CN217585865U

CN217585865U - Wireless humiture recorder

Info

Publication number: CN217585865U
Application number: CN202220924495.7U
Authority: CN
Inventors: 崔小波; 钱静; 殷诚
Original assignee: Jiangsu Zheqin Technology Co ltd; Jiangnan University
Current assignee: Jiangsu Zheqin Technology Co ltd; Jiangnan University
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2022-10-14
Anticipated expiration: 2032-04-20

Abstract

The application discloses wireless humiture record appearance relates to embedded software development technical field, wireless humiture record appearance includes: the temperature and humidity acquisition circuit comprises a main control chip, a temperature and humidity acquisition circuit and a 2.4GHZ power amplifier expansion circuit; the temperature and humidity acquisition circuit is used for acquiring temperature and humidity information and sending the temperature and humidity information to the main control chip; the main control chip is electrically connected with the temperature and humidity acquisition circuit and the 2.4GHZ power amplifier expansion circuit and is used for processing the received temperature and humidity information; and the 2.4GHZ power amplifier expansion circuit is used for carrying out power amplification on the information received and sent by the main control chip. The problem that a wireless temperature and humidity recorder in the prior art is large in size and high in power consumption is solved; reached and to receive and send information and carried out the power amplifier through 2.4GHZ power amplifier expander circuit, and need not to set up large-scale antenna, reduced the volume of wireless humiture record appearance and the effect of consumption.

Description

Wireless humiture recorder

Technical Field

The utility model relates to a wireless humiture record appearance belongs to embedded software development technical field.

Background

At present, the existing humiture recorder mainly comprises a wired humiture recorder and a wireless humiture recorder adopting 433MHZ wireless communication. However, the wired temperature and humidity recorder is troublesome in wiring and greatly influenced by the use environment, and the wireless temperature and humidity recorder is limited by the 433MHZ antenna, generally has a large volume and high power consumption.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a wireless humiture record appearance for solve the problem that exists among the prior art.

In order to achieve the above purpose, the utility model provides a following technical scheme:

according to a first aspect, the embodiment of the utility model provides a wireless humiture record appearance is provided, wireless humiture record appearance includes: the temperature and humidity acquisition circuit comprises a main control chip, a temperature and humidity acquisition circuit and a 2.4GHZ power amplifier expansion circuit;

the temperature and humidity acquisition circuit is used for acquiring temperature and humidity information and sending the temperature and humidity information to the main control chip;

the main control chip is electrically connected with the temperature and humidity acquisition circuit and the 2.4GHZ power amplifier expansion circuit and is used for processing the received temperature and humidity information;

and the 2.4GHZ power amplifier expansion circuit is used for carrying out power amplification on the information received and sent by the main control chip.

Optionally, the temperature and humidity acquisition circuit sends the temperature and humidity information to the main control chip through an inter-integrated circuit IIC communication protocol.

Optionally, the pin output of the temperature and humidity acquisition circuit is a digital quantity, including a 12-bit humidity digital quantity and a 14-bit humidity digital quantity.

Optionally, the wireless humiture recorder further includes a storage circuit electrically connected to the main control chip, and the storage circuit is configured to store the humiture information.

Optionally, the storage circuit is a serial peripheral SPI FLASH storage chip.

Optionally, the SPI FLASH memory chip is W25Q64, and the W25Q64 supports a wide voltage of 2.7 to 3.6V.

Optionally, the wireless temperature and humidity recorder further comprises a signal transmitting circuit, and the signal transmitting circuit is a meander antenna.

Optionally, the 2.4GHZ power amplifier expansion circuit is an RFX2401C.

Optionally, a low-voltage monitoring device is arranged in the main control chip.

Optionally, the main control chip is CH579.

