$ </tex-math></inline-formula> to 32 \%$ and, simple relaxation oscillator frequency-to-voltage...

A low-cost signal processing circuit developed to measure and drive a heat dissipation soil matric potential sensor based on single thermosensitive resistor is demonstrated. The SnSe2 has high thermal coefficient, from −2.4Ω/°C in the 20 25 °C −1.07Ω/°C °C. encapsulated with porous gypsum block used as both heating temperature sensing element. To control power dissipated keep it constant during pulse, mixed analogue/digital used. able maintain at 327.98±0.3% mW when changes 94.96Ω 86.23Ω....

Systematic Literature Review (SLR) is a means to synthesize relevant and high quality studies related specific topic or research questions. In general, SLR has three phases, the first one Primary Selection in which selection of usually performed manually reading title, abstract keywords each study. The number published scientific grown, increasing effort carrying out this review. paper, we proposed two strategies rank decreasing order importance, for SLR, regarding terms search string. These...

Abstract In its iron ore operations, Vale, the largest mining company in Brazil and fourth world by market value, has 77 dams considered with high potential damage case of a failure stability controls. This classification follows criteria sector regulatory agency determines that, for this class, mass alert system is necessary resident population workers immediately downstream dam within region preset legislation, considering simulated flood area. For emergencies part critical mitigating...