Author Topic: New Project  (Read 3549 times)

0 Members and 1 Guest are viewing this topic.

Offline RoBoTicSTopic starter

  • Full Member
  • ***
  • Posts: 80
  • Helpful? 0
  • Man is a robot with defects
New Project
« on: January 15, 2009, 07:24:29 AM »
Hey everybody I was thinking about somehow putting a sensor on my bedroom door and when I walked up to it it would open.  Does this seem possible or is it out of my league also how would I control it?

Thanks,
Zach

Offline airman00

  • Contest Winner
  • Supreme Robot
  • ****
  • Posts: 3,653
  • Helpful? 21
  • narobo.com
Re: New Project
« Reply #1 on: January 15, 2009, 08:05:01 AM »
Simple to do

Get a sonar sensor and get the range of an object approaching your door , once the range is close enough then open the door.
By opening the door , do you mean unlocking it? or swinging open the door so you can walk in?
Check out the Roboduino, Arduino-compatible board!


Link: http://curiousinventor.com/kits/roboduino

www.Narobo.com

Offline RoBoTicSTopic starter

  • Full Member
  • ***
  • Posts: 80
  • Helpful? 0
  • Man is a robot with defects
Re: New Project
« Reply #2 on: January 15, 2009, 09:26:30 AM »
I wont have no lock or anything like that on it.  It will swing open.  Then once I make it though the door I want it to close shut.

I am guessing I will need a micrcontroller then hook the sonar sensor up to it and program it.

What will the door be moved with?

Offline airman00

  • Contest Winner
  • Supreme Robot
  • ****
  • Posts: 3,653
  • Helpful? 21
  • narobo.com
Re: New Project
« Reply #3 on: January 15, 2009, 09:33:23 AM »
What will the door be moved with?

Thats the problem. I would go with some pulley system thats turned by a beefy motor ( controlled through relays by microcontroller)
Basically have a motor wind a rope which is connected to the door and it  pulls open the door. Then the motor unwinds the rope and the door closes ( this assumes that the door closes by itself because of gravity OR there is a spring there that pushes the door shut and the motor pushes overcomes the spring force to shut it when opening the door.)
Check out the Roboduino, Arduino-compatible board!


Link: http://curiousinventor.com/kits/roboduino

www.Narobo.com

Offline RoBoTicSTopic starter

  • Full Member
  • ***
  • Posts: 80
  • Helpful? 0
  • Man is a robot with defects
Re: New Project
« Reply #4 on: January 15, 2009, 09:50:33 AM »
Okay this is what I am going to do.

First I am going to hook a spring at the top of the door to the outside door frame.  So when I have the pulley on the other on the wall and connected to the door with a string. It will be activated with a sonar senser then it will  stretch the spring, once it is open I will walk through then the pulley will retract and let the string out and the spring will go back to its normal stage closing the door at the same time.

The hardest part for me will be programming it.

Also I will probably use a strong servo instead of a motor

Offline airman00

  • Contest Winner
  • Supreme Robot
  • ****
  • Posts: 3,653
  • Helpful? 21
  • narobo.com
Re: New Project
« Reply #5 on: January 15, 2009, 10:20:02 AM »
Also I will probably use a strong servo instead of a motor
I doubt a servo will have enough torque.

This is what you will have to do :
Calculate the spring force of the spring : Force of Spring = kx , where k is the springs constant and x is the spring's extension
Then you need to calculate how much force is needed with the pulley - you'll have to look at pulley equations
Then you'll have to translate how much force the pulleys need into torque of a motor.
Check out the Roboduino, Arduino-compatible board!


Link: http://curiousinventor.com/kits/roboduino

www.Narobo.com

Offline RoBoTicSTopic starter

  • Full Member
  • ***
  • Posts: 80
  • Helpful? 0
  • Man is a robot with defects
Re: New Project
« Reply #6 on: January 15, 2009, 06:53:04 PM »
Okay
I will just have to find a pulley and a spring somewhere around the house or I will go to the hardware store.
I will post up again if anything goes wrong ;)

Offline izaktj

  • Robot Overlord
  • ****
  • Posts: 216
  • Helpful? 0
Re: New Project
« Reply #7 on: January 15, 2009, 07:02:36 PM »
Good luck mate  ;D

Offline want2learn

  • Robot Overlord
  • ****
  • Posts: 189
  • Helpful? 4
Re: New Project
« Reply #8 on: January 16, 2009, 01:10:44 PM »
Have you seen those soft close door things that mount to the top of a door and have a jointed arm assembly?

They do a motorised version. When I was at school (when dinosaurs roamed the earth :D) a few of the doors had them, they were for disabled access.
I think you could find one of them easily in a salvage yard and convert it for your needs.

If you can't find a motorised one a geared down hobby grade R/C drive motor would suffice for the drive. You may need to use an H-Bridge with limit switches to prevent over-travel
The question that drives me hazy:

Am I, or the others crazy?

Offline RoBoTicSTopic starter

  • Full Member
  • ***
  • Posts: 80
  • Helpful? 0
  • Man is a robot with defects
Re: New Project
« Reply #9 on: January 16, 2009, 07:38:47 PM »
Quote
Good luck mate 

thanks

Quote
Have you seen those soft close door things that mount to the top of a door and have a jointed arm assembly?

