JPH048355Y2 - - Google Patents
Info
- Publication number
- JPH048355Y2 JPH048355Y2 JP1984138104U JP13810484U JPH048355Y2 JP H048355 Y2 JPH048355 Y2 JP H048355Y2 JP 1984138104 U JP1984138104 U JP 1984138104U JP 13810484 U JP13810484 U JP 13810484U JP H048355 Y2 JPH048355 Y2 JP H048355Y2
- Authority
- JP
- Japan
- Prior art keywords
- output
- humidity
- level voltage
- humidity sensor
- detection device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 18
- 230000000737 periodic effect Effects 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
【考案の詳細な説明】
(イ) 産業上の利用分野
本考案は湿度検出装置に係り、特にこの湿度検
出装置をマイクロプロセツサなどの演算ユニツト
を有する機器に用いる場合の回路の簡略化に関す
るものである。[Detailed description of the invention] (a) Industrial application field The present invention relates to a humidity detection device, and particularly relates to the simplification of a circuit when this humidity detection device is used in a device having an arithmetic unit such as a microprocessor. It is.
(ロ) 従来の技術
一般に従来の湿度検出装置の回路としては特開
昭57−95539号公報に記載されているようなもの
があつた。この公報には湿度センサと、発振回路
と、交流−直流変換器とから構成された湿度検出
装置が記載されていた。湿度センサは櫛型の電極
を有し、湿度によつて変化するこの電極間の導電
率から湿度を検知していた。このため湿度センサ
には電極間の溶着を防ぐため発振回路より交流電
圧が印加されていた。従つて、湿度センサからの
検知出力は交流出力となるので、この出力を交流
−直流変換器で変換しなければ湿度の検出値を得
ることができないものであつた。(b) Prior Art In general, a circuit for a conventional humidity detection device is described in Japanese Patent Application Laid-Open No. 57-95539. This publication describes a humidity detection device that includes a humidity sensor, an oscillation circuit, and an AC-DC converter. The humidity sensor has comb-shaped electrodes, and detects humidity from the conductivity between the electrodes, which changes depending on the humidity. For this reason, an alternating voltage is applied to the humidity sensor from an oscillation circuit to prevent welding between the electrodes. Therefore, since the detection output from the humidity sensor becomes an AC output, a detected humidity value cannot be obtained unless this output is converted by an AC-DC converter.
(ハ) 考案が解決しようとする問題点
以上のように従来の湿度検出装置では湿度セン
サに交流電圧を印加するために発振回路を必要と
し、同時に湿度センサの交流出力を直流に変換す
る交流−直流変換器を必要とし、湿度検出装置の
回路構成が複雑となり、その分基板上のスペース
を多く必要とするものであつた。従つて、この湿
度検出装置を組み込んだ機器の小型化を妨げる問
題点があつた。(c) Problems that the invention aims to solve As mentioned above, conventional humidity detection devices require an oscillation circuit to apply an AC voltage to the humidity sensor, and at the same time require an oscillation circuit to convert the AC output of the humidity sensor into DC. This requires a direct current converter, complicates the circuit configuration of the humidity detection device, and requires a large amount of space on the board. Therefore, there has been a problem that prevents miniaturization of equipment incorporating this humidity detection device.
斯かる問題点に鑑み、本考案は簡単な回路で構
成できる湿度検出装置を提供するものである。 In view of such problems, the present invention provides a humidity detection device that can be configured with a simple circuit.
