CN113795033A - WIFI module test system - Google Patents
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- CN113795033A CN113795033A CN202111080159.5A CN202111080159A CN113795033A CN 113795033 A CN113795033 A CN 113795033A CN 202111080159 A CN202111080159 A CN 202111080159A CN 113795033 A CN113795033 A CN 113795033A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/06—Testing, supervising or monitoring using simulated traffic
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
- G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
Abstract
The invention discloses a WIFI module testing system which comprises a USB-to-serial port circuit, a display circuit, an LED driving circuit, a power circuit, a key indicating lamp circuit, a reset circuit, a main control module, a WIFI circuit and an EEPROM circuit, wherein the main control module comprises a chip U2, the display circuit, the LED driving circuit and the indicating lamp circuit are connected with the output end of the main control module, the key circuit, a crystal oscillator circuit, the reset circuit, the EEPROM circuit and the USB-to-serial port circuit are connected with the input end of the main control module, the WIFI circuit can be communicated with main control data in a bidirectional mode, the power circuit provides a stable 3.3V power supply for the system, the WIFI module testing system can transmit data to a plurality of slave devices at the same time, can compare a plurality of parameters when transmitting data, can use the LED to visually display signal transmission parameters, and has good market value.
Description
Technical Field
The invention relates to an intelligent device test system, in particular to a WIFI module test system.
Background
With the rapid development of technologies such as cloud computing, artificial intelligence and big data, intelligent hardware equipment begins to enter the production and life of people, although the form and application scene of the intelligent equipment are changed all the time, the requirement of internet access cannot be met, especially, the application of wireless connection to preparation equipment is wider, the wireless connection is usually applied to sending control instructions and transmitting cloud resources, and the wireless equipment is often used as a standard for judging whether the equipment is intelligent, so that the assembly and radio frequency performance detection of WIFI equipment become very important.
Disclosure of Invention
Aiming at the defects of the existing WIFI module testing mode, the invention provides the WIFI module testing system which can greatly shorten the testing period and can display data in real time.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a WIFI module test system, includes USB changes serial circuits, display circuit, LED drive circuit, power supply circuit, button pilot lamp circuit, reset circuit, host system, WIFI circuit, EEPROM circuit, host system includes chip U2, display circuit, LED drive circuit, pilot lamp circuit connect host system's output, button circuit, crystal oscillator circuit, reset circuit, EEPROM circuit, USB change serial circuits and connect host system's input, the WIFI circuit can be with the two-way intercommunication of master control data, power supply circuit provides stable 3.3V power for the system.
Further, the USB to serial port circuit includes a chip U1 and an interface P7, pin 4 of the chip U1 is connected to a 3.3V power supply, a first lead of pin 20 is connected to a 5V power supply through a resistor R5, a second lead is grounded through a resistor R58 and a capacitor C2, pin 15 of the chip U1 is connected to pin 3 of the interface P7, pin 1 of the interface P7 is connected to a 5V power supply, pin 5 is grounded, pin 2 of the interface P7 is connected to pin 16 of the chip U1, the model of the interface P7 is Micro USB, pin 17 of the chip U1 is connected to a 3.3V power supply, pins 25, 7, 18, 21 and 26 are grounded, a capacitor C1 is disposed between the 3.3V power supply and ground, pin 1 of the chip U1 is connected to a 3.3V power supply through a resistor R3, pin 23 is connected to a light emitting diode 4, pin 5V power supply through a resistor R3V 3, pin 4642 is connected to a light emitting diode 465V power supply, pin 7 is connected to a light emitting diode 5, the model of the chip U1 is C-FT232RL-VER 2.
