CN210427430U - Energy self-supply wireless alarm device based on humidity triggering - Google Patents
Energy self-supply wireless alarm device based on humidity triggering Download PDFInfo
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- CN210427430U CN210427430U CN201920032371.6U CN201920032371U CN210427430U CN 210427430 U CN210427430 U CN 210427430U CN 201920032371 U CN201920032371 U CN 201920032371U CN 210427430 U CN210427430 U CN 210427430U
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Abstract
A humidity-triggered energy self-powered wireless warning device comprising: the stacked electrode capable of forming a primary battery, a power management circuit, a power storage device, a voltage sampling device, a single chip microcomputer and a sensor information acquisition unit; the positive electrode and the negative electrode of the laminated electrode are respectively connected with two ends of a power management circuit, an electric quantity storage device is connected with the power management circuit in parallel, two ends of the electric quantity storage device are also connected with the single chip microcomputer, one end of a voltage sampling device is connected with one end of the electric quantity storage device, the other end of the voltage sampling device is connected with the single chip microcomputer, and the single chip microcomputer is also connected with a sensor information acquisition unit; secondly, the application scope is wide, need not to consider to change the power, and the adaptation occasion is more.
Description
Technical Field
The invention relates to a humidity-triggering-based energy self-supply wireless alarm device which solves the power supply problem of the alarm device in a special environment, reduces the volume of the wireless alarm device and prolongs the service life of the wireless alarm device.
Background
As known by physics, the capacitance type humidity alarm is characterized in that if the edge effect is ignored, the capacitance of a capacitor consisting of two parallel metal plates is different in dielectric constant of various media, and if other media except air are filled between the two electrodes, the dielectric constant is changed, and the capacitance is changed accordingly.
The existing humidity detection alarm device needs a battery or an external power supply for power supply and comprises a power supply indicating circuit, a sampling circuit and an alarm indicating circuit, wherein the power supply indicating circuit is formed by connecting a light emitting diode LED1 and a resistor R9 in series and then connecting the light emitting diode LED1 and a capacitor C in parallel, the sampling circuit is formed by connecting a humidity sensitive resistor W1 and a resistor R3 in series, an integrated circuit ICA is connected with resistors R1 and R2 to form a same-phase amplifier, and an integrated circuit ICB is connected with resistors R4, R5, R6 and a potentiometer W2 to form a voltage comparison amplifier.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a humidity-triggering-based energy self-supply wireless alarm device which solves the power supply problem of an alarm device in a special environment, reduces the volume of the wireless alarm device and prolongs the service life of the wireless alarm device.
In order to achieve the purpose, the invention adopts the following technical scheme: a humidity-triggered energy self-powered wireless warning device comprising: the device comprises a laminated electrode, a power management circuit, a power storage device, a voltage sampling device, a single chip microcomputer and a sensor information acquisition unit; the stacked electrode is formed by alternately arranging two conductive materials with different electric potentials, the positive electrode and the negative electrode of the stacked electrode are respectively connected with two ends of a power management circuit, an electric quantity storage device is connected with the power management circuit in parallel, two ends of the electric quantity storage device are also connected with a single chip microcomputer, one end of a voltage sampling device is connected to one end of the electric quantity storage device, the other end of the voltage sampling device is connected to the single chip microcomputer, and a sensor information acquisition unit is also connected to the single chip microcomputer.
Furthermore, the laminated electrode is formed by connecting a plurality of electrode anodes and electrode cathodes in series or in parallel.
Further, the charge storage device is a capacitor C2 and the voltage sampling device is a resistor R3.
Further, the power management circuit includes: the power supply comprises a booster circuit, a rectifying and filtering circuit and a power supply switch circuit; the booster circuit includes: the circuit comprises a resistor R1, a transformer T1 and a triode Q1; the rectifying and filtering circuit includes: diode D1, capacitor C1; the power switching circuit includes: diode D2, resistance R2, MOS pipe Q3 and triode Q2.
