{"id":18,"date":"2014-03-04T00:14:41","date_gmt":"2014-03-03T22:14:41","guid":{"rendered":"http:\/\/gronlier.fr\/blog\/?p=18"},"modified":"2014-11-23T16:31:15","modified_gmt":"2014-11-23T14:31:15","slug":"blync","status":"publish","type":"post","link":"https:\/\/gronlier.fr\/blog\/2014\/03\/blync\/","title":{"rendered":"Blync"},"content":{"rendered":"

There is funny little usb gadget called the Blync <\/a>identified by VID: 0x1130, PID: 0x0001.<\/p>\n

\"WP_20140303_006\"<\/a><\/p>\n

It's a glowing RGB cube, but it has two defects for me:<\/p>\n

    \n
  1. the driver is only available for Windows<\/li>\n
  2. only 7 colors are available<\/li>\n<\/ol>\n

    Let's fix it.<\/p>\n

    <\/p>\n

    Software hack<\/h4>\n

    That's the easy part.<\/p>\n

      \n
    1. Plug your Blync under Windows running in a virtual machine.<\/li>\n
    2. Start Wireshark under the Linux host<\/li>\n
    3. Dump USB packets<\/li>\n
    4. Think<\/li>\n
    5. Replay packets in Python<\/li>\n<\/ol>\n

      And Voil\u00e0: https:\/\/github.com\/ticapix\/blynux<\/a><\/p>\n

      Hardware hack<\/h4>\n

      That is already funnier.<\/p>\n

      First, unscrew and remove the white top.<\/p>\n

      \"WP_20140303_005\"<\/a><\/p>\n

      You will notice 5 RGB LEDs.<\/p>\n

      The LEDs look like this one PLCC6 SMD, LED SMP6-RGB<\/a>. The Polarity ID or Cathode mark is in the bottom left corner, so lower pins are the ground. They even put labels to ease the identification \ud83d\ude42 LR, LG, LB for, respectively, the Red, Green, Blue pins.<\/p>\n

      Take a Leonardo Pro Micro (! check that the boot loader is already installed !)<\/p>\n

      \"ebay01\"<\/a><\/p>\n

      The Leonardo Pro Micro is a 5V board, but the LEDs need 2.1V for the Red and 3.3V for the Green and Blue so we need to add 3 resistors of value \"\"<\/span>