Furthermore, the display circuit comprises a chip U7, pins 1, 7, 8, 10, 12, 16, 17, 21, 22, 23, 24, 25, 29 and 30 of the chip U7 are grounded, pin 2 of the chip U7 is connected to pin 3 of the chip U7 through a capacitor C24, pin 4 of the chip U7 is connected to pin 5 of the chip U7 through a capacitor C25, a first lead of pin 6 is grounded through resistors IICL and SPII, a second lead is connected to a 3.3V power supply, a third lead is grounded, capacitors C29 and C30 are connected in parallel and then arranged between a 3.3V power supply and ground, pin 11 of the chip U7 is grounded through a resistor SPII, pins 13, 14 and 15 are connected to pins 11, 12 and 13 of the chip U2, a first lead of pin 18 is connected to a 3.3V power supply through a resistor R12, a second lead is connected to pin 17 of the chip U2, pin 13, pin 5848 of the chip U7 is connected to pin 5819 of the chip U3919, and a first lead of the chip U3919 is connected to a resistor R20 of the chip U2 through a resistor R, R11 connects the 3.3V power, and the second lead connects through resistance R2 the pin 18 of chip U2, pin 26 of chip U7 is through resistance R1 ground connection, and pin 27 is through electric capacity C26 ground connection, and the first lead of pin 28 is through electric capacity C27 ground connection, and the second lead is through electric capacity C28 ground connection, the model of chip U7 is OLED.
Further, the LED driving circuit includes a chip U6, an interface CN1, and an interface CN2, a first lead of a pin 1 of the chip U6 is grounded through a resistor R21, a second lead is grounded through a resistor R23, a pin 2 of the chip U6 is grounded through a capacitor C21, a pin 3 is connected with a pin 1 of the interface CN2, resistors R25, R26, and R27 are connected in parallel and then disposed between a pin 3 of the chip U6 and a pin 1 of the interface CN2, a pin 4 of the chip U6 is connected with a pin 1 of the interface CN2, a pin 2 of the interface CN2 is grounded, the model of the interface CN2 is DB2EVM-5.08-2P, a pin 5 of the chip U6 is grounded through a capacitor C6, a pin 6 is connected with a pin 14 of the chip U6 through a resistor R6, a first lead of the pin 7 is grounded through a resistor R6, a second lead is grounded through a resistor R6, a capacitor C6, a pin of the chip U6 is grounded, a pin Q6 of the MOS 6, and a gate of the chip 6 is connected with the gate 368, the source of MOS pipe Q3 connects pin 1 of chip U6, the first lead of the drain-source resistance of MOS pipe Q3 is through diode D2, electric capacity C23 ground connection, the second lead is through inductance L2, electric capacity C20 ground connection, the third lead is through diode D4 connect pin 1 of interface CN1, pin 2 ground connection of interface CN1, the model of chip U6 is MT7285, the model of interface CN1 is DB2 EVM-5.08-2P.
Further, the power supply circuit comprises a chip U3, wherein pin 1 of the chip U3 is grounded, the first lead of pin 3 is connected with a 5V power supply, the second lead is grounded through a capacitor C6, the third lead is grounded through a capacitor C7, pin 4 of the chip U3 is grounded through a capacitor C8, the first lead of pin 2 is connected with a 3.3V power supply, the second lead is grounded through a capacitor C5, and the model of the chip U3 is AMS 1117-3.3.
Further, the key indicator lamp circuit comprises a key circuit and an indicator lamp circuit, the key circuit comprises keys K1 and K2, pin 2 of the key K1 is grounded through a resistor R2, pin 4 is connected with pin 1 of the key K1 through a capacitor C31, pin 3 is connected with a 3.3V power supply, pin 1 is connected with pin 16 of the chip U2 through a resistor R13, pin 2 of the key K2 is grounded through a resistor R14, pin 4 is connected with pin 1 of the key K2 through a capacitor C32, pin 3 is connected with a 3.3V power supply, pin 1 is connected with pin 17 of the chip U24 through a resistor R28, the indicator lamp circuit comprises an LED6, an LED7 and an LED 9, resistors R17 and an LED6 are connected in series and then arranged between the 3.3V power supply and the ground, resistors R18 and an LED7 are connected in series and then arranged between the 3.3V power supply and the pin 43 of the chip U2, and resistors R6867, 19 and the LED 2 are connected in series and the chip 2.
Further, the reset circuit comprises a reset switch SW1, wherein pin 1 of the switch SW1 is connected with a 3.3V power supply through a resistor R10, pin 2 is connected with the ground through a capacitor C15, and the input end of the reset switch SW1 is connected with pin 7 of the chip U2.
