CN201903406U

CN201903406U - Temperature and humidity sensor

Info

Publication number: CN201903406U
Application number: CN2010206526215U
Authority: CN
Inventors: 郭斌斌; 李秋山; 郭朝军
Original assignee: HENAN TONGSHENG ELECTRONICS TECHNOLOGY CO LTD
Current assignee: HENAN TONGSHENG ELECTRONICS TECHNOLOGY CO LTD
Priority date: 2010-12-10
Filing date: 2010-12-10
Publication date: 2011-07-20
Anticipated expiration: 2020-12-10

Abstract

The utility model relates to a temperature and humidity sensor for detection of grain storage conditions, which comprises a single-chip microcomputer, a peripheral circuit and a serial communication circuit and a power supply circuit. A power supply circuit is used for powering up the components of the sensor, the peripheral circuit comprises an external clock, a memory and input buttons, a temperature and humidity detection circuit adopts one chip of SHC1x or SHC7x series, the power end of a digital temperature and humidity detection circuit chip is connected with the anode output end of the power supply circuit, the grounding end of the digital temperature and humidity detection circuit chip is grounded, the serial clock input end (SCK) and the serial data end (DATA) of the digital temperature and humidity detection circuit chip are connected with corresponding I/O (input/output) ports of the single-chip microcomputer, and the serial data end of the single-chip microcomputer is connected with the power end through a pull-up resistor; and the single-chip microcomputer and the serial communication circuit are connected through corresponding communication ports for uplink communication. The temperature and humidity sensor has a reasonable design, a simple circuit structure, a low cost and high measurement accuracy, and can provide accurate detection data for monitoring of the grain storage conditions.

Description

A kind of Temperature Humidity Sensor

Technical field

The utility model relates to a kind of sensor, particularly relates to the Temperature Humidity Sensor that a kind of grain feelings that are used to store in a warehouse detect.

Background technology

Grain reserves are the major issues that concern national economy.Grain is subjected to the influence of temperature, humidity, moisture and other factor in storage, may occur generating heat, go mouldy, situation such as insect pest is grown, in order to reduce the loss in the foodstuff preservation process, ensure the quality and the quality of grain, the situation of change of various physical quantitys is found out its Changing Pattern at first should grasp foodstuff preservation process promptly and accurately.And temperature, humidity are two important indicators that the grain feelings detect, the accurate detection of stored grain data, can provide scientific basis for grain end of loveization and grain information monitoring analysis, helping provides rational and effective to handle suggestion to unusual grain feelings, with timely employing control measure etc., for science and safe grain storage provide technical support.And along with development of modern science and technology, traditional temperature, humidity detector can not well adapt to the needs of current grain information monitoring system.

The utility model content

The utility model proposes a kind of simple in structure, the Temperature Humidity Sensor that measuring accuracy is high.

The technical scheme that the utility model adopted:

A kind of Temperature Humidity Sensor, contain single-chip microcomputer and peripheral circuit, the digital Temperature and Humidity testing circuit, power circuit, serial communication circuit, power circuit provides working power for the sensor each several part, peripheral circuit comprises external clock, storer and input button, described digital Temperature and Humidity testing circuit adopts any chip of SHC1x or SHC7x series, the power end of digital Temperature and Humidity testing circuit chip connects the cathode output end of power circuit, the earth terminal ground connection of digital Temperature and Humidity testing circuit chip, its serial clock input end (SCK) is connected the corresponding I/O port of single-chip microcomputer with serial data end (DATA), its serial data end connects power end by pull-up resistor; Single-chip microcomputer is connected by corresponding PORT COM with serial communication circuit, realizes uplink communication.

Described Temperature Humidity Sensor, single-chip microcomputer adopts 89C2051, storer adopts integrated circuit (IC) chip MAX813, the read-write input port (WDI) of MAX813 connects an external interrupt input port of single-chip microcomputer, the reset terminal of MAX813 connects the reset terminal of single-chip microcomputer, and the master control reset terminal (MR) of MAX813 is connected with read-write output port (WDO).

Described Temperature Humidity Sensor, serial communication circuit adopts integrated circuit (IC) chip MAX485, and MAX485 is connected single-chip microcomputer by the control corresponding port with FPDP, and power circuit out-put supply end is provided with the filter capacitor of ground connection.

Described Temperature Humidity Sensor, contain the warning indicating circuit, the warning indicating circuit adopts the LED luminotron to connect power supply by current-limiting resistance, the anodal collector output that connects transistor amplifier in the transistor amplifier circuit of described LED luminotron, the grounded emitter of described transistor amplifier, its control base stage connects or one group of I/O output port of single-chip microcomputer.

