ESP8266 Community Forum

- Sun Nov 13, 2016 4:05 pm #58097 Hi,

I'm using the NodeMCU and Arduino Plattform to acquire Sensor Data and send it to my PC via Wifi like this:

I am sending the recorded every 50 ms but after some minutes my program crashes and I get the feeling that has something to do with the ESP beeing overwhelmed by the amount of data I am sending.

Is there a chance of increasing the sending rate so the module can process/send the data faster?

Thanks, Niklas

- Mon Nov 14, 2016 8:54 am #58127 Code, please?

- Mon Nov 14, 2016 10:50 am #58138 I doubt it is the amount of data that causing the crashes, since ESP is able to send a 180K SPIFFS file within 4 seconds. So unless your data chunks are bigger than that, the problem is elsewhere.

- Thu Nov 17, 2016 10:03 am #58255 First I am Connecting to the Wifi (I am creating Ad-hoc Network on my PC) then I am creating the server and connecting to client. Then i am initialising the MPU6050.

Code: Select allvoid setup() {
    Serial.begin(115200);
    Serial.println();
    Serial.println();
    Serial.print("Connecting to ");
    Serial.println(ssid);

    WiFi.begin(ssid, password);

   

    while (WiFi.status() != WL_CONNECTED) {
       delay(500);
       Serial.print(".");
    }
    Serial.println("");
    Serial.println("WiFi connected");
 
    // Start the server
    server.begin();
    Serial.println("Server started");

     delay(1000);

     Serial.println(WiFi.localIP());

     connectClient();

 
// join I2C bus (I2Cdev library doesn't do this automatically)
    #if I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE
        Wire.begin(4, 5);
        Wire.setClock(400000); // 400kHz I2C clock. Comment this line if having compilation difficulties
    #elif I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_FASTWIRE
        Fastwire::setup(400, true);
    #endif

    // initialize serial communication
    // (115200 chosen because it is required for Teapot Demo output, but it's
    // really up to you depending on your project)
    Serial.begin(115200);
    while (!Serial); // wait for Leonardo enumeration, others continue immediately

    // NOTE: 8MHz or slower host processors, like the Teensy @ 3.3v or Ardunio
    // Pro Mini running at 3.3v, cannot handle this baud rate reliably due to
    // the baud timing being too misaligned with processor ticks. You must use
    // 38400 or slower in these cases, or use some kind of external separate
    // crystal solution for the UART timer.

    // initialize device
    Serial.println(F("Initializing I2C devices..."));
    mpu.initialize();
    pinMode(INTERRUPT_PIN, INPUT);

    // verify connection
    Serial.println(F("Testing device connections..."));
    Serial.println(mpu.testConnection() ? F("MPU6050 connection successful") : F("MPU6050 connection failed"));

    // load and configure the DMP
    Serial.println(F("Initializing DMP..."));
    devStatus = mpu.dmpInitialize();

    // supply your own gyro offsets here, scaled for min sensitivity
    mpu.setXGyroOffset(220);
    mpu.setYGyroOffset(76);
    mpu.setZGyroOffset(-85);
    //mpu.setXAccelOffset(-2000);
    mpu.setYAccelOffset(-1810);
    mpu.setZAccelOffset(1270); // 1688 factory default for my test chip
    mpuInterrupt = false;
    fifoCount = 0;
     
    // make sure it worked (returns 0 if so)
    if (devStatus == 0) {
        // turn on the DMP, now that it's ready
        Serial.println(F("Enabling DMP..."));
        mpu.setDMPEnabled(true);

        // enable Arduino interrupt detection
        Serial.println(F("Enabling interrupt detection (Arduino external interrupt 0)..."));
        attachInterrupt(digitalPinToInterrupt(INTERRUPT_PIN), dmpDataReady, RISING);
        mpuIntStatus = mpu.getIntStatus();

        // set our DMP Ready flag so the main loop() function knows it's okay to use it
        Serial.println(F("DMP ready! Waiting for first interrupt..."));
        dmpReady = true;

        // get expected DMP packet size for later comparison
        packetSize = mpu.dmpGetFIFOPacketSize();
    } else {
        // ERROR!
        // 1 = initial memory load failed
        // 2 = DMP configuration updates failed
        // (if it's going to break, usually the code will be 1)
        Serial.print(F("DMP Initialization failed (code "));
        Serial.print(devStatus);
        Serial.println(F(")"));
    }

The Loop, I am acquiring Data from the MPU6050 first, then sending it to the client.

Code: Select allvoid loop() {
    // wait for MPU interrupt or extra packet(s) available
    while (!mpuInterrupt && fifoCount < packetSize) {
     
      }

    // reset interrupt flag and get INT_STATUS byte
    mpuInterrupt = false;
    mpuIntStatus = mpu.getIntStatus();

    // get current FIFO count
    fifoCount = mpu.getFIFOCount();

    // check for overflow (this should never happen unless our code is too inefficient)
    if ((mpuIntStatus & 0x10) || fifoCount == 1024) {
        // reset so we can continue cleanly
        mpu.resetFIFO();
        Serial.println("FiFO Overflow");
    // otherwise, check for DMP data ready interrupt (this should happen frequently)
    } else if (mpuIntStatus & 0x02) {
        // wait for correct available data length, should be a VERY short wait
        while (fifoCount < packetSize) fifoCount = mpu.getFIFOCount();

        // read a packet from FIFO
        mpu.getFIFOBytes(fifoBuffer, packetSize);
       
        // track FIFO count here in case there is > 1 packet available
        // (this lets us immediately read more without waiting for an interrupt)
        fifoCount -= packetSize;

        mpu.dmpGetAccel(&aa, fifoBuffer);
        /*
        mpu.dmpGetAccel(&aa, fifoBuffer);
        gravityX = aa.x / 8192.0;
        gravityY = aa.y / 8192.0;
        gravityZ = aa.z / 8192.0;
        tmp = tmp + String(gravityX) + " " + String(gravityY) + " " + String(gravityZ) + " ";
        */

        // display Euler angles in degrees
        mpu.dmpGetQuaternion(&q, fifoBuffer);
        mpu.dmpGetGravity(&gravity, &q);
        mpu.dmpGetYawPitchRoll(ypr, &q, &gravity);

        mpu.dmpGetLinearAccel(&aaReal, &aa, &gravity);

        tmp = String(aa.x) + " " + String(aa.y) + " " + String(aa.z) + " " + String(ypr[0]) + " " + String(ypr[1]) + " " + String(ypr[2]) + " " + String(aaReal.x) + " " + String(aaReal.y) + " " + String(aaReal.z) + "\r\n";
        //tmp = String(aa.x) + " " + String(aa.y) + " " + String(aa.z) + " " + String(aaReal.x) + " " + String(aaReal.y) + " " + String(aaReal.z) + "\r\n";
       
        client.print(tmp);
        //delay(20);
        Serial.print(tmp);
    }
}