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

Abstract

The utility model discloses a remote data transmission system based on an ESP12-S module, comprising an MCU main control module, an AC/DC switching power supply module, a DC/DC step-down module, an LDO step-down module, an RS485 module and a WiFi module. The RS485 module includes an RS485 communication circuit and an RS485 sensor; the MCU main control module of the present invention controls the RS485 sensor to collect and receive data through the RS485 communication circuit, and at the same time, the ESP-12S module has a WiFi module, which can communicate with the host computer in a WiFi environment. The data collected by the RS485 sensor is processed and sent to the host computer to realize long-distance real-time monitoring of environmental data. It has the function of remote data acquisition and transmission, and the structure is simple and can be adapted to most industrial-grade sensors. , The advantages of long distance and low cost.

Description

A 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 technique

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

Most of the existing remote data transmission systems are complex in structure and difficult to operate. They cannot realize long-distance real-time transmission and monitoring of environmental data, and cannot be adapted to most industrial-grade sensors, and the operating cost is relatively high. Therefore, the present invention proposes a A remote data transmission system based on ESP12-S module is used to solve the problems existing in the prior art.

Utility model content

In view of the above problems, the purpose of the present utility model is to propose a remote data transmission system based on the ESP12-S module, which solves the problems of complex structure, difficult operation and inability to realize real-time remote data transmission in the existing remote data transmission system.

In order to achieve the purpose of the present utility model, the present utility model is realized through the following technical solutions: a remote data transmission system based on the ESP12-S module, comprising an MCU main control module, an AC/DC switching power supply module, a DC/DC step-down module, LDO step-down module, RS485 module and WiFi module, the RS485 module includes RS485 communication circuit and RS485 sensor, the AC/DC switching power supply module is connected to the mains and converts the 220V/50Hz AC power connected to the system into 12V/5A Direct current, the DC/DC step-down module reduces the 12V/5A direct current to 5V/5A direct current, and the LDO step-down module reduces the 5V/5A direct current to 3.3V/5A direct current and is the main source of the RS485 module and MCU. The MCU main control module adopts the ESP-12S module. The ESP-12S module controls the RS485 sensor to collect and receive data through the RS485 communication circuit. The WiFi module is loaded on the MCU main control module and the MCU main control The sensor data received by the module is sent to the upper computer.

A further improvement is that: the circuit efficiency of the AC/DC switching power supply module is greater than or equal to 80%, the frequency is 47Hz-63Hz, the output voltage is 11.6V-12.6V, and the output current is 5A, and the AC/DC switching power supply module includes a rectifier. circuit, filter circuit, boost circuit, step-down circuit and feedback circuit.

A further improvement is that: the rectifier circuit includes a fuse, a common mode inductor, a safety capacitor and a rectifier bridge, the filter circuit is a capacitor, and the fuse performs short-circuit protection for the 220V/50Hz alternating current connected to the AC/DC switching power supply module, The common mode inductor and safety capacitor filter common mode and differential mode interference signals in the power grid, the rectifier bridge rectifies the filtered alternating current, and the capacitor filters and stabilizes the rectified current.

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

A further improvement is that the LDO step-down module is a linear voltage regulator chip AMS1117-3.3, which converts the 5V voltage to 3.3V and is used by the MCU main control module and the RS485 communication circuit.

A further improvement is: the ESP-12S module integrates 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 management module. The operating temperature range of the 12S module is -40°C to +125°C.

The beneficial effects of the utility model are: the utility model takes the MCU main control module as the core, and combines the AC/DC switching power supply module, the DC/DC step-down module, the LDO step-down module, the RS485 module and the WiFi module to form a complete data transmission module In the system, the MCU main control module controls the RS485 sensor to collect and receive data through the RS485 communication circuit. At the same time, the ESP-12S module has its own WiFi module, which realizes the communication with the host computer in the WiFi environment, and passes the data collected by the RS485 sensor. It is processed and sent to the host computer to realize remote real-time monitoring of environmental data. It has the function of remote data acquisition and transmission, and the structure is simple and can be adapted to most industrial-grade sensors. It has the advantages of simple operation, long distance and low cost.

Description of drawings

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

Fig. 2 is the 5V to 3.3V circuit schematic diagram of the present utility model;

Fig. 3 is the flow chart of the present utility model sending data to the upper computer.

Detailed ways

In order to deepen the understanding of the present utility model, the present utility model will be described in further detail below with reference to the embodiments. The present embodiment is only used to explain the present utility model and does not constitute a limitation on the protection scope of the present utility model.

According to FIG. 1, FIG. 2, and FIG. 3, this embodiment provides a remote data transmission system based on the ESP12-S module, including an MCU main control module, an AC/DC switching power supply module, a DC/DC step-down module, LDO step-down module, RS485 module and WiFi module, the system is powered by 220V/50Hz mains power, so that it can be used in any place where there is electricity. The RS485 module includes RS485 communication circuit and RS485 sensor. The RS485 communication circuit has stable system operation, The advantage of high communication rate, the AC/DC switching power supply module is connected to the mains and converts the 220V/50Hz alternating current connected to the system into 12V/5A direct current to realize low-voltage power conversion and improve power conversion efficiency, DC/DC step-down module The 12V/5A DC power is reduced to 5V/5A DC power to achieve large voltage drop voltage regulation. The LDO step-down module reduces the 5V/5A DC power to 3.3V/5A DC power to achieve small voltage drop voltage regulation. The schematic diagram of the 3.3V circuit is shown in Figure 2. The MCU main control module adopts the ESP-12S module. The ESP-12S module controls the RS485 sensor to collect and receive data through the RS485 communication circuit. The WiFi module is loaded on the MCU main control module and the MCU is the main control module. The sensor data received by the control module is sent to the host computer. The WiFi module supports the standard IEEE802.11b/g/n protocol and has a built-in complete TCP/IP protocol stack. The precision ADC supports smart config, AirKiss one-key network, supports multiple sleep modes, the deep sleep current is as low as 20uA, and the general AT command can be used quickly. In the WiFi environment, the ESP12-S module can be connected to the local WiFi network through the program , so as to realize the connection between the lower computer and the upper computer, and achieve the purpose of remote data transmission.

