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Door controller

Discussion in 'General Electronics Discussion' started by deepakmcu, Jul 6, 2010.

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  1. deepakmcu

    deepakmcu

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    Jul 6, 2010
    I had developed a 2 door controller with Atmel 89s52 ,feedback sensor ,ULN 2003 and 12v/7A relay ouput .

    this system works like by default both doors are in closed position (both relays ON),as when switch is pressed 1 door is open (relay1is off) depending upon which switch is pressed as SW1 corrsponds to Door1 and Sw2 corrsponds to door2.

    this circuit is working fine with in 10 meter range but when the distance between 2 doors wiil be more than 50 meters this circuits stops controlling the door locks (400mA current).

    but when i shorten the ground loop circuits works fine,can anyone suggest me how to increase ground signal strength upto several meters.
     
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