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  33. <h2>Bluetooth UART (BTM-222)</h2>
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  35. <div id="lang"><span id="lang2">Translation:
  36. <a href='bluetooth.de.html'>de</a> | <a href='bluetooth.html'>en</a>
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  40. <h1>Bluetooth UART (BTM-222)</h1>
  41. <p>Here's the Layout of a BTM-222 Bluetooth PCB, following the <a href="http://www.rn-wissen.de/index.php/RN-Definitionen">Roboternetz Guidelines Mini Format</a>. The circuit comes from <a href="http://www.robotfreak.de/blog/mikrocontroller/preiswerte-bluetooth-anbindung/44">Robotfreak</a>, but is basically the minimal circuit described in the <a href="/files/btm222.pdf">datasheet (370kB)</a>.</p>
  42. <p><a href="/img/BT_Top.jpg"><img alt="PCB Top" src="/img/BT_Top_small.jpg" /></a>
  43. <a href="/img/BT_Bot.jpg"><img alt="PCB Bottom" src="/img/BT_Bot_small.jpg" /></a>
  44. <a href="/img/bt_plan.png"><img alt="Circuit diagram" src="/img/bt_plan_small.png" /></a>
  45. <a href="/img/BT_Layout.png"><img alt="Layout" src="/img/BT_Layout_small.png" /></a></p>
  46. <p><a href="/files/bluetooth.zip">Layout and Circuit Diagram as Eagle files (54kB)</a>.</p>
  47. <table border="1">
  48. <tr><th>ID</th><th>Value</th><th>Shop</th></tr>
  49. <tr><td>R1</td><td>200k Ohm</td><td>-</td></tr>
  50. <tr><td>R2</td><td>5k Ohm Poti</td><td><a href="http://www.conrad.de/ce/de/product/430722/">Conrad</a></td></tr>
  51. <tr><td>R3 - R10</td><td>1k Ohm</td><td>-</td></tr>
  52. <tr><td>Q1 - Q4</td><td>BC547 NPN</td><td><a href="http://www.conrad.de/ce/de/product/155012/">Conrad</a></td></tr>
  53. <tr><td>IC1</td><td>LM317(LZ)</td><td><a href="http://www.conrad.de/ce/de/product/155585/">Conrad</a></td></tr>
  54. <tr><td>IC2</td><td>BTM 222</td><td><a href="http://shop.ulrichradig.de/aktive-Bauelemente/Module/Bluetooth-Module-BTM222.html">Ulrich Radig</a></td></tr>
  55. <tr><td>LED 1+2</td><td>LED 5mm</td><td>-</td></tr>
  56. </table>
  57. <p>Soldering the standard parts should be no problem. You should use a find soldering iron to connect each pin of the BTM-222, one after another. A 31mm long piece of wire can be used as antenna.</p>
  58. <h2>Interfacing the BTM-222</h2>
  59. <p>Before using the BTM-222 you have to configure it. You can change the speed, data format, name, PIN and some other things. You have to connect the hardware serial interface of the BTM-222 to a PC and issue the AT-Commands documented in the datasheet. It is very important to use only '\r' as Line-End-Character. Using '\n' or "\r\n" will result in error messages from the module.</p>
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