Delay in sending data over wifiNINA (arduino nano 33 iot)

[micro_s]

Hello. I am trying to send data from an Arduino board (Nano 33 IoT) to a PC by creating a server on the board and a client on the PC. The board uses a WiFiNINA chip to connect to WiFi.

I have noticed that the board takes some time to send readings, although it should be sending data regularly. I plotted the data points it sent me against time. The plot shows a cluster of data 1 to 2 seconds apart. There is some data sent between these clusters. The data rate in between these clusters may be too slow for my application since I need live data.

What is happening, and is there a way to fix it?

image:

code:

/*/
https://support.arduino.cc/hc/en-us/articles/360014905179-How-to-Create-a-simple-web-server-with-static-IP-and-control-builtinLED-using-WiFiNINA-library
https://www.arduino.cc/reference/en/libraries/wifinina/server.write/
https://www.arduino.cc/reference/en/libraries/wifinina/server.write/
https://learn.adafruit.com/adafruit-bno055-absolute-orientation-sensor/arduino-code

 //*/



#include <SPI.h>
#include <WiFiNINA.h>

#define SECRET_SSID ""
#define SECRET_PASS ""

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BNO055.h>
#include <utility/imumaths.h>


int Calibrated=0;


Adafruit_BNO055 bno = Adafruit_BNO055(55);


IPAddress ip(192, 168, 137, 13);


///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID;        // your network SSID (name)
char pass[] = SECRET_PASS;    // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0;                // your network key index number (needed only for WEP)


int led =  LED_BUILTIN;
int status = WL_IDLE_STATUS;


WiFiServer server(80);


void setup() {
  //Initialize serial and wait for port to open:
  Serial.begin(9600);
 
  // Initialise the BNO055 sensor
  Serial.println("Initialise the BNO055 sensor");
  if(!bno.begin())
  {
    /* There was a problem detecting the BNO055 ... check your connections */
    Serial.print("Ooops, no BNO055 detected ... Check your wiring or I2C ADDR!");
    while(1);
  }
  delay(1000);
  bno.setExtCrystalUse(true);


  Serial.println("Access Point Web Server");


  pinMode(led, OUTPUT);      // set the LED pin mode


  // check for the WiFi module:
  if (WiFi.status() == WL_NO_MODULE) {
    Serial.println("Communication with WiFi module failed!");
    // don't continue
    while (true);
  }
 
  WiFi.config(ip);


  String fv = WiFi.firmwareVersion();
  if (fv < WIFI_FIRMWARE_LATEST_VERSION) {
    Serial.println("Please upgrade the firmware");
  }


  // by default the local IP address will be 192.168.4.1
  // you can override it with the following:
  // WiFi.config(IPAddress(10, 0, 0, 1));


  // print the network name (SSID);
  Serial.print("Creating access point named: ");
  Serial.println(ssid);


  // start the web server on port 80
   status = WiFi.begin(ssid, pass);
  if ( status != WL_CONNECTED) {
    Serial.println("Couldn't get a WiFi connection");
    while(true);
  }else {
  server.begin();
  }


  // you're connected now, so print out the status
  printWiFiStatus();
}




void loop() {
  if (Calibrated == 0){
   //*
    uint8_t sys, gyro, accel, mg =0;
    bno.getCalibration(&sys, &gyro, &accel, &mg);//0-> uncalibrated, 3-> best calibration
    //note calibrate gyro-keep bno still
    //     calibrate magnetometer figure of 8 movment
    //     callibrate ccelerometer move hold(3seconds) move hold...


    String calibrationSteing;
    String parameerNameSys="sys: ";
    String parameerNameGyo=" gyro: ";
    String parameerNameAccl=" accl: ";
    String parameerNameMag=" mg: ";
    calibrationSteing= parameerNameSys+sys+parameerNameGyo+gyro+parameerNameAccl+accel+parameerNameMag+mg+"$";


    const char* calibrationConstant;
    calibrationConstant=calibrationSteing.c_str();
 
    int n;
    n=calibrationSteing.length();


    server.write(calibrationConstant,n);
    Serial.println(calibrationSteing);
 
    if (sys == 3 && gyro == 3  && mg == 3){
     Calibrated=1;
    }
    //*/

  }else{
    //* Get a new sensor event 
    imu::Quaternion q = bno.getQuat();
    q.normalize();
    imu::Vector<3> euler = q.toEuler();
    euler.x() *= -180/M_PI;
    euler.y() *= -180/M_PI;
    euler.z() *= -180/M_PI;
    if (euler.x() < 0)
      euler.x() += 360;
  //*/
    String comboString;
    String x="X: ";
    String y=" Y: ";
    String z=" Z: ";
    comboString= x+euler.x()+y+euler.y()+z+euler.z()+"$";
    const char* comboConstant;
    comboConstant=comboString.c_str();
  
    int n;
    n=comboString.length();

    //server.println(comboConstant);
    server.write(comboConstant,n);
    Serial.println(comboString);
  }
  //delay(30);

}


void printWiFiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());


  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

}

[J-M-L]

hello

please edit your post using the in the tool bar just below your post

select the code part and press the <code/> icon in the tool bar to mark it as code. (also make sure you indented the code in the IDE before copying, that’s done by pressing ctrlT on a PC or cmdT on a Mac)

➜ do yourself a favour and please read How to get the best out of this forum

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there are some latency issues in GitHub