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vending machine-modeling a weighing machine-ladder diagram

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crimson tide

Joined Mar 30, 2009
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a vending machine recognizes (by making a relay pick up) a coin of denomination 2.when the coin has appropiate dimensions (diameter,thickness) is metallic in composition and of adequate weight..dimensions are detected by photo-cells,when min. n max. values of dimensions are satisfied and appropiate relay pick up occurs.when dimensions are less than minimum and more than max the composition is detected by the eddy current drawn by the coil excited at 30 khz..a spring loaded with pan detects the weight.the weight should be less than the load disc of same dimensions.draw a ladder diagramto implement the function .. need it by 5 april...
 
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