# Available mechanism to close and open a door

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#### nullexception

##### Junior Member level 2
I have a box which i want to open at the bottom.My box looks like this

My first choice was use of electromagnets but the power used would be too much.What other mechanisms i can use to close and open a the bottom part of my box?.

#### Genovator

You can use low rpm, high torque DC motors to open the door smoothly. Connect the motor to the hinge, and use push buttons to detect when they are fully closed or open, and stop the motor accordingly.

#### nullexception

##### Junior Member level 2
Thanks for the response. In the event that i have many boxes that would mean many motors and hinges. Is there another simpler solution that would work by applying a small current to say a joint and the joint opens and a different current is applied and the opening closes?.

#### KlausST

##### Super Moderator
Staff member
Hi,

nice description.

It´s almost as prcise as my description:
I have a resistor. it is huge. It has two legs.
It looks like this -----<====>------
And there are some colors on it. One color is the same as my car. There are many resistors on a tape.
Where should i connect this resistor to increase output power of my amplifier?

Got it?

Klaus

#### nullexception

:grin:

Tell us more...

Klaus

##### Super Moderator
Staff member
Add a counterweight. This will minimize the power needed. Then a solenoid may be sufficient to open and close the door.

#### logicon

##### Member level 1
Electromagnets may be your best choice. I think the overall energy consumption will be a lot less than using several motors. What you need to figure out is a mechanical latching mechanism for opening and closing. This you will have to design. Let me know if it helps.

nullexception

Points: 2