GY-521 Module with Mesh devices

Troubleshooting
1

I have a Particle Argon, and was trying to interface the GY 521 module with it. As a test i modified the example code, however i am not getting anything on the console. Any thoughts what i am doing wrong?

// This #include statement was automatically added by the Particle IDE.
#include "MPU6050.h"

int ledPin = D7;

// MPU variables:
MPU6050 accelgyro;
int16_t ax, ay, az;
int16_t gx, gy, gz;


bool ledState = false;
void toggleLed() {
    ledState = !ledState;
    digitalWrite(ledPin, ledState);
}

void setup() {
    pinMode(ledPin, OUTPUT);
    accelgyro.initialize();


}

void loop() {
    // read raw accel/gyro measurements from device
    accelgyro.getMotion6(&ax, &ay, &az, &gx, &gy, &gz);
   
   /* Serial.print("a/g:\t");
    Serial.print(ax); Serial.print("\t");
    Serial.print(ay); Serial.print("\t");
    Serial.print(az); Serial.print("\t");
    Serial.print(gx); Serial.print("\t");
    Serial.print(gy); Serial.print("\t");
    Serial.println(gz);*/
    
    Particle.publish("LOOP", PRIVATE);
    Particle.publish("AX", String(ax), PRIVATE);
    
    
}
2

Can’t say about the sensor, but your publishes will most likely violate the rate limit of max. 4/second.
After the first four events your device will be silenced.

3

Thanks for the reply, i was gonna add a 5 seconds delay. However, i am not able to flash my code. I am using the WEB IDE, and although my Argon is connected and showing its connected to the cloud, the WEB IDE is showing it as offline. Any idea why?

image

4

You can put the device in Safe Mode or flash via USB.

5

Thanks! Putting into safe Mode did the trick. But not the delay

void loop() {
    // read raw accel/gyro measurements from device
    accelgyro.getMotion6(&ax, &ay, &az, &gx, &gy, &gz);
   
   /* Serial.print("a/g:\t");
    Serial.print(ax); Serial.print("\t");
    Serial.print(ay); Serial.print("\t");
    Serial.print(az); Serial.print("\t");
    Serial.print(gx); Serial.print("\t");
    Serial.print(gy); Serial.print("\t");
    Serial.println(gz);*/
    
    Particle.publish("LOOP", PRIVATE);
    Particle.publish("AX", String(ax), PRIVATE);
    
    delay(5000);
}

console just stops here

image
image1070×477 36.8 KB

6

From the console it show offline … SO something happened somewhere - my goto test is this - flash it and make sure local output works, console works and led blinks. Not great code but a quick sanity check!

SYSTEM_THREAD(ENABLED);

ApplicationWatchdog wd(30000, System.reset);

SerialLogHandler logHandler(LOG_LEVEL_WARN, // Logging level for non-application messages
{ 
    { "app", LOG_LEVEL_ALL } // Logging level for application messages
});


int led = D7;
const int delayTime =  10000; //

//--------------------------------------------------------------------
void setup() 
//--------------------------------------------------------------------
{
  const char str_deviceOS[] = "DeviceOS";
  const int sizeOfTempText = 128;
  char tempText[sizeOfTempText];

  Serial.begin(115200);
  waitFor(Serial.isConnected, 30000);

  Log.info("Started.....waiting for Cloud");
  if (waitFor(Particle.connected, 30000)) {
    Log.info("Started at %s", Time.timeStr().c_str());
  }
  else {
    Log.info("Started.....no Cloud");
  }
  snprintf(tempText, sizeOfTempText, "%s", System.version().c_str());
  Log.info("%s %s", str_deviceOS, tempText);
  Particle.publish(str_deviceOS, tempText, PRIVATE);

  pinMode(led, OUTPUT);

  pinMode(PWR, INPUT);
  pinMode(CHG, INPUT);
}

//--------------------------------------------------------------------
void loop() 
//--------------------------------------------------------------------
{
    wd.checkin(); // resets the AWDT count
    Serial.println(Time.timeStr()); //
    
    digitalWrite(led, !digitalRead(led));
    checkBattV();
    checkBattC();
    checkVUSB();
    delay(delayTime);
}

// ------------------------------------------------------------------------------
float checkBattV()
// ------------------------------------------------------------------------------
{   
    float battVoltage = analogRead(BATT) * 0.0011224;
    Particle.publish("battery_voltage", String::format("%.2f",battVoltage), PUBLIC);
    Log.info("Batt level:%.2fV",battVoltage);
    return battVoltage;
}
// ------------------------------------------------------------------------------
bool checkBattC()
// ------------------------------------------------------------------------------
{   
    bool charging = !digitalRead(CHG);
    Particle.publish("battery_charging", charging ? "yes" : "no", PUBLIC);
    Log.info("Batt %s charging", charging ? "is" : "not");
    return charging;
}
// ------------------------------------------------------------------------------
bool checkVUSB() 
// ------------------------------------------------------------------------------
{
    bool powerState = digitalRead(PWR);
    Log.warn(powerState ? "Power ON" : "Power FAIL");
    Particle.publish("power_state", powerState ? "on" : "off", PUBLIC);
    return powerState;
}
7

Here you go

image
image1058×641 52.3 KB

8

ok so you now know your device is ok, the cloud is ok and the console is ok.

So comment out sections of your code until it works - I would start with this and add back in code until it fails …

Make the last line of your setup() a publish so you know the loop() will start next


void setup() {

// your start-up stuff

 Particle.publish("DEBUG", "setup() done", PRIVATE);

void loop() {
    // read raw accel/gyro measurements from device
    //accelgyro.getMotion6(&ax, &ay, &az, &gx, &gy, &gz);
   
   /* Serial.print("a/g:\t");
    Serial.print(ax); Serial.print("\t");
    Serial.print(ay); Serial.print("\t");
    Serial.print(az); Serial.print("\t");
    Serial.print(gx); Serial.print("\t");
    Serial.print(gy); Serial.print("\t");
    Serial.println(gz);*/
    
    Particle.publish("DEBUG", loop()", PRIVATE);
    //Particle.publish("AX", String(ax), PRIVATE);
    
    delay(5000);
}

]
You should now have 5s message - then add back the serial.prints and check local serial output (making sure you have the vars ax/y/z and gx/y/z defined somewhere.

What happens?

9

Hey @jrjack, looking at the GY-521, it communicates via I2C, for that you need to initiate it first. I would take the original code you posted, and in the setup() add the line Wire.begin().

And secondly, as @ScruffR pointed out, add some delay to your publishing messages.

1 Like
10

thank you so much @muneebr1 Seems to be working now :smiley:

image
image1064×562 35.5 KB