(ニ) 問題点を解決するための手段
本考案は動作制御部としてマイクロプロセツサ
などの演算ユニツトを有する機器に用いられる湿
度検出装置において、演算ユニツトにＨレベル電
圧とＬレベル電圧とからなる周期的な方形波を出
力する出力端子を設け、定電圧化された直流電圧
と接地電位との間に第１抵抗素子及び第２抵抗素
子を直列に接続し、第１抵抗素子及び第２抵抗素
子の接続点と出力端子との間に湿度センサを接続
し、前記出力端子のＨレベル電圧又はＬレベル電
圧の出力に同期して入力電位をデジタル信号に変
換するアナログ／デジタル変換部を前記接続点に
接続するものである。(d) Means for Solving Problems The present invention provides a humidity detection device used in equipment having an arithmetic unit such as a microprocessor as an operation control section, in which the arithmetic unit has a cycle consisting of an H level voltage and an L level voltage. An output terminal that outputs a square wave is provided, a first resistance element and a second resistance element are connected in series between the regulated DC voltage and the ground potential, and the first resistance element and the second resistance element are connected in series. A humidity sensor is connected between the connection point and the output terminal, and an analog/digital converter that converts the input potential into a digital signal in synchronization with the output of the H level voltage or L level voltage of the output terminal is connected to the connection point. It is connected to.
(ホ) 作用
このような本考案の湿度検出装置を用いれば機
器の演算ユニツトからの方形波信号を利用でき、
発振回路を不要にすることができる。また、この
方形波信号に同期して湿度センサの出力を変換す
るので交流−直流変換器も不要とすることができ
る。すなわち湿度検出装置の回路構成を簡略化で
きるものである。(E) Effect If the humidity detection device of the present invention is used as described above, the square wave signal from the arithmetic unit of the device can be used.
An oscillation circuit can be made unnecessary. Furthermore, since the output of the humidity sensor is converted in synchronization with this square wave signal, an AC-DC converter can also be eliminated. That is, the circuit configuration of the humidity detection device can be simplified.
(ヘ) 実施例
以下、本考案の実施例を第１図、第２図に基づ
いて説明すると、先ず第１図において、１はマイ
クロプロセツサであり、例えば空気調和機の運転
制御を主に行なうものである。端子は出力端子
であり、第２図に示すような周期的なパルスが出
力される。この図において、ＨはＨレベル電圧
（本実施例では約5V）、ＧはＬレベル電圧（本実
施例では接地電位）であり、周期は0.1〜0.5秒位
すなわちマイクロプロセツサ１が湿度データを必
要とする周期又は湿度センサの応答速度に応じて
任意に設定する。２は湿度センサであり、櫛型の
電極を有し、湿度によつて抵抗値が変化するもの
である。この湿度センサ２は一端をマイクロプロ
セツサ１の端子に接続し、他端を抵抗３を介し
て第１抵抗４と第２抵抗５との接続点に接続して
いる。又第１抵抗４の一端は直流電源＋Vccに接
続し、第２抵抗５の一端は接地レベルに接続され
ている。抵抗３は湿度センサ２に過電流が流れる
のを防止する保護用であり、第１抵抗４、第２抵
抗５、直流電源＋Vccの電圧値は、第１抵抗４と
第２抵抗５との接続点に表われる電位が湿度セン
サ２を接続していない状態で約2.5〔Ｖ〕（Ｈレベ
ル電圧の約1/2）になるように設定している。従
つて、マイクロプロセツサ１の出力端子の出力
がＨレベル電圧の時には、湿度センサ２の中を電
流が出力端子側から第１抵抗４と第２抵抗５と
の接続点側へ向つて流れ、マイクロプロセツサ１
の出力端子の出力がＬレベル電圧の時には、湿
度センサ２の中を電流が接続点側から出力端子
側へ向つて流れる。６はアナログ／デジタル変換
器すなわちＡ／Ｄ変換器であり、Ａ／Ｄ変換端子
ADSに方形波信号のＬレベルが与えられている
時のみ、アナログ端子Ａに与えられたアナログ電
圧をデータ端子Ｄから4bitの信号に変換してマイ
クロプロセツサ１の端子Ｉへ出力する。(F) Embodiment Below, an embodiment of the present invention will be explained based on FIGS. 1 and 2. First, in FIG. It is something to do. The terminal is an output terminal, and periodic pulses as shown in FIG. 2 are output. In this figure, H is an H level voltage (approximately 5V in this embodiment), G is an L level voltage (ground potential in this embodiment), and the period is about 0.1 to 0.5 seconds, that is, the microprocessor 1 collects humidity data. Set arbitrarily according to the required cycle or