Thats a good idea I will check that out

Offline Metal Slug 2

  • Supreme Robot
  • *****
  • Posts: 333
  • Helpful? 11
Re: New Project
« Reply #10 on: February 08, 2009, 03:32:23 PM »
Hey :)  Ive always been interested in an idea like this.  when i was 10 i built something like it...except everything was controlled from my bed, by strings (yes i did have to screw in 0-ring screws into my walls and ceilings, and yes my mom freaked out..but i still got to keep it  ;D).  i had everything controlled by strings.  Even a bunch of boobie traps! (one would drop a bunch of jacks on your head, another roll bunch of marbles at your feet..etc.)  I would simply pull the corresponding sting to make a boobie trap or other device work.   But now, with the extremely useful help of this website, i think i can automate everything!

Thats the problem. I would go with some pulley system thats turned by a beefy motor ( controlled through relays by microcontroller)

Ive always wondered about that, i could never picture how you would hook up a high power consuming motor to a small MCU.  apparently through 'relays' ...could someone please enlighten be on what they are and how to go about making or doing a relay type thing for lets say the $50 robot.  or possible a couple resources? :)

Thanks :)

Offline frodo

  • Supreme Robot
  • *****
  • Posts: 329
  • Helpful? 2
  • BOW DOWN TO MY MIGHTY STARE!!
Re: New Project
« Reply #11 on: February 08, 2009, 03:51:56 PM »
wow, metalslug, you sound creative. making a whole pulley system at 10. thats really cool.
OMG!!!! I AM SUPREME ROBOT!!!

Check out my Web

Offline Razor Concepts

  • Supreme Robot
  • *****
  • Posts: 1,856
  • Helpful? 53
Re: New Project
« Reply #12 on: February 08, 2009, 05:49:50 PM »
Metal Slug what state do you live in? I heard of a story of a guy who got accepted into my school because he built a pully system to open a door.

Offline frodo

  • Supreme Robot
  • *****
  • Posts: 329
  • Helpful? 2
  • BOW DOWN TO MY MIGHTY STARE!!
Re: New Project
« Reply #13 on: February 08, 2009, 05:53:08 PM »
someone got accepted into a school for building a pulley system? what school is this?
OMG!!!! I AM SUPREME ROBOT!!!

Check out my Web

Offline Razor Concepts

  • Supreme Robot
  • *****
  • Posts: 1,856
  • Helpful? 53
Re: New Project
« Reply #14 on: February 08, 2009, 05:54:45 PM »
TJHSST - a magnet high school, you have to apply to get in.

Offline frodo

  • Supreme Robot
  • *****
  • Posts: 329
  • Helpful? 2
  • BOW DOWN TO MY MIGHTY STARE!!
Re: New Project
« Reply #15 on: February 08, 2009, 05:55:47 PM »
magnet high school?
OMG!!!! I AM SUPREME ROBOT!!!

Check out my Web

Offline Metal Slug 2

  • Supreme Robot
  • *****
  • Posts: 333
  • Helpful? 11
Re: New Project
« Reply #16 on: February 08, 2009, 07:54:35 PM »
Metal Slug what state do you live in? I heard of a story of a guy who got accepted into my school because he built a pully system to open a door.
I don't live in the states, I'm your neighbor to the north ;) I live in Ontario, Canada.
I'm also in Gr. 11 now, so University will be the next step.

wow, metalslug, you sound creative. making a whole pulley system at 10. thats really cool.
Thanks.  All my contraptions came in quite useful (although they were completely unpractical because you could only operate them from my bed).  For example if my younger brothers would walk into my room and i would be for some reason lying on my bed, and i didn't want them in their, i would make them leave by the simple pull of a string which would set off an elastic band shooter or swing a large rubber ball into their face.  It was very simple stuff though.  Ive since build bigger and better contraptions and things...



« Last Edit: February 15, 2009, 11:44:21 AM by Metal Slug 2 »

Offline cooldog

  • Supreme Robot
  • *****
  • Posts: 751
  • Helpful? 4
  • be nice to nerds, one day they will be your boss
Re: New Project
« Reply #17 on: February 08, 2009, 07:57:41 PM »
robot will rule the world and i will be building them
-admin

favorite web sites
http://www.societyofrobots.com/
http://www.instructables.com/

Offline Admin

  • Administrator
  • Supreme Robot
  • *****
  • Posts: 11,657
  • Helpful? 169
    • Society of Robots
Re: New Project
« Reply #18 on: February 15, 2009, 06:58:56 AM »
Quote
Ive always wondered about that, i could never picture how you would hook up a high power consuming motor to a small MCU.  apparently through 'relays' ...could someone please enlighten be on what they are and how to go about making or doing a relay type thing for lets say the $50 robot.  or possible a couple resources?
Don't use a relay, use a MOSFET. A simply I/O pin on a microcontroller acts as the on/off switch, while the MOSFET handles the huge amounts of power.

 


Get Your Ad Here