2015-01-29 (Th) Color/Touch + Sound

The list of components was scrutinized and pared down by eliminating the components which were not necessary since the sound chips can operate at 5.0VDC. The 5.0 volt regulator chosen was replaced for a different model with a higher current and a different footprint. When the device was inserted into the schematic it was done improperly so the screenshots show an improperly wired voltage regulator. The line going directly to the Vcc pin of the Arduino should be removed or routed to RAW.

 Voltage regulator. Improperly wired

A header pin array (1x6) was added to allow different sound modules to be used in lieu of the onboard sound chips. The five signal wires and a ground were wired to the six pin header array. This should be changed to at least seven contacts so Vcc (5.0VDC) can also be provided. Even numbers are more common in headers so an eight position header will likely be used. The additional pin can be RAW power in case a supplementary sound module uses the incoming voltage.

Header pin. Probably too small

A two-position header array was added to act as a switch for activating the, as of yet unprogrammed, alternative modes. Since this is being put on an analog input there should be a three-position to allow selection between ground or Vcc instead of adding a pull-up resistor.

 Auxiliary mode selector. Missing Vcc pin

Whole schematic. Lots of things wrong

To do:
  1. Buy Switches with rollers
  2. Install Switches
  3. Create circuit board
    1. Designate all components
    2. Design schematic of components
      1. voltage regulators
      2. Rename "Volume Control" to "Potentiometer"
      3. line level converters
      4. opto-Isolators
      5. power terminals
      6. mother-daughter board connectors
      7. device inter-connection signals
      8. auxiliary posts for musical devices
      9. jumper for alt modes
      10. and supporting components.
    3. Design layout for single layer board
  4. Make a parts list with links
  5. Order parts list
  6. Print circuit board
  7. Install components 
  8. Test + Verify
  9. Make all documentation public

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2015-01-27 (Tu)