Furthermore, the input end of the transformer T1 is connected with the positive electrode, one end of the output end of the transformer T1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the base of the triode Q1, the output end of the transformer T1 is also connected with the collector of the triode Q1 and the positive electrode of the diode D1, and the emitter of the triode Q1 is connected with the negative electrode; the cathode of the diode D1 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is connected with the cathode of the electrode; one end of the capacitor C1 is also connected with the cathode of the diode D2 and the drain of the MOS transistor Q3, the anode of the diode D2 is connected with one end of the resistor R2 and the base of the triode Q2, and the other end of the resistor R2 is connected with the cathode of the emitter of the triode Q2; the collector of the triode Q2 is connected with the grid of the MOS tube Q3; the source electrode of the MOS transistor Q3 is connected with one end of a capacitor C2 and one end of a resistor R3, and the other end of the resistor R3 is connected with the single chip microcomputer; the other end of the capacitor C2 is connected with the negative electrode of the electrode.
Furthermore, the singlechip is also connected with a signal transmitting and receiving antenna.
Further, the power management circuit is packaged in the waterproof shell and connected with the first electrode metal contact and the first information acquisition metal contact which are positioned at the bottom of the waterproof shell; a second electrode metal contact corresponding to the first electrode metal contact and a second information acquisition metal contact corresponding to the first information acquisition metal contact are arranged at the upper end of the water permeable shell, and a laminated electrode is arranged in the water permeable shell; the laminated electrode is connected with the second electrode metal contact and connected with the first electrode metal contact through the second electrode metal contact and the power management circuit, the sensor information acquisition unit is further arranged in the water permeable shell and connected with the second information acquisition metal contact, and the second information acquisition metal contact is connected with the first information acquisition metal contact and the power management circuit.
Furthermore, an electric quantity storage device, a voltage sampling device and a single chip microcomputer are connected between the power management circuit and the first information acquisition metal contact, and the electric quantity storage device, the voltage sampling device and the single chip microcomputer are packaged in the waterproof shell.
Furthermore, the power management circuit is connected with the electric quantity storage device, the voltage sampling device and the single chip microcomputer and is packaged in the waterproof shell together, and is connected with two groups of electrode unit connecting contacts positioned at the bottom of the waterproof shell, wherein one group of electrode unit connecting contacts are connected with the laminated electrode; and the other group of electrode units are connected with the contact points and connected with the sensor information acquisition unit.
Furthermore, the sensor information acquisition unit is composed of a hydrophobic substrate and metal electrodes arranged on the substrate, water-absorbing materials are not covered between the metal electrodes, and metal connecting contacts connected with the connecting contacts of the other group of electrode units are arranged at the top of the sensor information acquisition unit.
The invention has the beneficial effects that: firstly, an original battery or a voltaic battery is directly formed by electrolyte liquid absorbed from a detected environment and a laminated electrode without external battery/power supply, so that a power supply is provided for the whole wireless alarm device, and the energy is saved and the cost is low; secondly, the application range is wide, the power supply does not need to be replaced, and the application range is more suitable for occasions; the system is particularly suitable for distributed wireless water level monitoring, dam leakage monitoring, tank leakage monitoring, water level monitoring and other application occasions related to humidity; fourthly, the humidity state can be directly detected, and the method can also be applied to passive wireless remote detection of temperature, pH value and other monitoring parameters accompanied with humidity.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is a block diagram of the present invention.
Fig. 3 is a circuit diagram of a single chip of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 3 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Referring to fig. 1 to 3, an energy self-supplying wireless alarm device based on humidity triggering includes: the stacked electrode device comprises a stacked electrode 1, a power management circuit 3, an electric quantity storage device, a voltage sampling device, a single chip microcomputer U1 and a sensor information acquisition unit S1; the laminated electrode 1 is formed by alternately arranging two conductive materials with different electric potentials, the positive electrode and the negative electrode of the laminated electrode are respectively connected with two ends of a power management circuit, an electric quantity storage device is connected with the power management circuit 3 in parallel, two ends of the electric quantity storage device are also connected with a single chip microcomputer U1, one end of a voltage sampling device is connected with one end of the electric quantity storage device, the other end of the voltage sampling device is connected with a single chip microcomputer U1, and a sensor information acquisition unit S1 is also connected with the single chip microcomputer U1; two conductive materials with different electric potentials, such as aluminum/carbon, aluminum/copper, zinc/carbon, zinc/copper, and the like.
