Real-Time Gait Sensor analysis using TCP

[StephenJohn]

I am currently working on a gait sensor analysis system. I am using a circuit with esp8266 and mpu6050. The data from the sensor must be wirelessly transmitted via TCP protocol to labview to display 10 gait parameters on one waveform chart in real-time. Please see the VI that I have been working on, however I need advice on whether I am going in the right direction with my approach in order to move forward.

[GerdW]

Hi Stephen,

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@StephenJohn wrote:

Please see the VI that I have been working on

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Which VI?

When attaching your VI I recommend to downconvert the VI before uploading (File->Save for previous).

I prefer LV2019, others may like LV2021 or older…

[StephenJohn]

I am currently creating a tcp server vi to receive information data from a circuit with esp8266 and mpu6050 to display one gait parameter on a waveform chart. Firstly I programmed the esp8266 using the following code and a connection failed output: 

#include <ESP8266WiFi.h>

#include <Wire.h>

#include <Adafruit_MPU6050.h>

// Wi-Fi credentials

const char* ssid = "Galaxy A32960C";

const char* password = "sqzl3356";

// LabVIEW TCP server address and port

const char* serverAddress = "192.168.108.98"; // Change to your LabVIEW TCP server IP address

const int serverPort = 34908; // Change to your LabVIEW TCP server port

WiFiClient client;

Adafruit_MPU6050 mpu;

void setup() {

  Serial.begin(115200);

  delay(100);

  // Connect to Wi-Fi

  Serial.println();

  Serial.println("Connecting to WiFi");

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

  Serial.println("\nWiFi connected");

  // Initialize MPU6050

  if (!mpu.begin()) {

    Serial.println("Sensor init failed");

    while (1)

      yield();

  }

  Serial.println("Found an MPU-6050 sensor");

}

void loop() {

  // Read accelerometer data

  sensors_event_t a, g, temp;

  mpu.getEvent(&a, &g, &temp);

  // Connect to the LabVIEW TCP server if not connected

  if (!client.connected()) {

    Serial.print("Connecting to ");

    Serial.print(serverAddress);

    Serial.print(" on port ");

    Serial.println(serverPort);

    if (client.connect(serverAddress, serverPort)) {

      Serial.println("Connected to server");

    } else {

      Serial.println("Connection failed");

      return;

    }

  }

  // Send accelerometer X data to LabVIEW

  String dataToSend = String(a.acceleration.x, 1); // Convert float to String with one decimal place

  client.println(dataToSend);

  // Debug message to verify data sent over network

  Serial.print("Sent data to server: ");

  Serial.println(dataToSend);

  delay(1000); // Adjust delay as needed

}

On the labview end, I have created a VI with the following blocks in order: tcp create listener, tcp wait on listener, tcp read, scan from string, string to number then waveform chart. Please help me to figure out a way to get the circuit to successful connect to labview to display data as required.

[cordm]

If you get "Connection failed" log entries it could mean for example

- the listener port in LabVIEW is incorrect

- the IP address of the LabVIEW server is incorrect

- a firewall is preventing an incoming connection

Here is what the VI should look like:

[StephenJohn]

What are good ways to rectify these issues that may arise:

If you get "Connection failed" log entries it could mean for example

- the listener port in LabVIEW is incorrect

- the IP address of the LabVIEW server is incorrect

- a firewall is preventing an incoming connection

[StephenJohn]

Please note that I am tasked with a gait sensor analysis system. It will consist of seven circuits each containing a battery, mpu6050 and esp8266 each measuring 10 gait parameters to connect to a labview server vi to display gait parameters on waveform charts, one chart for each circuit. How to create this VI?

[StephenJohn]

Which function is connected to the waveform block?

[GerdW]

Hi Stephen,

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@StephenJohn wrote:

Which function is connected to the waveform block?

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Are you asking for "which function delivers the data for the waveform chart"?

It's a function to convert a string (pink wire) into numeric data (orange wire), so you should look inside the string palette…

Btw. it's a snippet in the previous message! You can drag&drop snippets into a block diagram as they actually contain code…

[cordm]

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@StephenJohn wrote:

What are good ways to rectify these issues that may arise:

If you get "Connection failed" log entries it could mean for example

- the listener port in LabVIEW is incorrect

- the IP address of the LabVIEW server is incorrect

- a firewall is preventing an incoming connection

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- use the same port number on the Arduino side (where it says "// Change to your LabVIEW TCP server port" in the source code) and on the LabVIEW side (the little blue box at the beginning of my snippet)

- find out the IP address of your LabVIEW-server and change it in the source code (where it says "// Change to your LabVIEW TCP server IP address")

- also make sure arduino and server are connected to the same network

- If you have Windows Defender Firewall, search for "allow apps" in start menu, which leads you here and allow LabVIEW to communicate. There should have been a prompt when you try listening for network connections with LabVIEW though. If you use anything else, check with your IT guys.

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@StephenJohn wrote:
Please note that I am tasked with a gait sensor analysis system. It will consist of seven circuits each containing a battery, mpu6050 and esp8266 each measuring 10 gait parameters to connect to a labview server vi to display gait parameters on waveform charts, one chart for each circuit. How to create this VI?

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You will have one loop that waits for incoming connections. Upon client connect, use start asynchronous call to launch a VI that handles the communication. That VI sends received to a display VI, by e.g. using a queue. The display VI can be the one that contains the incoming connection listener.

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@StephenJohn wrote:
Which function is connected to the waveform block?

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Frac/exp string to numer. If you download the image (using the download button - right click saving does not work, at least not in firefox), you can drag it onto your block diagram and have it decoded into LabVIEW nodes. It is called a snippet, because it contains LabVIEW metadata.

You send a string like "1.2\r\n" over the TCP connection. .println appends \r\n to the string, which is why I used CRLF mode for TCP read.

[StephenJohn]

How to modify this VI to display 6 parameters on the one waveform chart?