CN217037469U

CN217037469U - Remote data transmission system based on ESP12-S module

Info

Publication number: CN217037469U
Application number: CN202220852200.XU
Authority: CN
Inventors: 黄石原; 陈晓宁; 季宏强; 江抚顺; 沈浩; 孙明健
Original assignee: Anhui University
Current assignee: Anhui University
Priority date: 2022-04-14
Filing date: 2022-04-14
Publication date: 2022-07-22
Anticipated expiration: 2032-04-14

Abstract

The utility model discloses a remote data transmission system based on an ESP12-S module, which comprises an MCU main control module, an AC/DC switching power supply module, a DC/DC voltage reduction module, an LDO voltage reduction module, an RS485 module and a WiFi module, wherein the RS485 module comprises an RS485 communication circuit and an RS485 sensor; the MCU master control module controls the RS485 sensor to collect and receive data through the RS485 communication circuit, meanwhile, the ESP-12S module is provided with the WiFi module, communication with an upper computer is achieved under the WiFi environment, the data collected by the RS485 sensor is processed and sent to the upper computer, remote real-time monitoring of environmental data is achieved, the MCU master control module has the functions of remote data collection and transmission, is simple in structure and can be adapted to most industrial sensors, and the MCU master control module has the advantages of being simple in operation, remote in distance and low in cost.

Description

Remote data transmission system based on ESP12-S module

Technical Field

The utility model relates to the technical field of data transmission, in particular to a remote data transmission system based on an ESP12-S module.

Background

Data transmission is the transmission of data from a data source to a data terminal via one or more data links according to a certain protocol, and its main function is to realize the transmission and exchange of information between points, a good data transmission mode can improve the real-time and reliability of data transmission, and a data transmission system usually consists of a transmission channel and data circuit terminating equipment (DCE) at both ends of the channel, and in some cases, also includes multiplexing equipment at both ends of the channel, and the transmission channel can be a dedicated communication channel, and can also be provided by a data exchange network, a telephone exchange network or other types of exchange networks.

Most of the existing remote data transmission systems are complex in structure and difficult to operate, cannot realize remote real-time transmission and monitoring of environmental data, cannot adapt to most industrial sensors, and is high in operation cost, so that the utility model provides a remote data transmission system based on an ESP12-S module to solve the problems in the prior art.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present invention provides a remote data transmission system based on an ESP12-S module, which solves the problems of complex structure, difficult operation and incapability of real-time remote data transmission in the existing remote data transmission system.

In order to achieve the purpose of the utility model, the utility model is realized by the following technical scheme: a remote data transmission system based on an ESP12-S module comprises an MCU main control module, an AC/DC switching power supply module, a DC/DC voltage reduction module, an LDO voltage reduction module, an RS485 module and a WiFi module, wherein the RS485 module comprises an RS485 communication circuit and an RS485 sensor, the AC/DC switching power supply module is connected with mains supply and converts 220V/50Hz alternating current accessed into the system into 12V/5A direct current, the DC/DC voltage reduction module reduces the 12V/5A direct current into 5V/5A direct current, the LDO voltage reduction module reduces the 5V/5A direct current into 3.3V/5A direct current and supplies power to the RS485 module and the MCU main control module, the MCU main control module adopts a-12S module, the ESP-12S module controls the RS485 sensor to collect data through an ESP 485 communication circuit, the WiFi module is loaded on the MCU main control module and sends the sensor data received by the MCU main control module to the upper computer.

The further improvement lies in that: the circuit efficiency of the AC/DC switching power supply module is more than or equal to 80%, the frequency is 47 Hz-63 Hz, the output voltage is 11.6V-12.6V, the output current is 5A, and the AC/DC switching power supply module comprises a rectifying circuit, a filtering circuit, a frequency increasing circuit, a voltage reducing circuit and a feedback circuit.