The type of the singlechip is as follows: STM 32; preferably, the model is STM32L 051.
A wireless alarm device capable of self-supplying energy based on humidity triggering is characterized in that an electric quantity storage device is a capacitor C2, and a voltage sampling device is a resistor R3.
A humidity-triggered energy self-supply wireless alarm device is characterized in that a laminated electrode is formed by connecting a plurality of electrode anodes and electrode cathodes in series or in parallel, and when the adjacent anodes and cathodes are wetted by electrolyte liquid from a tested environment, a primary battery or a voltaic battery is formed by the corresponding electrodes and the absorbed electrolyte liquid so as to provide power for the whole circuit. Electrolyte liquid adsorption materials are filled between the electrodes forming the primary battery; between the cells there is an insulating separator separating the electrolyte liquid.
A wireless alarm device based on humidity triggering and energy self-supply is characterized in that a laminated electrode 1 is formed by arranging a plurality of electrode anodes 8, electrode cathodes 7 and electrolyte absorption liquid layers 6 positioned between the adjacent electrode anodes and the adjacent electrode cathodes. The electrolyte adsorbing liquid layer 6 is made of water-absorbing material, and the water-absorbing material is at least one of water-absorbing paper, cellulose, water-absorbing resin and hydrophilic high polymer.
A humidity-triggered energy self-supply wireless alarm device is provided, wherein a power management circuit 3 comprises: the power supply comprises a booster circuit, a rectifying and filtering circuit and a power supply switch circuit; the booster circuit includes: the circuit comprises a resistor R1, a transformer T1 and a triode Q1; the rectifying and filtering circuit includes: diode D1, capacitor C1; the power switching circuit includes: diode D2, resistance R2, MOS pipe Q3 and triode Q2.
An energy self-supply wireless alarm device based on humidity triggering is characterized in that the input end of a transformer T1 is connected with the positive electrode of an electrode, one end of the output end of a transformer T1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the base electrode of a triode Q1, the output end of a transformer T1 is also connected with the collector electrode of a triode Q1 and the positive electrode of a diode D1, and the emitter electrode of the triode Q1 is connected with the negative electrode of the electrode; the cathode of the diode D1 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is connected with the cathode of the electrode; one end of the capacitor C1 is also connected with the cathode of the diode D2 and the drain of the MOS transistor Q3, the anode of the diode D2 is connected with one end of the resistor R2 and the base of the triode Q2, and the other end of the resistor R2 is connected with the cathode of the emitter of the triode Q2; the collector of the triode Q2 is connected with the grid of the MOS tube Q3; the source electrode of the MOS transistor Q3 is connected with one end of a capacitor C2 and one end of a resistor R3, and the other end of the resistor R3 is connected with the single chip microcomputer; the other end of the capacitor C2 is connected with the negative electrode of the electrode.
A wireless alarm device capable of self-supplying energy based on humidity triggering is characterized in that a single chip microcomputer is further connected with a signal transmitting and receiving antenna and a radio frequency module. The singlechip U1 is provided with a communication module U2, and a pin RESET of the communication module is connected with a pin PB3 of the singlechip; a pin RXD of the communication module is connected with a pin PA14 of the singlechip; the pin TXD of the communication module is connected with the pin PA15 of the singlechip, and the pin DBG _ RXD of the communication module is connected with the pin PA9 of the singlechip; a pin DBG _ TXD of the communication module is connected with a pin PA10 of the singlechip; the pin DATA of the communication module is connected with the pin DATA of the SIM card module; a pin CLK of the communication module is connected with a pin CLK of the SIM card module; a pin RST of the communication module is connected with a pin RST of the SIM card module; pin VDD of the communication module is connected with pin VDD of the SIM card module U3, and pin ANT of the communication module is connected with the signal transmitting and receiving antenna.
