<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="/sodnpoo.xsl"?>
<xml>
<post>
  <title>homemade btm182 breakout</title>
  <date>
  25 Apr 2011
  </date>
  <p>
  This is my homemade btm182 bluetooth module breakout board. Although the module is a SMD part - due to the pads being 'c' shaped and their pitch being the same as the ribbon cable I was using (see <a href="http://dlnmh9ip6v2uc.cloudfront.net/images/products/09913-01.jpg">here</a>) - I was able to break it out to a small piece of stripboard.
  </p>
  <image src="/posts.assets/btm182_stripboard_breakout.jpg"/>
  <p>
  Although I took the time to breakout all of the module's pins to the stripboard, in the end I only ended up putting headers on seven of them and even then only four (rx, tx, +3.3v, GND) of them are used. The three LEDs are power, data and link. Many thanks to Atomsoft who kindly published the <a href="http://atomsoft.wordpress.com/2011/02/03/bt-up-and-running/">relevant pin outs</a>.
  </p>
  <p>
  As the btm182 is a 3.3v device I used a level shifter to interface it with my 5v arduino. I built this into a 'shield' for my <a href="http://sodnpoo.com/posts.xml/stripboard_arduino_clone.xml">stripboard arduino clone</a>.
  </p>
  <image src="/posts.assets/btm182_stripboard_level_shifter.jpg"/>
  <p>
  And finally - an Eagle board diagram of the shield - this if my first go at one but hopefully it's readable. The horizontal yellow lines are the copper stripboard tracks (only the used tracks are shown) and the red lines are top side jumper wires, the dashed ones are the four connections to the ribbon cable.
  </p>
  <image src="/posts.assets/btm182_stripboard_level_shifter_diagram.jpg"/>
  <p>
  </p>
</post>
</xml>


