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its very simple man ......
resistor is to draw the current 4m the voltage source when 3 is detecting any device thus grounding the arrow..
it is because if u connect any voltage souce directly to ground then there will be short ckt !!!!!!!!
Re: grounding my project
hey jus see the waay how the the circuits in cars r connected..
the ground is connectd to their metal cases u also try the same
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