The further improvement is that: the rectifier circuit comprises a fuse, a common-mode inductor, a safety capacitor and a rectifier bridge, the filter circuit is a capacitor, the fuse carries out short-circuit protection on 220V/50Hz alternating current accessed by the AC/DC switching power supply module, the common-mode inductor and the safety capacitor filter common-mode and differential-mode interference signals in a power grid, the rectifier bridge rectifies the filtered alternating current, and the capacitor carries out filtering and voltage stabilization on the rectified current.

The further improvement lies in that: the DC/DC voltage reduction module is a switch type voltage reduction converter chip MP2315, the switch type voltage reduction converter chip MP2315 is packaged by TSOT23-8, the highest efficiency is 94%, the maximum input voltage is 24V, and the maximum output current is 3A.

The further improvement lies in that: the LDO voltage reduction module is a linear voltage regulation chip AMS1117-3.3, and the linear voltage regulation chip AMS1117-3.3 converts 5V voltage into 3.3V voltage for the use of the MCU main control module and the RS485 communication circuit.

The further improvement lies in that: the ESP-12S module is integrated with a 32-bit Tensilica processor, a standard digital peripheral interface, an antenna switch, a radio frequency balun, a power amplifier, a low noise amplifier, a filter and a power supply management module, and the working temperature range of the ESP-12S module is-40 ℃ to +125 ℃.

The utility model has the beneficial effects that: the utility model takes an MCU main control module as a core, and combines an AC/DC switching power supply module, a DC/DC voltage reduction module, an LDO voltage reduction module, an RS485 module and a WiFi module to form a complete data transmission system, wherein the MCU main control module controls an RS485 sensor to collect data and receive the data through an RS485 communication circuit, meanwhile, the ESP-12S module is provided with the WiFi module, the communication with an upper computer is realized in a WiFi environment, the data collected by the RS485 sensor is processed and sent to the upper computer, the remote real-time monitoring of environmental data is realized, the remote data acquisition and transmission function is realized, the structure is simple, the remote data acquisition and transmission function is adaptive to most industrial sensors, and the remote data transmission system has the advantages of simple operation, remote distance and low cost.

Drawings

FIG. 1 is a schematic diagram of the circuit structure of the system of the present invention;

FIG. 2 is a schematic diagram of the 5V to 3.3V circuit of the present invention;

FIG. 3 is a flow chart of the present invention for sending data to an upper computer.

Detailed Description

In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.

According to fig. 1, 2 and 3, the embodiment provides a remote data transmission system based on an ESP12-S module, which includes an MCU main control module, an AC/DC switching power module, a DC/DC voltage-reducing module, an LDO voltage-reducing module, an RS485 module and a WiFi module, the system selects 220V/50Hz mains supply for power supply so as to be used in any places with electricity, the RS485 module includes an RS485 communication circuit and an RS485 sensor, the RS485 communication circuit has the advantages of stable system operation and high communication rate, the AC/DC switching power module is connected with the mains supply and converts the 220V/50Hz AC power accessed into the system into 12V/5A DC power to realize low voltage conversion and improve power conversion efficiency, the DC/DC voltage-reducing module reduces the 12V/5A DC power into 5V/5A DC power to realize large voltage difference voltage stabilization, the LDO voltage reduction module reduces 5V/5A direct current into 3.3V/5A direct current to realize small voltage reduction and voltage stabilization, the schematic diagram of a circuit from 5V to 3.3V is shown in figure 2, an ESP-12S module is adopted by an MCU main control module, the ESP-12S module controls an RS485 sensor to collect and receive data through an RS485 communication circuit, a WiFi module is loaded on the MCU main control module and sends the sensor data received by the MCU main control module to an upper computer, the WiFi module supports a standard IEEE802.111b/g/n protocol, a complete TCP/IP protocol stack is built in, the WiFi module supports STA, AP and STA + AP action modes, a built-in 10-bit high-precision ADC supports smart config, an AirKiss one-key network and a plurality of ESP modes, deep dormancy current is as low as 20uA, a general AT command can be quickly used, and in a WiFi environment, the 12-S module can be connected to a local WiFi network through a program, therefore, the connection between the lower computer and the upper computer is realized, and the purpose of remote data transmission is achieved.