response speed of the humidity sensor. Reference numeral 2 denotes a humidity sensor, which has a comb-shaped electrode and whose resistance value changes depending on the humidity. This humidity sensor 2 has one end connected to a terminal of the microprocessor 1, and the other end connected via a resistor 3 to a connection point between a first resistor 4 and a second resistor 5. Further, one end of the first resistor 4 is connected to the DC power supply + Vcc , and one end of the second resistor 5 is connected to the ground level. The resistor 3 is for protection to prevent overcurrent from flowing to the humidity sensor 2, and the voltage values of the first resistor 4, the second resistor 5, and the DC power supply + Vcc are the same as the voltage values of the first resistor 4 and the second resistor 5. The potential appearing at the connection point is set to be approximately 2.5 [V] (approximately 1/2 of the H level voltage) when the humidity sensor 2 is not connected. Therefore, when the output of the output terminal of the microprocessor 1 is an H level voltage, a current flows through the humidity sensor 2 from the output terminal side to the connection point between the first resistor 4 and the second resistor 5. Microprocessor 1
When the output of the output terminal is an L level voltage, a current flows through the humidity sensor 2 from the connection point side to the output terminal side. 6 is an analog/digital converter, that is, an A/D converter, and an A/D conversion terminal
Only when the L level of the square wave signal is applied to ADS, the analog voltage applied to analog terminal A is converted into a 4-bit signal from data terminal D and output to terminal I of microprocessor 1.
尚、アナログ／デジタル変換器６はマイクロプ
ロセツサ１にハードウエア及びソフトウエアで構
成してもよい。 Note that the analog/digital converter 6 may be configured in the microprocessor 1 by hardware and software.
以上のように構成された湿度検出装置はマイク
ロプロセツサ１が空気調和運転の制御を行なつて
いる時に、マイクロプロセツサ１の端子から第
２図の“端子の出力”に示す方形波信号が出力
され以下の動作を行なう。まず湿度が高い時には
湿度センサ２の抵抗値が小さくなるので、Ａ／Ｄ
変換器６の端子Ａに印加される電圧は第２図の
“端子Ａ”の実線の出力となる。又湿度が低い時
には湿度センサ２の抵抗値が高くなるので、Ａ／
Ｄ変換器６の端子Ａに印加される電圧は第２図の
“端子Ａ”の点線の出力となる。ここでＡ／Ｄ変
換器６は端子ADSがＬレベル電圧の時のみ動作
するので、第２図に示すD1又はD2の電圧値がデ
ジタル値に変換され、4bitの湿度データとしてマ
イクロプロセツサ１の端子Ｉへ出力される。 In the humidity detection device configured as described above, when the microprocessor 1 is controlling the air conditioning operation, the square wave signal shown in "Terminal output" in Fig. 2 is output from the terminal of the microprocessor 1. It is output and performs the following operations. First, when the humidity is high, the resistance value of humidity sensor 2 becomes small, so the A/D
The voltage applied to terminal A of the converter 6 becomes the solid line output of "terminal A" in FIG. Also, when the humidity is low, the resistance value of humidity sensor 2 increases, so A/
The voltage applied to terminal A of the D converter 6 becomes the output indicated by the dotted line of "terminal A" in FIG. Here, since the A/D converter 6 operates only when the terminal ADS is an L level voltage, the voltage value of D1 or D2 shown in FIG. It is output to terminal I of 1.
