My ball clock at home

Technical data for the clock
Principle  The same as the clock at Vitensenteret. 
Electronic timebase. 
Time counted by number of balls in 4 trays. 
The ping pong balls are lifted by an air fan.
Building material Mainly plywood. Balls are lifted in a plexiglass tube. 
The complete clock is mounted on a wall.
Number of trays 4 trays. A new ball arrives every 2 minutes. 
Two trays count 2-minutes, 5 x 6 = 30. 
Two trays count hours, 6 x 4 = 24.
Fan arrangement Low noise 12V fan with just enough power to lift a ball. 
Electromagnet controlled entry mechanism for balls.
Electronics Crystal oscillator timebase. 
Microprocessor controlled functionality. Microchip PIC16F84 microcontroller. 
Everything, including fan powered through ordinary 12V AC/DC converter.
Project schedule Start january 1998. 
Finished may 1998.
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Last modified 5. nov 98