The circuit efficiency of the AC/DC switching power supply module is more than or equal to 80%, the frequency is 47 Hz-63 Hz, the output voltage is 11.6V-12.6V, the output current is 5A, and the AC/DC switching power supply module comprises a rectifying circuit, a filter circuit, a frequency boosting circuit, a voltage reducing circuit and a feedback circuit.

The rectifying circuit comprises a fuse, a common-mode inductor, a safety capacitor and a rectifying bridge, wherein the filter circuit is a capacitor, after 220V alternating current mains supply enters an AC/DC switching power supply module circuit, firstly, 250V/3.15A fuse is used for carrying out short-circuit protection, common-mode and differential-mode interference signals in a power grid are filtered by the common-mode inductor and the safety capacitor, then, KBP307 rectifying bridge is used for rectifying, and after alternating current is rectified, filtering and voltage stabilization are realized by a large capacitor of 450V/100uF, wherein firstly, the starting voltage is provided for OB2269, and secondly, a power supply is provided for a subsequent voltage reduction circuit;

the frequency boosting circuit is realized around an OB2269 integrated control chip, when the input voltage of the system changes, the current flowing through a VIN end through a starting resistor also changes, and the OB2269 integrated control chip automatically realizes compensation by detecting the change value, so that the OCP curve of the system in a wider input voltage range is relatively flat, and the purpose of constant power output is achieved;

the step-down circuit is realized by surrounding a high-frequency transformer, pins 1 and 3 of the high-frequency transformer are primary side windings, pins 8 and 11 of the high-frequency transformer are secondary side windings, pins 4 and 6 of the high-frequency transformer are auxiliary windings, the turn ratio of the three windings is 84:13:3, the secondary side output is connected to an output port through a pi-type filter circuit, and the auxiliary side output is rectified by a diode FR107 and stabilized by a capacitor to provide a stable power supply for an OB2269 chip;

the feedback circuit is realized by combining a TL431 voltage-stabilizing triode and a PC817B photoelectric coupler with a resistor capacitor, when the output voltage of the switching power supply is higher than a rated value, voltage division is carried out through a resistor RL1, the reference voltage of the TL431 is higher than the internal reference voltage, the voltage of the cathode is grounded, the voltage of two sides of an internal LED of the PC817 is lightened when reaching the rated value, the voltage of a collector of a switching tube on the other side is driven to be reduced, an OB2269 feedback pin FB is connected with a collector pin of a PCB17, the voltage of the FB pin is reduced, the oscillation period is increased, the switching frequency is reduced, the output is reduced, and the feedback effect is achieved.

The DC/DC buck module is a switch type buck converter chip MP2315, the switch type buck converter chip MP2315 is packaged by TSOT23-8, the highest efficiency is 94%, the maximum input voltage is 24V, and the maximum output current is 3A.

The LDO voltage reduction module is a linear voltage stabilization chip AMS1117-3.3, and the linear voltage stabilization chip AMS1117-3.3 converts 5V voltage into 3.3V voltage for the use of the MCU main control module and the RS485 communication circuit.

The ESP-12S module is integrated with a 32-bit Tensiica processor, a standard digital peripheral interface, an antenna switch, a radio frequency balun, a power amplifier, a low noise amplifier, a filter and a power management module, only few peripheral circuits are needed, the occupied PCB space can be reduced, the working temperature range of the ESP-12S module is-40 ℃ to +125 ℃, the ESP-12S module has an ultra-wide working temperature range, stable performance can be kept, and the ESP-12S module can adapt to various operating environments.

The remote data transmission system adopts 220V standard commercial power to supply power, after the commercial power enters the system, the AC/DC switching power supply module converts 220V/50Hz alternating current into 12V/5A direct current which is commonly used to realize power supply to the industrial grade RS485 sensor, the DC/DC voltage reduction module and the LDO voltage reduction module sequentially reduce the 12V direct current into 5V and 3.3V, the power supply is also provided for the RS485 communication circuit and the MCU main control module, the MCU main control module adopts an ESP-12S module, the ESP-12S module controls the RS485 sensor to collect data and receive the data through the RS485 communication circuit, and meanwhile, the WiFi module loaded on the ESP-12S module, the communication with the host computer can be realized under the wiFi environment, and the data that gather the RS485 sensor are sent for the host computer through handling, realize remote real-time transmission and monitoring to environmental data.

