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The block diagram of the designed system-on-chip (SoC) sensing platform with a replaceable sensor card.
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A self-sustained multi-sensor platform for indoor environmental monitoring is proposed in this paper. To reduce the cost and power consumption of the sensing platform, in the developed platform, organic materials of PEDOT:PSS and PEDOT:PSS/EB-PANI are used as the sensing films for humidity and CO2 detection, respectively. Different from traditional...
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... average power generation of the DSSC is around 1.2 mW under a typical indoor office lighting condition with 400 lux luminance level. The block diagram of the SoC as shown in Figure 2 is designed to collect environmental (temperature, CO 2 and humidity) information under a stringent power budget. The SoC includes a power management unit (PMU), analog-front-end (AFE), an analog-to-digital converter (ADC), a digital control unit, a bandgap reference circuit and several low drop-out voltage regulators (LDO). ...
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... charger in the PMU transfers energies scavenged from the DSSC module to a Li-ion rechargeable battery. The schematic of the proposed PMU shown in Figure S2. The schematic of the charger circuit is shown in Figure S3 includes stabilize and charging sub-circuits. ...
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... such a power-gating scheme, the average power consumption in operation is reduced significantly The charger in the PMU transfers energies scavenged from the DSSC module to a Li-ion rechargeable battery. The schematic of the proposed PMU shown in Figure S2. The schematic of the charger circuit is shown in Figure S3 includes stabilize and charging sub-circuits. ...
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... impedances of the developed organic sensors indicate humidity levels and CO2 concentrations. The impedance variations are converted into voltages by using a resistive voltage divider as shown in Figure 2. The sensed voltages are amplified by using a non-inverting amplifier ...
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... impedances of the developed organic sensors indicate humidity levels and CO 2 concentrations. The impedance variations are converted into voltages by using a resistive voltage divider as shown in Figure 2. The sensed voltages are amplified by using a non-inverting amplifier configuration in the AFE block. ...
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... measurement results from the developed sensing platform. Figure S2. Block diagram of the proposed power management unit. ...
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... In comparison with conventional gas sensors, the combination of printed PEDOT:PSS and PEDOT:PSS/emeraldine base-polyaniline (EB-PANI) films effectively reduced the power consumption of a combinatorial sensor due to their ability to simultaneously monitor humidity and carbon dioxide (CO 2 ) level at room temperature. [181] ...
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The Internet of Things (IoT) has inspired key directions for next-generation sensor development. These directions include low power and good selectivity to promote IoT applications. To address this point, in this work, we developed a low-power and room-temperature-operation CO
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sensing material with high selectivity to humidity. The sensing material was developed based on (emeraldine-based polyaniline)/(poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) composites, i.e. EB-PANI/PEDOT:PSS. Its selectivity to humidity was experimentally verified from 55% RH to 85% RH. In brief, the sharing of PSS between PEDOT and EB-PANI improved the conductivity and CO
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sensing characteristics of the composite sensing material. At the same time, the opposite humidity-sensing responses of PEDOT and PANI counteracted to each other and resulted in a high selectivity to humidity. In this work, the optimal weight ratio of an EB-PANI/PEDOT:PSS sensing film for CO
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monitoring and immunity to humidity interference was also discussed. To demonstrate the feasibility of integrating the developed sensing material into an IoT system, a self-sustained system-on-chip (SoC) platform for expiration CO
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detection was implemented and experimentally operated with indoor illuminance conditions.
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