Here is another example – a novelty money box in the shape of a frog. (The frog contains the electronics which is intended to sit on top of a larger container for holding the money). Coins put into the frog mouth are sensed by an infra-red reflective switch. In response, a PIC flashes bi-coloured LED eyes and plays a catching tune (Paul McCartneys ‘We all stand together’ – the frog chorus!)
Fig 27 Money box schematic (in block diagram form)
Fig 28 Details of the reflective-opto sensor block
Fig 29 Details of the tri-colour LED block
Fig 30 Details of the speaker block
Fig 31 Details of the PIC block which includes of the programming connector and power supply components
Fig 32 PCB designed to fit a frog shaped enclosure
Fig 33 PCB design exported to pro|ENGINEER as a 3D DXF file. (XLD also supports IDF3 file export)
Fig 34 ‘Sketch’ of PCB outline
The sketch of the PCB outline is created using the imported DXF . . .
Fig 35 pro|ENGINEER ‘Use’ button
. . . with the ‘Use’ button.
Fig 36 Frog enclosure assembly of three parts (lid, centre and base). The organic shape has been created using warping and variable section sweeps.
Fig 37 Frog assembly showing location of electronics
Fig 38 Frog vacuum forming moulds being cut using an MDX40 3-axis router (from pro|ENGINEER stl file)
Fig 38 Vacuum formed base shown alongside its mould. Notice its webbed legs!
Fig 40 PCB fitted into vacuum formed base
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