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The Talking Whiteboard

This the latest project (December 2016).

Its key aspects are:-

  • Touch sensitive (like a tablet)
  • Pictures easily changes
  • Sound files easily changes
  • No programming skill needed.

The Electric White Board

Clear eBoard
The eBoard has 12 "Hot Spots". They are made of "EMI" copper tape overlaid with with gaffer tape. Touching any one of these hot spots will trigger a sound. Touch it again whilst the sound is playing makes the sound stop
Components Description / Hardware Functional Areas
Bare Conductive

Bare Conductive: This is a multifunction board that combines.

  • Sound file playing (MP3 or MIDI)
  • Capacitive Sensors
  • On board processor (Leonardo eqv of an Arduino).
  • Can be power by LIPO battery or external regulated 5v supply.
Amplifier

Amplifier

Almost any amplifier can be used. This one has the advantage of small size, volume control and can run off 6-15v. It is worth checking that the voltage range fits in with the other components used (I have been caught out this way a couple of times).

This is a "Class D" stereo amplifier that will happily run on 9v.

5 volt regulator

Voltage Regulator.

As the eBoard is powered by a single 9v battery, an onboard 5v regulator was required to provide the 5 volts for the "Bare Conductive Board". This regulator can source up to 2.5 Amps so it is useful if a 5 volt amp is used.

Other components

  • 9 volt battery case.
  • On off switch (Take care not to se one with a built in light ~ they can cause excess current drain.
  • LED (to show the board is switched on.
  • 2k resistor for current limitation
  • Cheap 60cm x 40 cm white board

 

Reverse side of the eBoard showing the electronics.

NB Nylon nuts had to be used to attach the wires as steel ones tended to short out the adjacent contacts.

eBoard ~ rear

 

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