The circuit efficiency of the AC/DC switching power supply module is greater than or equal to 80%, the frequency is 47Hz~63Hz, the output voltage is 11.6V~12.6V, and the output current is 5A. The AC/DC switching power supply module includes a rectifier circuit, a filter circuit, and an up-frequency circuit. , step-down circuit and feedback circuit.

The rectifier circuit includes a fuse, a common mode inductor, a safety capacitor and a rectifier bridge. The filter circuit is a capacitor. After the 220V AC mains enters the AC/DC switching power supply module circuit, the 250V/3.15A fuse is first used for short-circuit protection. The common mode inductor and safety capacitor filter the common mode and differential mode interference signals in the power grid. Next, the KBP307 rectifier bridge is used for rectification. After the AC rectification, a 450V/100uF large capacitor realizes the filtering and voltage regulation. OB2269 provides the turn-on voltage, and the second is to provide power for the subsequent step-down circuit;

The up-conversion circuit is implemented around the OB2269 integrated control chip. When the input voltage of the system changes, the current flowing through the VIN terminal through the start-up resistor will also change. The OCP curve in a wide input voltage range is relatively flat, achieving the purpose of constant power output;

The step-down circuit is implemented around a high-frequency transformer. Pins 1 and 3 of the high-frequency transformer are primary windings, pins 8 and 11 are secondary windings, and pins 4 and 6 are auxiliary windings. The turns ratio of the three windings is 84:13. :3, the secondary side output is connected to the output port through a π-type filter circuit, and the auxiliary side output is rectified by a diode FR107 and regulated by a capacitor to provide a stable power supply for the OB2269 chip;

The feedback circuit is realized by TL431 voltage regulator transistor and PC817B photocoupler combined with resistor and capacitor. When the output voltage of the switching power supply is higher than the rated value, the voltage is divided by the resistor RL1, so that the reference electrode voltage of TL431 is higher than the internal reference voltage, and the cathode voltage is grounded. , when the voltage on both sides of the internal LED of PC817 reaches the rated value, the voltage of the collector on the other side of the switch tube is reduced, and the feedback pin FB of OB2269 is connected to the collector pin of PCB17. The voltage of the FB pin decreases, which will increase the oscillation period. If it is large, the switching frequency will drop, which will reduce the output, so as to achieve the function of feedback.

The DC/DC buck module is a switching buck converter chip MP2315. The switching buck converter chip MP2315 is packaged in TSOT23-8, with a maximum efficiency of 94%, a maximum input voltage of 24V, and a maximum output current of 3A.

The LDO step-down module is a linear voltage regulator chip AMS1117-3.3. The linear voltage regulator chip AMS1117-3.3 converts the 5V voltage into 3.3V and is used by the MCU main control module and the RS485 communication circuit.

The ESP-12S module integrates a 32-bit Tensilica processor, standard digital peripheral interfaces, antenna switches, RF baluns, power amplifiers, low-noise amplifiers, filters and power management modules. The PCB space occupied is reduced, and the operating temperature range of the ESP-12S module is -40°C to +125°C. It has an ultra-wide operating temperature range, can maintain stable performance, and can adapt to various operating environments.

The remote data transmission system uses 220V standard mains power for power supply. After the mains power enters the system, the 220V/50Hz alternating current is converted into the commonly used 12V/5A direct current through the AC/DC switching power supply module to realize the power supply to the industrial-grade RS485 sensor. Then, the 12V direct current is reduced to 5V and 3.3V in turn through the DC/DC step-down module and the LDO step-down module, and supplies power to the RS485 communication circuit and the MCU main control module. The MCU main control module adopts ESP-12S module, ESP-12S module The RS485 sensor is controlled by the RS485 communication circuit to collect and receive data. At the same time, the WiFi module loaded on the ESP-12S module can communicate with the host computer in the WiFi environment, and the data collected by the RS485 sensor is processed and sent to the host computer. Real-time transmission and monitoring of long-distance environmental data.

The system transmits data to the host computer software as shown in Figure 3. First, the WiFi module is connected to the network through the WiFi wireless network in the environment, and a judgment statement is added to determine whether the system has been connected to the wireless network. If not, the network will be cyclically connected. The next step is to connect the device to the Alibaba Cloud IoT platform through the three elements obtained on the Alibaba Cloud IoT platform, and also make judgments to ensure that it has been connected to Alibaba Cloud. After the IoT platform, the processed decimal environment data is sent to Alibaba Cloud through the MQTT protocol, and every time the microcontroller obtains the sensor data, it sends the data to the Alibaba Cloud server remotely through the wireless network in a timely manner. The Alibaba Cloud IoT platform will display an interface to display various data measured by the sensor, so as to realize the remote transmission and monitoring of environmental data by users.

The basic principles, main features and advantages of the present invention have been shown and described above. It should be understood by those skilled in the art that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention The new model will also have various changes and improvements, which all fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

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 ℃.

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