Invalid data without Reset while initializing the begin about gy521

[mdjavedakhtar]

i am using SWire instead of Wire so will do the needed changed and let you know after test latter today

[RobTillaart]

It is rather late now, will check later this week - I did not encounter this problem yet.

Solution should be to add a wakeup() call in begin()

something like

bool GY521::begin()
{
  _wire->begin();
  if (isConnected())
  {
    return wakeup();
  }
  return false;
}

ESP -begin() too of course.

[RobTillaart]

From Datasheet

Problem might be caused by the SLEEP or the CYCLE bit being set.

Can you read the register and post its content (hex value?)

[RobTillaart]

(TEMP_DIS = disable temp sensor, seems less relevant)

[mdjavedakhtar]

Will surely post in sometime. Not near laptop now and it's 1:35am here
And yes I also think it's related to sleep / cycle bit

I have tested this with 3 different modules and all ware same

[RobTillaart]

If time permits I make a PR tomorrow. Have a good night!

[RobTillaart]

started with PR in https://github.com/RobTillaart/GY521/tree/develop
(also updating build-CI ++)

update: build successful,
Can you please verify if this branch for you works as expected?

[RobTillaart]

I noticed that in the examples I used a loop around wakeup()
That might be a solution if the single wakeup() call is not enough.

  Wire.begin();

  delay(100);
  while (sensor.wakeup() == false)
  {
    Serial.print(millis());
    Serial.println("\tCould not connect to GY521");
    delay(1000);
  }

[mdjavedakhtar]

I noticed that in the examples I used a loop around wakeup() That might be a solution if the single wakeup() call is not enough.

  Wire.begin();

  delay(100);
  while (sensor.wakeup() == false)
  {
    Serial.print(millis());
    Serial.println("\tCould not connect to GY521");
    delay(1000);
  }

This works fine.