Monday, March 7, 2016

Bluegiga WT12 Controls all Pebbles

Did some searching and found a bluetooth chip that does SSP Master, which is used by all the pebbles.  My existing code still works, just the initial configuration of the board (which you can do through serial) is different.

SET BT PAIR *
SET BT AUTH * 0000
SET BT SSP 3 0
SET BT POWER 0 0 0
CALL b0:b4:48:9d:cc:08 1101 RFCOMM
SET CONTROL AUTOCALL 1101 5000 RFCOMM

This configures the board to connect and automatically reconnect to a watch.  Power=0, gets translated to -2, which is still enough power to cover my house.  Once paired with the watch and the Wixel in sleep, it's around 5ma.  With the Wixel actively listening it's approx 27ma.  When the Bluetooth module receives data it's 35ma.  Generally you're running at 5ma, the higher numbers are for a few seconds every 5 minutes.  The pebble appears to be "chatty", so you see frequent 35ma bursts, this may be an issue, but I think I can get 20 hours out of a 110 mAh battery.

I'll probably make this over the weekend:

That's the WT12 "dead bugged" on top of the Wixel.  Curious to see if I can get away with that.

Allot of useful information here: http://www.keyglove.net/2011/03/24/bluegiga-wt12-bluetooth-module-connection/ , this guy also sells a development board for the WT12 which makes it breadboard friendly.
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2 comments:

  1. InfernexJune 6, 2016 at 4:31 AM

    Hi Don,
    I have been thinking of creating a project fairly similar to this one and another of your posts. I wanted to connect an Arduino or some variant to a Bluetooth module and get a Pebble TIME to ultimately control the Arduino via a Pebble app I will program (a variant of the pre-installed music app on the Pebble). I was wondering how exactly I would be able to do this. My idea is to create a RC car controlled via the Pebble DIRECTLY. What Bluetooth module would you recommend, how would I pair them and how would I, then, allow the Pebble to control the Arduino?
    Thanks in advance and I appreciate ANY help and guidance.
    Cheers,

    Infernex

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  2. DonJune 10, 2016 at 1:50 PM

    This post pretty much covers it. You need a WT12, and a micro capable of doing more than one instance of Hardware serial, Mega, teensy or Wixel come to mind. Another post covers the packet formats. You'll need to use a serial pass-thru app to view communications between the pebble and arduino. When the pebble sends a message, you should see it in your terminal app, and you'll have to figure out how to decode it. I've only done arduino to pebble, not the reverse.

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