Through providing a wireless humiture record appearance, wireless humiture record appearance includes: the temperature and humidity acquisition circuit comprises a main control chip, a temperature and humidity acquisition circuit and a 2.4GHZ power amplifier expansion circuit; the temperature and humidity acquisition circuit is used for acquiring temperature and humidity information and sending the temperature and humidity information to the main control chip; the main control chip is electrically connected with the temperature and humidity acquisition circuit and the 2.4GHZ power amplifier expansion circuit and is used for processing the received temperature and humidity information; and the 2.4GHZ power amplifier expansion circuit is used for carrying out power amplification on the information received and sent by the main control chip. The problem that a wireless temperature and humidity recorder in the prior art is large in size and high in power consumption is solved; the effect that the received and sent information can be subjected to power amplification through the 2.4GHZ power amplification expansion circuit without arranging a large antenna and the volume and the power consumption of the wireless temperature and humidity recorder are reduced is achieved.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

Fig. 1 is a schematic circuit diagram of a wireless humiture recorder according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a main control chip according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a temperature and humidity acquisition circuit according to an embodiment of the present invention;

fig. 4 is a schematic circuit diagram of a memory circuit according to an embodiment of the present invention;

fig. 5 is a schematic circuit diagram of a signal transmitting circuit according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a possible 2.4GHZ power amplifier extension circuit according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, a schematic circuit structure diagram of a wireless humiture recording instrument according to an embodiment of the present application is shown, and as shown in fig. 1, the wireless humiture recording instrument includes: the temperature and humidity acquisition circuit comprises a main control chip 110, a temperature and humidity acquisition circuit 120 and a 2.4GHZ power amplifier expansion circuit 130;

the temperature and humidity acquisition circuit 120 is configured to acquire temperature and humidity information and send the temperature and humidity information to the main control chip 110;

the main control chip 110 is electrically connected with the temperature and humidity acquisition circuit 120 and the 2.4GHZ power amplifier expansion circuit 130, and is configured to process the received temperature and humidity information;

the 2.4GHZ power amplifier extension circuit 130 is configured to perform power amplification on the information received and transmitted by the main control chip 110.

A low-voltage monitoring device is arranged in the main control chip 110. The main control chip 110 is CH579. The chip integrates Bluetooth, a network port, a USB (Universal Serial Bus) host and a segment LCD (Liquid Crystal Display) screen, and is a domestic 32-bit microcontroller based on an ARM (Advanced RISC Machine) inner core. In practical implementation, the system dominant frequency of CH579 can reach 40MHz at most, and it uses 32-bit ARM Cortex-M0 as a kernel, and the chip supports ICP (in-circuit programming), ISP (in-system programming), and IAP (in-application programming), and supports bluetooth BLE (bluetooth Low Energy) and bluetooth 4.0 specification. In addition, CH579 does not need an external inductor, which simplifies the design of a PCB (Printed Circuit Board), and a manufacturer provides a protocol stack and an Application Programming Interface (API) for easier development and use by a developer, and the main control chip 110 supports 3.3V and 2.5V power supply. The chip is internally provided with a DC/DC converter, the current is 6mA when the power is transmitted by 0dBm, and low-voltage monitoring is also internally arranged, so that the chip is more friendly to batteries. The requirement of the design on low power consumption of the chip is met. Please refer to fig. 2, which illustrates a schematic structure diagram of a main control chip 110 being CH579.

The temperature and humidity acquisition circuit 120 sends the temperature and humidity information to the main control chip 110 through an inter-integrated circuit IIC communication protocol. The pin output of the temperature and humidity acquisition circuit 120 is digital quantity, including 12-bit humidity digital quantity and 14-bit humidity digital quantity. Of course, in actual implementation, the digit of the digital quantity output by the temperature and humidity acquisition circuit 120 may also be customized by a designer. For example, a humidity value of 8 bits and a temperature value of 12 bits are set. In practical implementation, the temperature and humidity acquisition circuit 120 may be an HTU21, please refer to fig. 3, which shows a possible circuit diagram of the temperature and humidity acquisition circuit 120.