Further, the first lead of pin 1 of the chip U2 is connected to a 3.3V power supply, the second lead is connected to ground through a capacitor C3, pin 9 of the chip U2 is connected to ground through a capacitor C12, pins 23 and 35 are connected to ground, the first lead of pin 24 is connected to a 3.3V power supply, the second lead is connected to ground through a capacitor C14, the first lead of pin 48 of the chip U2 is connected to ground through a capacitor C4, the second lead is connected to a 3.3V power supply, pin 47 of the chip U2 is connected to ground, pin 44 is connected to ground through a resistor R9, the first lead of pin 36 is connected to a 3.3V power supply, the second lead is connected to ground through a capacitor C13, pins 37 and 34 of the chip U2 are respectively connected to pins 1 and 2 of the interface J1, pin 4 of the interface J1 is connected to a 3.3V power supply, pin 3 is connected to ground, the model of the interface J1 is a SWD interface, the model of the chip U1 is connected to ground through a capacitor C16, and the chip U2 is connected to ground, the crystal oscillator X2 is arranged between a pin 3 of the chip U2 and a pin 4 of the chip U2, pins 5 and 6 of the chip U2 are grounded through capacitors C18 and C19 respectively, the crystal oscillator X3 is arranged between the pin 5 of the chip U2 and the pin 6 of the chip U2, and the model of the chip U2 is STM32F103C8T 6.
Furthermore, the WIFI circuit comprises a chip U5 and a crystal oscillator X1, pins 1, 3 and 4 of the chip U5 are connected with a 3.3V power supply, a first lead of a pin 2 is connected with an antenna ANT1 through an inductor L4, a second lead is grounded through an inductor L4, pin 7 of the chip U5 is connected with a 3.3V power supply through a 10K resistor, pin 11 is connected with a 3.3V power supply, pin 12 is grounded through a resistor R16, pins 14 and 15 are respectively connected with a 3.3V power supply through a 10K resistor, pin 27 is connected with pin 4 of the crystal oscillator X1, pin 28 is connected with pin 2 of the crystal oscillator X1, pins 29 and 30 are connected with a 3.3V power supply, a first lead of pin 31 is grounded through a resistor R15, a second lead is connected with pin 28 of the chip U5 through a resistor R15 and a capacitor C9, the first lead of the pin 32 of the chip U5 is connected with a 3.3V power supply through a resistor of 10K, the second lead is connected with the ground through a capacitor C11, pin 33 of the chip U5 is grounded, and the model of the chip U5 is ESP8266 EX.
Furthermore, the EEPROM comprises a chip U4, pins 1, 2 and 3 of the chip U4 are respectively connected with pins 20, 22 and 19 of the chip U5, pin 4 is grounded, pins 5, 6 and 7 are respectively connected with pins 23, 21 and 18 of the chip U5, pin 8 is connected with a 3.3V power supply, and the model of the chip U4 is W25Q128 JVSSQTR.
Compared with the prior art, the invention has the beneficial effects that:
1. the WIFI module testing system can be connected with multiple paths of WIFI equipment for testing, and the testing speed of the WIFI module testing system cannot be influenced when the multiple paths of equipment are tested simultaneously;
2. the detected data can be displayed by a display screen, different connecting devices can be tested and compared, and the connecting devices with good performance can be selected more easily;
3. the system can freely switch two modes of master equipment and slave equipment, and can also use the two pieces of equipment to set different master modes and slave modes, so that the WIFI module testing system is tested;
4. the LED has three luminous LEDs with different colors of red, green and blue, and parameters such as signal intensity, power, transmission rate and the like can be visually judged.
Drawings
FIG. 1 is a schematic diagram of the principle structure of the USB-to-serial port circuit of the present invention;
FIG. 2 is a schematic diagram of a schematic structure of a display circuit according to the present invention;
FIG. 3 is a schematic diagram of the principle structure of the LED driving circuit of the present invention;
FIG. 4 is a schematic diagram of the schematic structure of the power circuit of the present invention;
FIG. 5 is a schematic diagram of the principle structure of the key indicating lamp circuit and the reset circuit of the present invention;
FIG. 6 is a schematic diagram of the principle structure of the master control module and the crystal oscillator circuit of the present invention;
fig. 7 is a schematic diagram of the principle structure of the WIFI circuit and the EEPROM circuit of the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. The preferred embodiments of the present invention are shown in the drawings, but the present invention may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in detail below with reference to the accompanying drawings.