A wireless alarm device based on humidity triggering and energy self-supply is characterized in that a laminated electrode 1 is composed of two different metal sheets or metals and other conductive materials (nonmetal or certain oxides and the like), such as copper and aluminum or copper and zinc, two different electrodes + and electrodes-materials which are tightly attached to the middle of the electrode and adsorb electrolyte liquid, when the materials absorb moisture, a potential difference e1 is generated between the electrodes to form a multilayer laminated structure, adjacent groups of electrodes are connected in series, and electromotive force is accumulated by multiples of e 1. The electromotive force generated above is connected to a subsequent power management circuit, and a resistor R1, a transformer T1 and a triode Q1 in the power management circuit unit form a booster circuit; the diode D1 and the capacitor C1 form a rectifying and filtering circuit; diode D2, resistor R2, MOS transistor Q3 and transistor Q2 form a power switch circuit, and when the voltage on C1 is higher than the reverse breakdown voltage of zener diode D2, MOS transistor Q3 is turned on. The capacitor C2 is used as an electric quantity storage device, the resistor R3 is used as a voltage sampling device, the capacitor C2 starts to charge when the MOS tube is opened, the single chip microcomputer collects the voltage on the C2 through the resistor R3, and when the voltage on the C2 meets working conditions, the single chip microcomputer starts to collect information such as temperature and humidity and triggers the radio frequency module to send the information to the outside, and one-time or multiple-time information reporting is completed. After the information reporting is completed, the single chip microcomputer and the radio frequency module consume the electric quantity on the C2, the voltage of the C2 is reduced, the single chip microcomputer starts to enter a dormant state, and a new round of information reporting is started again until the voltage of the C2 continuously rises to meet the working state.
A pin of the single chip microcomputer: the other end of the resistor R3 is connected with a PA6 pin of the singlechip.
The single chip microcomputer is also connected with a sensor information acquisition unit, and the sensor information acquisition unit is connected with a pin PA2 of the single chip microcomputer through a SENS _ A; and is connected with a pin PA3 of the singlechip through a SENS _ B. And a VSS pin of the singlechip is connected with the ground.
A wireless alarm device of energy self-supply based on humidity triggering, the power management circuit is encapsulated in the waterproof outer cover 2, and connect the first electrode metal contact 12 and the first information acquisition metal contact 4 located in the bottom of the waterproof outer cover 2; a second electrode metal contact 10 corresponding to the first electrode metal contact and a second information acquisition metal contact 5 corresponding to the first information acquisition metal contact are arranged at the upper end of the water permeable shell 11, and a laminated electrode 1 is arranged in the water permeable shell 11; the laminated electrode 1 is connected with a second electrode metal contact 10, and is connected with a first electrode metal contact 12 through the second electrode metal contact 10 to be connected with the power management circuit 3, a sensor information acquisition unit S1 is further arranged in the water permeable shell 11, a water absorption material 9 is arranged on the outer side of the sensor information acquisition unit S1, and the sensor information acquisition unit S1 is connected with a second information acquisition metal contact 5, and is connected with a first information acquisition metal contact 4 through the second information acquisition metal contact 5 to be connected with the power management circuit 3. The first electrode metal contact 12, the first information-collecting metal contact 4, the second electrode metal contact 10, and the second information-collecting metal contact 5 are made of copper. When the water-permeable shell 11 is soaked by the liquid containing the electrolyte, voltage can be generated on the two laminated electrodes, and the voltage is connected into the waterproof shell through the first electrode metal contact, the first information acquisition metal contact, the second electrode metal contact and the second information acquisition metal contact to provide working power supply and humidity information for the control circuit module.
The utility model provides an energy self-feeding wireless alarm device based on humidity triggers, connects electric quantity memory device, voltage sampling device and singlechip between power management circuit and the first information acquisition metal contact, and electric quantity memory device, voltage sampling device and singlechip encapsulation are in waterproof shell.
A wireless alarm device capable of self-supplying energy based on humidity triggering is characterized in that a power management circuit is connected with an electric quantity storage device, a voltage sampling device and a single chip microcomputer and is packaged in a waterproof shell together, and is connected with two groups of electrode unit connecting contacts positioned at the bottom of the waterproof shell, wherein one group of electrode unit connecting contacts are connected with a laminated electrode; and the other group of electrode units are connected with the contact points and connected with the sensor information acquisition unit.