Useful good effect of the present utility model:

1, the utility model Temperature Humidity Sensor is reasonable in design, and circuit structure is simple, and cost is low, and the measuring accuracy height can detect data accurately for the monitoring of storage grain feelings provides.Employing super fast response, the SHCxx sensor that antijamming capability is strong, cost performance is high, each SHCxx sensor is all calibrated in very accurate humidity verification chamber, adopt two-wire system serial line interface and internal reference voltage, make the system integration become simple and easy quick, make sensor have extra small volume and extremely low power consumption.

2, the utility model Temperature Humidity Sensor, critical piece humidity-sensitive element use U.S. JILAKG company product, and functional parameter meets GB GB/T6587.3-1986, have anti-stifling, corrosion-resistant, the characteristics of long service life, serviceable life 〉=5 year.

Description of drawings

Fig. 1: the utility model Temperature Humidity Sensor electrical schematic diagram.

Embodiment

Embodiment one: referring to Fig. 1, the utility model Temperature Humidity Sensor, contain single-chip microcomputer and peripheral circuit, the digital Temperature and Humidity testing circuit, power circuit, serial communication circuit, power circuit provides working power for the sensor each several part, described peripheral circuit comprises external clock, storer and input button, described digital Temperature and Humidity testing circuit adopts any chip of SHC1x or SHC7x series, the power end of digital Temperature and Humidity testing circuit chip connects the cathode output end of power circuit, the earth terminal ground connection of digital Temperature and Humidity testing circuit chip, its serial clock input end SCK is connected the corresponding I/O port of single-chip microcomputer with serial data end DATA, its serial data end connects power end by pull-up resistor; Single-chip microcomputer is connected by corresponding PORT COM with the serial communication chip, realizes uplink communication.

Embodiment two: referring to Fig. 1, the Temperature Humidity Sensor of present embodiment, single-chip microcomputer adopts 89C2051, storer adopts integrated circuit MAX813 chip, the read-write input port WDI of MAX813 connects an external interrupt input port of single-chip microcomputer, the reset terminal of MAX813 connects the reset terminal of single-chip microcomputer, and the master control reset terminal MR of MAX813 is connected with read-write output port WDO.Serial communication circuit adopts the MAX485 chip, and MAX485 is connected single-chip microcomputer by the control corresponding port with FPDP.

The utility model Temperature Humidity Sensor, contain the warning indicating circuit, adopt a LED luminotron to connect power supply by current-limiting resistance, the anodal collector output that connects a transistor amplifier of described luminotron, the grounded emitter of described transistor amplifier, its control base stage connects or one group of I/O output port of single-chip microcomputer.The out-put supply end of described power circuit is provided with the filter capacitor of ground connection.

Claims

1. Temperature Humidity Sensor, contain single-chip microcomputer and peripheral circuit, the digital Temperature and Humidity testing circuit, power circuit, serial communication circuit, power circuit provides working power for the sensor each several part, peripheral circuit comprises external clock, storer and input button, it is characterized in that: described digital Temperature and Humidity testing circuit adopts any chip of SHC1x or SHC7x series, the power end of digital Temperature and Humidity testing circuit chip connects the cathode output end of power circuit, the earth terminal ground connection of digital Temperature and Humidity testing circuit chip, its serial clock input end (SCK) is connected the corresponding I/O port of single-chip microcomputer with serial data end (DATA), its serial data end connects power end by pull-up resistor; Single-chip microcomputer is connected by corresponding PORT COM with serial communication circuit, realizes uplink communication.

2. Temperature Humidity Sensor according to claim 1, it is characterized in that: single-chip microcomputer adopts 89C2051, storer adopts integrated circuit (IC) chip MAX813, the read-write input port (WDI) of MAX813 connects an external interrupt input port of single-chip microcomputer, the reset terminal of MAX813 connects the reset terminal of single-chip microcomputer, and the master control reset terminal (MR) of MAX813 is connected with read-write output port (WDO).

3. Temperature Humidity Sensor according to claim 1 and 2, it is characterized in that: serial communication circuit adopts integrated circuit (IC) chip MAX485, MAX485 is connected single-chip microcomputer by the control corresponding port with FPDP, and power circuit out-put supply end is provided with the filter capacitor of ground connection.

4. Temperature Humidity Sensor according to claim 3, it is characterized in that: contain the warning indicating circuit, the warning indicating circuit adopts the LED luminotron to connect power supply by current-limiting resistance, the anodal collector output that connects transistor amplifier in the transistor amplifier circuit of described LED luminotron, the grounded emitter of described transistor amplifier, its control base stage connects or one group of I/O output port of single-chip microcomputer.