In this embodiment, USB changes serial ports circuit and adopts the FT232 chip, communicates with the host computer through the USB interface, when carrying out serial ports communication, thereby the pilot lamp can twinkle and show data transmission state.
In the embodiment, the OLED display circuit is composed of an OLED display screen and peripheral circuits thereof, the signal lines are CS, RST, D/C, D0 and D1, wherein D0 and D1 are respectively connected with two 4.7K pull-up resistors to protect the circuit.
In the present embodiment, the LED driving circuit: the size of WIFI signal transmission parameters is reflected through the LED driving circuit, when the transmission rate is high, the output power of the LED is increased, otherwise, the output power of the LED is decreased; and other transmission parameters such as the transmission power of the equipment can be adjusted.
In the embodiment, the system power supply is composed of a 5V power supply and a 3.3V linear power supply, and the chip AMS1117-3.3 steps down the 5V power supply to the 3.3V power supply for the whole system.
In this embodiment, the key circuit may set the terminal as a master device or a slave device, and set the wireless signal test parameter, and the indicator light circuit may check the system operation state.
In this embodiment, the reset circuit is composed of three elements, namely a key, a resistor and a capacitor, and when the key is pressed down, the main control chip sends out a reset instruction, so that the system is restarted.
In this embodiment, the crystal oscillator circuit provides a clock signal for the system.
In this embodiment, the WIFI circuit is composed of a chip ESP8266EX and its peripheral circuits, and by configuring parameters of the chip ESP8266EX, it is possible to rapidly switch between sleep/wake-up modes, where the WIFI transmission power is 2.4G-5G, and multiple wireless standards are supported.
In the present embodiment, the EEPROM circuit is mainly responsible for storing the monitoring data, in particular the non-volatile data.
The working principle of the invention is as follows: the system can set a master mode and a slave mode through the key circuit, when the system is set as the master device, the system can be connected with a plurality of slave devices to carry out WIFI signal transmission, when the WIFI signal transmission is carried out, a plurality of parameters can be set through the key circuit to carry out comparison, and parameters such as signal intensity, power, speed and the like can be judged through the output power of the LED; when the system is set as a slave device, parameters such as transmission signal strength, output power, speed and the like of the system can be detected by the master device; the two modes of the invention can conveniently and quickly carry out various network tests.
The technical features mentioned above are combined with each other to form various embodiments which are not listed above, and all of them are regarded as the scope of the present invention described in the specification; also, modifications and variations may be suggested to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The WIFI module testing system is characterized by comprising a USB-to-serial port circuit, a display circuit, an LED driving circuit, a power circuit, a key indicating lamp circuit, a reset circuit, a main control module, a WIFI circuit and an EEPROM circuit, wherein the main control module comprises a chip U2, the display circuit, the LED driving circuit and the indicating lamp circuit are connected with the output end of the main control module, the key circuit, a crystal oscillator circuit, the reset circuit, the EEPROM circuit and the USB-to-serial port circuit are connected with the input end of the main control module, the WIFI circuit can be in bidirectional intercommunication with main control data, and the power circuit provides a stable 3.3V power supply for the system.
2. A WIFI module testing system according to claim 1, characterized in that the USB to serial port circuit includes a chip U1, an interface P7, pin 4 of the chip U1 connects to 3.3V power, a first lead of pin 20 connects to 5V power through a resistor R5, a second lead connects to ground through a resistor R58 and a capacitor C2, pin 15 of the chip U1 connects to pin 3 of the interface P7, pin 1 of the interface P7 connects to 5V power, pin 5 connects to ground, pin 2 of the interface P7 connects to pin 16 of the chip U1, the model of the interface P7 is Micro USB, pin 17 of the chip U1 connects to 3.3V power, pins 25, 7, 18, 21, 26 connect to ground, a capacitor C1 is set between 3.3V power and ground, pin 1 of the chip U1 connects to 3.3V power through a resistor R6, a light emitting diode 92, and a resistor R635V power, pin 3V power supply terminal 3.8 connects to ground, the pin 22 is connected with a 5V power supply through a resistor R7 and a light emitting diode LED5, and the model of the chip U1 is C-FT232RL-VER 2.
