Exhibit "De Hoep"

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Display windows, lighted with high-power LEDs
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"Slot machine"
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Talking dunes
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Salt water level
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Salt water level, the construction (behind the panel)
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Water dispenser
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Animated light (6-channel chaser)
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Industrial trackball
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Entry of the exhibit centre "De Hoep"

Description	Exhibit centre of PWN in Castricum, Holland with diverse "objects" (a.o. "slot machine", "water dispenser", "speaking doorbells", light show, etc.)
Company	PWB / PWN
Time	1 month
Development notes	Design, development and installation of control electronics (custom apparatus), embedded software, switches, handles, level sensors, MP3-audio, ticket printer, light shows, etc.
More information	In several objects we have used a programmable MP3 player of our own design. This MP3 player supports standard "Compact Flash" cards, to make exchanging the audio fragments a simple task. Additionally, switches, sensors and actuators (or external electronics) can be connected to the MP3 player directly; a control program embedded in the MP3 player drives the complete apparatus. For example, the "Salt water level" demonstration is activated by two micro switches mounted at the construction. The "Talking dunes" use standard switches, but the MP3 player also controls the (tungsten halogen) lighting in the object. The "Water dispenser" contains a ticket printer and a 2-line LCD for displaying the response to the users choices.