The working process of the system transmitting data to the upper computer software is shown in figure 3, firstly, a WiFi module is networked through a WiFi wireless network in the environment, a judgment statement is added to judge whether the system is connected to the wireless network or not, if the system is not connected, the networking operation is circularly carried out, the next step of operation is carried out after the network is known to be connected, the equipment is connected to the Aliyun Internet of things platform through the three elements obtained on the Aliyun Internet of things platform, meanwhile, the judgment is carried out, after the Aliyun Internet of things platform is ensured to be connected, the processed decimal environment data is sent to the Aliyun through an MQTT protocol, and after the single chip microcomputer obtains the data of a sensor, the data is sent to the Aliyun server through the wireless network in a long-distance mode in time, then the Aliyun Internet of things platform displays an interface to sense various measured data, therefore, remote transmission and monitoring of environmental data by a user are realized.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A remote data transmission system based on an ESP12-S module is characterized in that: comprises an MCU main control module, an AC/DC switching power supply module, a DC/DC voltage reduction module, an LDO voltage reduction module, an RS485 module and a WiFi module, the RS485 module comprises an RS485 communication circuit and an RS485 sensor, the AC/DC switching power supply module is connected with the mains supply and converts the 220V/50Hz alternating current accessed into the system into 12V/5A direct current, the DC/DC voltage reduction module reduces the 12V/5A direct current into 5V/5A direct current, the LDO voltage reduction module reduces the direct current of 5V/5A to the direct current of 3.3V/5A and supplies power for the RS485 module and the MCU main control module, the MCU master control module adopts an ESP-12S module, the ESP-12S module controls the RS485 sensor to collect data and receive the data through the RS485 communication circuit, the WiFi module is loaded on the MCU main control module and sends the sensor data received by the MCU main control module to the upper computer.

2. The ESP12-S module-based remote data transmission system according to claim 1, wherein: the circuit efficiency of the AC/DC switching power supply module is more than or equal to 80%, the frequency is 47 Hz-63 Hz, the output voltage is 11.6V-12.6V, the output current is 5A, and the AC/DC switching power supply module comprises a rectifying circuit, a filtering circuit, a frequency increasing circuit, a voltage reducing circuit and a feedback circuit.

3. The ESP12-S module-based remote data transmission system according to claim 2, wherein: the rectifier circuit comprises a fuse, a common-mode inductor, a safety capacitor and a rectifier bridge, the filter circuit is a capacitor, the fuse carries out short-circuit protection on 220V/50Hz alternating current accessed by the AC/DC switching power supply module, the common-mode inductor and the safety capacitor filter common-mode and differential-mode interference signals in a power grid, the rectifier bridge rectifies the filtered alternating current, and the capacitor carries out filtering and voltage stabilization on the rectified current.

4. The ESP12-S module-based remote data transmission system according to claim 1, wherein: the DC/DC voltage reduction module is a switch type voltage reduction converter chip MP2315, the switch type voltage reduction converter chip MP2315 is packaged by TSOT23-8, the highest efficiency is 94%, the maximum input voltage is 24V, and the maximum output current is 3A.

5. The ESP12-S module-based remote data transmission system according to claim 1, wherein: the LDO voltage reduction module is a linear voltage stabilization chip AMS1117-3.3, and the linear voltage stabilization chip AMS1117-3.3 converts 5V voltage into 3.3V voltage and supplies the MCU main control module and an RS485 communication circuit.

6. The ESP12-S module-based remote data transmission system according to claim 1, wherein: the ESP-12S module is integrated with a 32-bit Tensilica processor, a standard digital peripheral interface, an antenna switch, a radio frequency balun, a power amplifier, a low noise amplifier, a filter and a power supply management module, and the working temperature range of the ESP-12S module is-40 ℃ to +125 ℃.