In practical implementation, the wireless humiture recorder further includes a storage circuit 140140 electrically connected to the main control chip 110, and the storage circuit 140 is configured to store the humiture information. The memory circuit 140 is an SPI (Serial Peripheral Interface) FLASH memory chip. Memory circuit 140 may transmit data via the SPI communication protocol. In practical implementation, the SPI FLASH memory chip is W25Q64, and the W25Q64 supports a wide voltage of 2.7 to 3.6V. The W25Q64 chip partitions a block of memory space of 8 mbytes, and the space per operation is the smallest unit of 4 kbytes. While a minimum unit is erased prior to a write operation. Therefore, when the chip is used, the minimum memory space opened up each time is 4K, so that the SRAM needs to have more than 4K to operate normally. The maximum erasing frequency of the W25Q64 can reach 10W, the data written by the user can be stored for 20 years, the W25Q64 supports wide voltage of 2.7-3.6V, and the requirement on working voltage is low when a circuit is designed. Referring to fig. 4, a possible circuit diagram of the memory circuit 140 is shown.

The wireless temperature and humidity recorder further comprises a signal transmitting circuit 150150, and the signal transmitting circuit 150 is a meander antenna. The antenna length of the meander antenna is 1/4 or slightly more than 1/4 of the wavelength of the transmitted signal. The area of the PCB of the meander pattern antenna near the antenna is copper-coated and grounded, and no ground wire is arranged around the antenna, so that the PCB is required to be empty around the antenna. In this embodiment, the meander antenna is an inverted F-shape, and the antenna uses a wireless communication distance of about 100 meters for a PCB board-mounted antenna at 0dBm transmit power. Referring to fig. 5, a circuit diagram of the signal transmitting circuit 150 is shown.

The 2.4GHZ power amplifier expansion circuit 130 is RFX2401C. The RFX2401C can support the output of 20dBm (100 mW) power at the maximum, the effect is ideal in the actual remote test process, and the phenomenon of data packet loss does not occur. Moreover, the internal structure of the RFX2401C is simple, the RFX comprises a primary PA and an LNA which are switched through a logic control pin, wherein the maximum output of the PA supports +22dBm, the LNA has a noise coefficient of 2.5dB, 50 omega impedance matching is performed on an input/output port, the input/output port is packaged into a QFN with the thickness of 3X3mm, the RFX is very simple to use, and only a few of resistors and capacitors are arranged on the periphery. Referring to fig. 6, a schematic diagram of a possible 2.4GHZ power amplifier expansion circuit 130 is shown.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a wireless humiture record appearance which characterized in that, wireless humiture record appearance includes: the temperature and humidity acquisition circuit comprises a main control chip, a temperature and humidity acquisition circuit and a 2.4GHZ power amplifier expansion circuit;

and the 2.4GHZ power amplification expansion circuit is used for carrying out power amplification on the information received and sent by the main control chip.

2. The wireless temperature and humidity recorder of claim 1, wherein the temperature and humidity acquisition circuit sends the temperature and humidity information to the main control chip via an inter-integrated circuit (IIC) communication protocol.

3. The wireless temperature and humidity recorder according to claim 1, wherein the pin outputs of the temperature and humidity acquisition circuit are digital values, including a 12-bit humidity digital value and a 14-bit humidity digital value.

4. The wireless temperature and humidity recorder according to claim 1, further comprising a memory circuit electrically connected to the main control chip, wherein the memory circuit is configured to store the temperature and humidity information.

5. The wireless humiture recorder of claim 4, wherein the memory circuit is a serial peripheral SPI FLASH memory chip.

6. The wireless temperature and humidity recorder according to claim 5, wherein the SPI FLASH memory chip is W25Q64, and the W25Q64 supports a wide voltage of 2.7-3.6V.

7. The wireless humiture recording instrument according to any one of claims 1 to 6, further comprising a signal transmitting circuit, wherein the signal transmitting circuit is a meander antenna.

8. The wireless temperature and humidity recorder according to any one of claims 1 to 6, wherein the 2.4GHZ power amplifier extension circuit is RFX2401C.

9. The wireless humiture recording instrument according to any one of claims 1 to 6, wherein a low voltage monitoring device is arranged in the main control chip.

10. The wireless humiture recorder of any one of claims 1 to 6, wherein the main control chip is CH579.