The utility model provides an energy self-feeding wireless alarm device based on humidity triggers, sensor information acquisition unit comprises hydrophobic basement and the metal electrode of establishing on the basement, and no absorbent material covers between the metal electrode, and the top is equipped with the metal connection contact of connecting another group of electrode unit connection contact. The hydrophobic substrate may be made of quartz polymer; the metal electrode is made of copper or aluminum.
The energy self-supplying humidity alarm has two groups of electrode units, one of which is used to provide power source for the whole circuit and activate the humidity alarm. When the part is soaked by liquid containing electrolyte, voltage can be generated on the two electrodes, and the voltage is connected to a power management circuit through a metal contact to provide working power and disposable humidity information for the single chip microcomputer.
The other group of electrode units is mainly used for the single chip microcomputer to independently collect humidity (or other) signals so as to realize real-time continuous monitoring of the humidity (or other signals). When the part is wetted by a liquid containing an electrolyte, a relatively high voltage is generated between the two electrodes; when the liquid is soaked and withdrawn, the two electrodes will be separated from the liquid connection immediately due to the hydrophobic property of the substrate support material, and the voltage between the electrodes will be reduced to zero rapidly, so that the real-time continuous monitoring of the specific liquid level is realized. The real-time voltage output by the electrode is connected to the singlechip through the metal contact, so that the singlechip can collect and analyze humidity information. The electrode units can directly detect the humidity state, and can also be applied to real-time continuous detection of other monitoring parameters such as temperature, pH value, pressure and the like which are accompanied with the humidity.
An energy self-supplying wireless alarm device based on humidity triggering, the function of range upon range of formula electrode has two: firstly, forming a primary battery to generate voltage to provide an electric energy source for a subsequent circuit; and the second sensor is used as a sensor, and if the leakage moisture/the overflow moisture occurs, an electric signal is generated. The sensor information acquisition unit is mainly used for real-time continuous monitoring of humidity (or other signals such as temperature). The power management circuit mainly realizes the storage, detection and release of energy and plays roles of boosting, stabilizing and switching. The single chip microcomputer is mainly used for transmitting information, once the voltage reaches a starting threshold, the single chip microcomputer starts to work and controls the radio frequency module to send alarm information. The stacked electrodes are present as energy harvesting and sensing portions to provide energy to the power management circuit. The sensor information acquisition unit provides a real-time continuous monitoring function for other signals such as humidity or temperature. The power management circuit mainly manages and controls the micro energy provided by the last unit, so that the output voltage of the power management circuit accords with the working conditions of the single chip microcomputer and the radio frequency module.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (10)
1. A humidity-triggered energy self-powered wireless warning device comprising: the device comprises a laminated electrode, a power management circuit, a power storage device, a voltage sampling device, a single chip microcomputer and a sensor information acquisition unit; the method is characterized in that: the stacked electrode is formed by alternately arranging two conductive materials with different electric potentials, the positive electrode and the negative electrode of the stacked electrode are respectively connected with two ends of a power management circuit, an electric quantity storage device is connected with the power management circuit in parallel, two ends of the electric quantity storage device are also connected with a single chip microcomputer, one end of a voltage sampling device is connected to one end of the electric quantity storage device, the other end of the voltage sampling device is connected to the single chip microcomputer, and a sensor information acquisition unit is also connected to the single chip microcomputer.
2. The humidity trigger-based energy self-supply wireless alarm device as claimed in claim 1, wherein: the laminated electrode is formed by connecting a plurality of electrode anodes and electrode cathodes in series or in parallel.
3. The humidity trigger-based energy self-supply wireless alarm device as claimed in claim 1, wherein: the charge storage device is a capacitor C2 and the voltage sampling device is a resistor R3.
