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The Projects Forum Working on an electronics project and would like some suggestions, help or critiques? If you would like to comment or assist others with their projects, this is the place to do it.

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Old 05-14-2006, 11:30 PM
rose ann arandia rose ann arandia is offline
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Old 05-14-2006, 11:40 PM
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Quote:
Originally posted by rose ann arandia@May 14 2006, 06:30 PM
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Can you supply additional details describing how you would like this model elevator operates?

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Old 05-14-2006, 11:52 PM
rose ann arandia rose ann arandia is offline
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Quote:
Originally posted by hgmjr@May 14 2006, 04:40 PM
Can you supply additional details describing how you would like this model elevator operates?

hgmjr
it is a two storey elevator system.....runs by a motor,limitting switches and a simple circuit diagram......this is only my plan and honestly i dont know where to start this project.....so pls help me....thank in advance....
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Old 05-15-2006, 12:18 AM
rose ann arandia rose ann arandia is offline
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it is a two storey elevator system.....runs by a motor,limitting switches and a simple circuit diagram......this is only my plan and honestly i dont know where to start this project.....so pls help me....thank in advance....
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Old 05-15-2006, 01:33 AM
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Okay, just look at a full scale elevator...

You'll want limit switch for the upper floor lower floor to stop the motor. Additional switches for "close to limit" would be handy to slow the motor down. You'll want limit swithces for door open and door closed. You'll want a safety bumper switch on the door, and also an optical system to check for obstruction. You'll want a call button on each floor. You'll want a floor selection button for both floors. (Why they do that on a two story elevator, I'll never know. Tradtion, I guess.) You'll want buttons to hold the door open and to close the door. You'll want an alarm button and a telephone or intercom. If you want full authenticity, you'll want a key switch for lockout and over-ride.

You'll want logic that determines whether the motor moves, and in which direction. For full authenticity, you can add a fire alarm recall feature. You'll want logic for opening and closing the door.



...unelss, of course, it's just an old-fasioned freight elevator. Then you just need limit switches for each floor and direction control switch. I've been in one elevator where everything was done with one switch, a steel cable, and some clever mechanical bits. We pulled up on the steel cable to go down, down to go up, and the mechanical bits pulle the cable the other way when we got to where we wanted to be and threw a lever.
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Old 05-15-2006, 04:30 AM
rose ann arandia rose ann arandia is offline
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Quote:
Originally posted by thingmaker3@May 14 2006, 06:33 PM
Okay, just look at a full scale elevator...

You'll want limit switch for the upper floor lower floor to stop the motor. Additional switches for "close to limit" would be handy to slow the motor down. You'll want limit swithces for door open and door closed. You'll want a safety bumper switch on the door, and also an optical system to check for obstruction. You'll want a call button on each floor. You'll want a floor selection button for both floors. (Why they do that on a two story elevator, I'll never know. Tradtion, I guess.) You'll want buttons to hold the door open and to close the door. You'll want an alarm button and a telephone or intercom. If you want full authenticity, you'll want a key switch for lockout and over-ride.

You'll want logic that determines whether the motor moves, and in which direction. For full authenticity, you can add a fire alarm recall feature. You'll want logic for opening and closing the door.
...unelss, of course, it's just an old-fasioned freight elevator. Then you just need limit switches for each floor and direction control switch. I've been in one elevator where everything was done with one switch, a steel cable, and some clever mechanical bits. We pulled up on the steel cable to go down, down to go up, and the mechanical bits pulle the cable the other way when we got to where we wanted to be and threw a lever.
Exactly.....can you give me all the name of materials needed in this project....pls....thanks a lot......
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Old 12-06-2007, 08:53 AM
ikram badawi ikram badawi is offline
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hi all
my project is to build an elevator and control it using DC motors, a do not start in my project particullary, but i can tell you that yon need motors, sensors (infrared sensors or other on the door, and position sensors to stop the car on the level of the floor).
i will ask you if you need to control its speed smothly or not, and use stepper mptors or seperately excixited motors>>>>>>thanks
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Old 12-06-2007, 04:17 PM
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If you want to use relays, you can use the solution I've proposed in the other topic. Just take out the middle floor limit switch and presto. See the image below:
Attachment 1611
You can therefore rename the the UP and DOWN buttons to 1 and 0, respectively. The UP button will be the call button on floor 1 and the DOWN button will be the call button on floor 0. You can use this buttons inside the elevator car as well. You can even use two call buttons and two car buttons: just add more buttons in parallel with the existing ones.

I think I gave you enough info.

Note: If you can find two quad pole, double trow relays, use them. The alternative is to use four DPDT relays.
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Last edited by cumesoftware; 12-06-2007 at 04:27 PM.
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Old 12-06-2007, 10:39 PM
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While a stepper motor might work for a toy or model, it is not an accurate representation of what is used in a real elevator. If the purpose of the project is to model a real elevator, then either solenoid controlled gearing or PWM should be used for speed control.
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Old 12-06-2007, 10:49 PM
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how big is your elevator, how much weight do it need to carry?
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