(ト) 考案の効果
以上のように本考案は動作制御部としてマイク
ロプロセツサなどの演算ユニツトを有する機器に
用いられる湿度検出装置において、演算ユニツト
からの周期的なパルス出力を湿度センサに印加し
て、このパルス出力に同期して湿度センサの検出
値をデジタルデータにアナログ／デジタル変換部
で変換させるので、演算ユニツトからの出力を利
用し、従来と比べ発振回路を不要にでき、さらに
パルス出力に同期してアナログ／デジタル変換が
行なえ実質的な同期検波になり従来のような交流
−直流変換回路が不要になる。すなわち、湿度検
出装置の回路構成を簡略化して機器の小型化を促
進できるものである。(g) Effects of the invention As described above, the present invention applies periodic pulse output from the calculation unit to the humidity sensor in a humidity detection device used in a device having a calculation unit such as a microprocessor as an operation control section. Since the detected value of the humidity sensor is converted into digital data by the analog/digital converter in synchronization with this pulse output, the output from the arithmetic unit is used, making it possible to eliminate the need for an oscillation circuit compared to conventional methods, and furthermore, the pulse output Analog/digital conversion can be performed in synchronization with , resulting in substantially synchronous detection, eliminating the need for a conventional AC-DC conversion circuit. That is, it is possible to simplify the circuit configuration of the humidity detection device and promote miniaturization of the device.
第１図は本考案の実施例を示す装置の電気回路
図、第２図は方形波信号及び湿度センサの出力を
示す波形図である。
１……マイクロプロセツサ、２……湿度セン
サ、４……第１抵抗、５……第２抵抗、６……
Ａ／Ｄ変換器。
FIG. 1 is an electrical circuit diagram of a device showing an embodiment of the present invention, and FIG. 2 is a waveform diagram showing a square wave signal and the output of a humidity sensor. 1... Microprocessor, 2... Humidity sensor, 4... First resistor, 5... Second resistor, 6...
A/D converter.
Claims (1)
算ユニツトを有する機器に用いられる湿度検出装
置において、演算ユニツトにＨレベル電圧とＬレ
ベル電圧とからなる周期的な方形波を出力する出
力端子を設け、定電圧化された直流電圧と接地電
位との間に第１抵抗素子及び第２抵抗素子を直列
に接続し、第１抵抗素子及び第２抵抗素子の接続
点と出力端子との間に湿度センサを接続し、前記
出力端子のＨレベル電圧又はＬレベル電圧の出力
に同期して入力電位をデジタル信号に変換するア
ナログ／デジタル変換部を前記接続点に接続する
と共にこのアナログ／デジタル変換部から出力さ
れるデジタル信号を前記演算ユニツトに供給する
ことを特徴とする湿度検出装置。 In a humidity detection device used in a device having an arithmetic unit such as a microprocessor as an operation control section, the arithmetic unit is provided with an output terminal that outputs a periodic square wave consisting of an H level voltage and an L level voltage. A first resistance element and a second resistance element are connected in series between the converted DC voltage and a ground potential, and a humidity sensor is connected between the connection point of the first resistance element and the second resistance element and the output terminal. An analog/digital converter that converts the input potential into a digital signal in synchronization with the output of the H level voltage or L level voltage of the output terminal is connected to the connection point, and the signal is output from the analog/digital converter. A humidity detection device characterized in that a digital signal is supplied to the arithmetic unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984138104U JPH048355Y2 (en) | 1984-09-12 | 1984-09-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984138104U JPH048355Y2 (en) | 1984-09-12 | 1984-09-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6152264U JPS6152264U (en) | 1986-04-08 |
| JPH048355Y2 true JPH048355Y2 (en) | 1992-03-03 |
Family
ID=30696501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984138104U Expired JPH048355Y2 (en) | 1984-09-12 | 1984-09-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH048355Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56164949A (en) * | 1980-05-23 | 1981-12-18 | Matsushita Electric Ind Co Ltd | Multifunction detector |
-
1984
- 1984-09-12 JP JP1984138104U patent/JPH048355Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56164949A (en) * | 1980-05-23 | 1981-12-18 | Matsushita Electric Ind Co Ltd | Multifunction detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6152264U (en) | 1986-04-08 |
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