4. The humidity trigger-based energy self-supply wireless alarm device as claimed in claim 3, wherein: the power management circuit includes: the power supply comprises a booster circuit, a rectifying and filtering circuit and a power supply switch circuit; the booster circuit includes: the circuit comprises a resistor R1, a transformer T1 and a triode Q1; the rectifying and filtering circuit includes: diode D1, capacitor C1; the power switching circuit includes: diode D2, resistance R2, MOS pipe Q3 and triode Q2.
5. The humidity trigger-based energy self-supply wireless alarm device as claimed in claim 4, wherein: the input end of the transformer T1 is connected with the positive electrode of the electrode, one end of the output end of the transformer T1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the base electrode of a triode Q1, the output end of the transformer T1 is also connected with the collector electrode of a triode Q1 and the positive electrode of a diode D1, and the emitter electrode of the triode Q1 is connected with the negative electrode of the electrode; the cathode of the diode D1 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is connected with the cathode of the electrode; one end of the capacitor C1 is also connected with the cathode of the diode D2 and the drain of the MOS transistor Q3, the anode of the diode D2 is connected with one end of the resistor R2 and the base of the triode Q2, and the other end of the resistor R2 is connected with the cathode of the emitter of the triode Q2; the collector of the triode Q2 is connected with the grid of the MOS tube Q3; the source electrode of the MOS transistor Q3 is connected with one end of a capacitor C2 and one end of a resistor R3, and the other end of the resistor R3 is connected with the single chip microcomputer; the other end of the capacitor C2 is connected with the negative electrode of the electrode.
6. The humidity trigger-based energy self-supply wireless alarm device as claimed in claim 5, wherein: the singlechip is also connected with a signal transmitting and receiving antenna.
7. The humidity trigger-based energy self-supply wireless alarm device as claimed in claim 1, wherein: the power management circuit is packaged in the waterproof shell and connected with the first electrode metal contact and the first information acquisition metal contact which are positioned at the bottom of the waterproof shell; a second electrode metal contact corresponding to the first electrode metal contact and a second information acquisition metal contact corresponding to the first information acquisition metal contact are arranged at the upper end of the water permeable shell, and a laminated electrode is arranged in the water permeable shell; the laminated electrode is connected with the second electrode metal contact and connected with the first electrode metal contact through the second electrode metal contact and the power management circuit, the sensor information acquisition unit is further arranged in the water permeable shell and connected with the second information acquisition metal contact, and the second information acquisition metal contact is connected with the first information acquisition metal contact and the power management circuit.
8. The humidity trigger-based energy self-supplying wireless alarm device as claimed in claim 7, wherein: the power management circuit is connected with the first information acquisition metal contact through the electric quantity storage device, the voltage sampling device and the single chip microcomputer, and the electric quantity storage device, the voltage sampling device and the single chip microcomputer are packaged in the waterproof shell.
9. The humidity trigger-based energy self-supply wireless alarm device as claimed in claim 1, wherein: the power management circuit is connected with the electric quantity storage device, the voltage sampling device and the single chip microcomputer and is packaged in the waterproof shell together, and is connected with two groups of electrode unit connecting contacts positioned at the bottom of the waterproof shell, wherein one group of electrode unit connecting contacts are connected with the laminated electrode; and the other group of electrode units are connected with the contact points and connected with the sensor information acquisition unit.
10. The humidity trigger-based energy self-supply wireless alarm device as claimed in claim 1, wherein: the sensor information acquisition unit consists of a hydrophobic substrate and metal electrodes arranged on the substrate, wherein the metal electrodes are covered by a non-water-absorbing material, and the top of the sensor information acquisition unit is provided with a metal connecting contact connected with the other group of electrode unit connecting contacts.
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| CN201920032371.6U CN210427430U (en) | 2019-01-09 | 2019-01-09 | Energy self-supply wireless alarm device based on humidity triggering |
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| CN201920032371.6U CN210427430U (en) | 2019-01-09 | 2019-01-09 | Energy self-supply wireless alarm device based on humidity triggering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023247621A1 (en) * | 2022-06-24 | 2023-12-28 | Universität Paderborn | Humidity sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023247621A1 (en) * | 2022-06-24 | 2023-12-28 | Universität Paderborn | Humidity sensor |
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