Hydra Board - Size & Robot?

Comments

• Mike Green Posts: 23,101

  2009-03-14 16:06 edited 2009-03-14 16:06

  I measure 5 inches square. I've not heard of it used for a robot, probably because (like the Demo Board) there's limited I/O pin availability and those are really tied up in the expansion connector.
• Humanoido Posts: 5,770

  2009-03-14 23:24 edited 2009-03-14 23:24

  Thanks Mike. How many pins are tied up in the expansion connector, i.e. how many are free and available for use? In the PROP Demo board, there are 8 I/O pins available for use.
  
  www.parallax.com/Store/Microcontrollers/PropellerDevelopmentBoards/tabid/514/CategoryID/73/List/0/Level/a/ProductID/340/Default.aspx?SortField=ProductName%2cProductName
• Mike Green Posts: 23,101

  2009-03-15 04:25 edited 2009-03-15 04:25

  Parallax used to have a sample chapter from the Hydra book that included a description of the Expansion port. In any event, pins 16-23 are the 8-bit bus and are shared with the VGA output. There's a buffer that manually disconnects the Expansion port from the VGA interface. Pins 1 and 2 are used for the HydraNet interface and are present on the Expansion port connector. Pins 28 and 29 (for the EEPROM) are also present on the connector. Everything else is accounted for.
• Humanoido Posts: 5,770

  2009-03-16 03:59 edited 2009-03-16 03:59

  Thanks Mike!
  humanoido