====== Digital bubble tube ======
//A bubble tube with LCD.//

===== Changelog =====
**Status: ** //Done.//

^ Date ^ Comment ^
| 2005-08-30 | Project created. |

===== About =====
A digital bubble tube implemented in a CPLD. Showing the angle in degrees on a LCD-display. 

===== Hardware =====
The base of the project is a xlinx CPLD. An LCD-display attached to this shows the current relative angle against a xy-plane. An accelerometer output a pulse width moduleated pulse relative to the G-forces in the two earth directions which the CPLD messaures and convert to angles using a lookup table in memory. The angles for x and y are displayed on the LCD.
This project was a part of the digital contruction course at Chalmers and has been developed by Johan Böhlin, Michael Bodin, Patrik Opacic and Peiman Khorramshahi. 

===== Schematics =====
{{:hardware:dk_block.jpg?320 |Block layout.}} Block layout.

===== Firmware =====
Hardware written in VHDL and generated by state CAD. 

===== Downloads =====
Request for sourcecode.
The report can be downloaded {{:hardware:dk_report.pdf| here}}. 

===== License =====
All information found on this page are licensed. See the [[documents:license]] page for more information.