3. A WIFI module testing system according to claim 1, characterized in that said display circuit includes a chip U7, pins 1, 7, 8, 10, 12, 16, 17, 21, 22, 23, 24, 25, 29, 30 of said chip U7 are grounded, pin 2 of said chip U7 is connected to pin 3 of said chip U7 through a capacitor C24, pin 4 of said chip U7 is connected to pin 5 of said chip U7 through a capacitor C25, a first pin of pin 6 is grounded through resistors IICL and SPII, a second pin is connected to 3.3V power, a third pin is grounded, capacitors C29 and C30 are connected in parallel and disposed between 3.3V power and ground, pin 11 of said chip U7 is grounded through a resistor SPII, pins 13, 14, 15 are connected to pins 11, 12, 13 of said chip U2, a first pin of pin 18 is connected to 3.3V power through a resistor R12, a second pin is connected to pin 8545 of said chip U7, and pin 8519 of said chip U828920, the first lead of the pin 20 of the chip U7 is connected with a 3.3V power supply through resistors R2 and R11, the second lead is connected with the pin 18 of the chip U2 through a resistor R2, the pin 26 of the chip U7 is grounded through a resistor R1, the pin 27 is grounded through a capacitor C26, the first lead of the pin 28 is grounded through a capacitor C27, the second lead is grounded through a capacitor C28, and the model of the chip U7 is OLED.
4. A WIFI module testing system according to claim 1, characterized in that the LED driving circuit includes a chip U6, an interface CN1, and an interface CN2, a first lead of pin 1 of the chip U6 is grounded through a resistor R21, a second lead is grounded through a resistor R23, pin 2 of the chip U6 is grounded through a capacitor C21, pin 3 is grounded through pin 1 of the interface CN2, resistors R25, R26, and R27 are connected in parallel and disposed between pin 3 of the chip U6 and pin 1 of the interface CN2, pin 4 of the chip U6 is grounded through pin 1 of the interface CN2, pin 2 of the interface 686cn 9 is grounded, the model of the interface CN2 is DB2 m-5.08-2P, pin 5 of the chip U6 is grounded through a capacitor C22, pin 6 is grounded through a resistor R24 to pin 14 of the chip U2, a first lead of the interface CN 6957 is grounded through a resistor R20, and a second lead through a resistor R22 and a capacitor C22, pin 9 of the chip U6 is grounded, pin 8 is connected to the gate of the MOS transistor Q3, the source of the MOS transistor Q3 is connected to pin 1 of the chip U6, the first lead of the drain of the MOS transistor Q3 is grounded via a diode D2 and a capacitor C23, the second lead is grounded via an inductor L2 and a capacitor C20, the third lead is connected to pin 1 of the interface CN1 via a diode D4, pin 2 of the interface CN1 is grounded, the model of the chip U6 is MT7285, and the model of the interface CN1 is DB2 EVM-5.08-2P.
5. A WIFI module testing system according to claim 1, characterized in that the power circuit includes a chip U3, pin 1 of the chip U3 is grounded, the first lead of pin 3 is grounded to 5V power, the second lead is grounded to capacitor C6, the third lead is grounded to capacitor C7, pin 4 of the chip U3 is grounded to capacitor C8, the first lead of pin 2 is grounded to 3.3V power, the second lead is grounded to capacitor C5, model AMS of the chip U3 is AMS 7-3.3.
