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  32. <h2>Bluetooth UART (BTM-222)</h2>
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  40. <a class="FlattrButton" href="http://www.xythobuz.de/bluetooth.de.html" title="Bluetooth UART (BTM-222)">PCB for the BTM-222 and 5V level converters</a>
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  49. <h1>Bluetooth UART (BTM-222)</h1>
  50. <p>Hier das Layout einer Adapterplatine für den BTM-222 Bluetooth IC im <a href="http://www.rn-wissen.de/index.php/RN-Definitionen">Roboternetz Mini Format</a>. Die Schaltung stammt von <a href="http://www.robotfreak.de/blog/mikrocontroller/preiswerte-bluetooth-anbindung/44">Robotfreak</a>, entspricht aber im Prinzip der Minimalbeschaltung aus dem <a href="/files/btm222.pdf">Datenblatt</a>.</p>
  51. <p><a href="/img/BT_Top.jpg"><img alt="Platine oben" src="/img/BT_Top_small.jpg" /></a>
  52. <a href="/img/BT_Bot.jpg"><img alt="Platine unten" src="/img/BT_Bot_small.jpg" /></a>
  53. <a href="/img/bt_plan.png"><img alt="Schaltplan" src="/img/bt_plan_small.png" /></a>
  54. <a href="/img/BT_Layout.png"><img alt="Layout" src="/img/BT_Layout_small.png" /></a></p>
  55. <p><a href="/files/bluetooth.zip">Layout und Schaltplan als Eagle Dateien</a>.</p>
  56. <table border="1">
  57. <tr><th>ID</th><th>Wert</th><th>Shop</th></tr>
  58. <tr><td>R1</td><td>200k Ohm</td><td>-</td></tr>
  59. <tr><td>R2</td><td>5k Ohm Poti</td><td><a href="http://www.conrad.de/ce/de/product/430722/">Conrad</a></td></tr>
  60. <tr><td>R3 - R10</td><td>1k Ohm</td><td>-</td></tr>
  61. <tr><td>Q1 - Q4</td><td>BC547 NPN</td><td><a href="http://www.conrad.de/ce/de/product/155012/">Conrad</a></td></tr>
  62. <tr><td>IC1</td><td>LM317(LZ)</td><td><a href="http://www.conrad.de/ce/de/product/155585/">Conrad</a></td></tr>
  63. <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>
  64. <tr><td>LED 1+2</td><td>LED 5mm</td><td>-</td></tr>
  65. </table>
  66. <p>Das löten der Standard-Bauteile sollte kein Problem darstellen. Beim BTM-222 empfiehlt es sich, mit einem feinen Lötkolben jeden Pin einzeln anzulöten. Als Antenne kann ein 3,1cm langer Draht verwendet werden.</p>
  67. <h2>Ansteuerung des BTM-222</h2>
  68. <p>Vor der ersten Verwendung muss das BTM-222 Modul konfiguriert werden. Dort werden Geschwindigkeit, Format, Name, PIN und weitere Einstellungen getroffen. Dabei muss das Modul per Hardware-Schnittstelle an einen Computer angeschlossen werden. Nun können die im Datenblatt dokumentierten AT Befehle eingegeben werden. Sehr wichtig hierbei ist, dass das Modul als Zeilenendzeichen nur '\r' erwartet. Wird '\n' oder "\r\n" verwendet quittiert das Modul jegliche Eingabe mit Error.</p>
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