Reconnecting after a few days: How long until I see the board?

Comments

• bestname

  July 2015

  As per the discussion on another page, I have disconnected the battery and connected the device by USB only. After restarting the phone, the device connects. 

  
  

  One solution to this problem where the battery discharges completely is to add a hardware switch to disconnect the battery when not active. 
• Laura

  July 2015

  bestname,

  Thanks for the feedback and update!
• bestname

  July 2015 edited July 2015

  And now the device does not show up at all. I am powering via computer USB, which worked fine yesterday. Board only, no attachments. Have not added the batter back yet, HW switch or no.

  
  

  I cannot get the board to show up at all. Restarted BT, restarted device, nothing at all.

  
  

  What is the solution? New metawear device?
• bestname

  August 2015

  Hello, I still cannot see the board. Any support? If you are shy you can PM me
• Laura

  August 2015 edited August 2015

  Did you try using different devices to connect to it? An Android phone, an iPhone, or a table, or a combination of devices?

  Also did you check if it was in the MetaBoot state?
  

  
  
• Laura

  August 2015

  Also did you try to hold down the switch when plugging it into USB.  That will force MetaBoot so you can reflash the MetaWear with the MetaWear Apps.
• bestname

  August 2015 edited August 2015

  Hi,

  
  

  I ordered some new boards and again this morning I had trouble connecting to one of them. I am recording accelerometer data with high frequency: I suspect there is some bug in the code keeping it running when I disconnect from the device and that this is draining the battery on the device.

  
  

  I was able to see the board again by following directions I found in a youtube video:

  - connect the usb power briefly to the metawear
  

  - disconnect the usb power

  - immediately reconnect the usb power

  - wait 1hr

  
  

  After doing this I was able to see and connect to the device. 

  
  

  The first device (on USB power) does not broadcast at all. 
• Laura

  August 2015

  bestname,

  
  

  We can do board exchanges for free if you want to (just send me an email).

  
  

  When you first get your board, they are put in a low power sleep mode (for shipping transportation purposes) and it requires a plug-in + plug-out + plug-in of the usb power to get it out of that sleep mode; this could have been what you were experiencing (the board was simply in low power transport/shipping mode).

  
  

  If you set the accelerometer data to log then it will keep doing it until you either reset the board or send it a command to stop logging; this could have very well been draining your battery as you had mentioned and could have tripped it to go into the low power sleep shipping/transport mode.
• bestname

  August 2015

  Hi Laura, 

  
  

  To clarify: the first board was working fine at first.

  
  

  Even now, although I have kept the (new) MW device plugged in by cable almost all day, it is not broadcasting. Perhaps that is because I unplugged it briefly (<30s).

  
  

  How can I definitively verify that the device has stopped logging and is in a power saving mode? 
• bestname

  August 2015

  To clarify, I currently stop the device in the following way:

  <pre>

  mwService.unregisterReceiver(MetaWearBleService.getMetaWearBroadcastReceiver());

  Accelerometer accelCtrllr =(Accelerometer) mwCtrllr.getModuleController(Module.ACCELEROMETER);

  accelCtrllr.stopComponents();

  mwCtrllr.close(true); // true if it calls MetaWearController.DeviceCallbacks.disconnected()

  c.unbindService(this);</pre>
• Eric

  August 2015

  DIsconnecting immediately after writing a command could result in the command being dropped.  It's possible the stop command was never sent due to closing the connection too quickly.
• bestname

  August 2015

  Thanks Eric, I have added a 1s delay.