6. The WIFI module testing system of claim 1, the key indicating lamp circuit comprises a key circuit and an indicating lamp circuit, the key circuit comprises keys K1 and K2, pin 2 of the key K1 is grounded through a resistor R2, pin 4 is connected with pin 1 of the key K1 through a capacitor C31, pin 3 is connected with a 3.3V power supply, pin 1 is connected with pin 16 of the chip U2 through a resistor R13, pin 2 of the key K2 is grounded through a resistor R14, pin 4 is connected with pin 1 of the key K2 through a capacitor C32, pin 3 is connected with a 3.3V power supply, pin 1 is connected with pin 17 of the chip U2 through a resistor R28, the indicating lamp circuit comprises an LED6, an LED7 and an LED8, wherein a resistor R17 and an LED6 are connected in series and then are arranged between a 3.3V power supply and the ground, a resistor R18 and an LED7 are connected in series and then are arranged between the 3.3V power supply and a pin 43 of a chip U2, and a resistor R19 and an LED8 are connected in series and then are arranged between the 3.3V power supply and a pin 42 of the chip U2.
7. A WIFI module testing system according to claim 1, characterized in that said reset circuit includes a reset switch SW1, pin 1 of said switch SW1 is connected to 3.3V power supply via resistor R10, pin 2 is connected to ground via capacitor C15, and the input of said reset switch SW1 is connected to pin 7 of said chip U2.
8. A WIFI module testing system as claimed in claim 1, wherein the first pin of pin 1 of the chip U2 is connected to 3.3V power, the second pin is connected to ground via capacitor C3, pin 9 of the chip U2 is connected to ground via capacitor C12, pins 23 and 35 are connected to ground, the first pin of pin 24 is connected to 3.3V power, the second pin is connected to ground via capacitor C14, the first pin of pin 48 of the chip U2 is connected to ground via capacitor C4, the second pin is connected to 3.3V power, pin 47 of the chip U2 is connected to ground, pin 44 is connected to ground via resistor R9, the first pin of pin 36 is connected to 3.3V power, the second pin is connected to ground via capacitor C13, pins 37 and 34 of the chip U2 are connected to pins 1 and 2 of the interface J1, pin 4 of the interface J1 is connected to 3.3V power, pin 3 is connected to ground, the interface 1 is of swj 2, and the chip U4833 is connected to ground via capacitor C16, pin 4 of the chip U2 is grounded through a capacitor C17, a crystal oscillator X2 is arranged between pin 3 of the chip U2 and pin 4 of the chip U2, pins 5 and 6 of the chip U2 are grounded through capacitors C18 and C19 respectively, the crystal oscillator X3 is arranged between pin 5 of the chip U2 and pin 6 of the chip U2, and the model of the chip U2 is STM32F103C8T 6.
9. A WIFI module testing system as claimed in claim 1, wherein said WIFI circuit includes a chip U5, a crystal oscillator X1, said chip U5 has pins 1, 3, 4 connected to 3.3V power, pin 2 has a first lead connected to antenna ANT1 via inductor L4, a second lead connected to ground via inductor L4, said chip U5 has pin 7 connected to 3.3V power via 10K resistor, pin 11 connected to 3.3V power, pin 12 connected to ground via resistor R16, pins 14, 15 connected to 3.3V power via 10K resistor, pin 27 connected to pin 4 of said crystal oscillator X1, pin 28 connected to said crystal oscillator X1, pins 29, 30 connected to 3.3V power, pin 31 has a first lead connected to ground via resistor R15, a second lead connected to pin 28 of said chip U5 via resistor R15, capacitor C9, said chip U5 has a first lead connected to ground via 10K resistor R3V power, pin 3V power via capacitor C11, pin 33 of the chip U5 is grounded, and the model of the chip U5 is ESP8266 EX.
10. A WIFI module testing system according to claim 1, characterized in that said EEPROM includes a chip U4, pins 1, 2, 3 of said chip U4 are connected to pins 20, 22, 19 of said chip U5, pin 4 is connected to ground, pins 5, 6, 7 are connected to pins 23, 21, 18 of said chip U5, pin 8 is connected to 3.3V power supply, and said chip U4 is W25Q128 jvsqtr.
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CN113092827A (en) * | 2021-05-12 | 2021-07-09 | 湖北师范大学 | Electronic component testing system and method based on virtual instrument |
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