Subject:
|
RE: super cheap tilt sensor?
|
Newsgroups:
|
lugnet.robotics
|
Date:
|
Wed, 22 May 2002 16:06:30 GMT
|
Original-From:
|
Rob Limbaugh <rlimbaugh@+StopSpammers+greenfieldgroup.com>
|
Viewed:
|
671 times
|
| |
|
|
For some reason, I didn't consider "centered" as a valid position... error on my
part (big time).
However, if the weight were spinning constantly, perhaps "center" and "tilt"
could be determined...
If the speed is constant over a full revolution, then the base must be centered
(or close to it). Where the change in speed of the rotation occurs is where
high/low points could be calculated.
-----Original Message-----
From: Luke Wenke [mailto:lwenke@hotmail.com]
Sent: Wednesday, May 22, 2002 11:25 AM
To: lego-robotics@crynwr.com
Subject: Re: super cheap tilt sensor?
I had to copy and paste that into notepad to get it to display properly.
I see what you mean now... though it is only useful when there is a tilt -
it wouldn't be able to detect if something is centered.
"Rob Limbaugh" <lego-robotics@crynwr.com> wrote in message
news:73718FFFA963C045BD5B74B2F9B1EBA5170087@gcgpo1.greenfieldgroup.com...
What I attempted to describe was a single-sensor solution. Hopefully this
ASCII drawings below will help clarify my thoughts...
Viewed from above
-----------------
____
_ | |]
| | | |]
Wheel or --> | |=======O |] <--- rotation
weight |_| |____|] sensor
Viewed from side
----------------
_
| | _
Wheel or --> | |=======| |
Weight |_| _|_|_
| |] <-- rotation
|_____|] sensor
Consider a circle with the 16 positions determined:
0
.....
... ...
.. ..
. .
. .
12 . o . 4
. .
. .
.. ..
... ...
.....
8
Depending how that circle is tilted, gravity will pull the wheel like a
compass needle giving you two axis off one sensor.
-----Original Message-----
From: Luke Wenke [mailto:iljwamh1234567890@hotmail.com]
Sent: Tuesday, May 21, 2002 11:26 PM
To: Rob Limbaugh
Subject: Re: super cheap tilt sensor?
That sounds like a pendulum then... and I'll need to buy a rotation sensor
or two (for two axes)
thanks,
Luke.
----- Original Message -----
From: "Rob Limbaugh" <RLimbaugh@greenfieldgroup.com>
To: "Luke Wenke" <lwenke@hotmail.com>; <lego-robotics@crynwr.com>
Sent: Tuesday, May 21, 2002 10:51 PM
Subject: RE: super cheap tilt sensor?
How about using an free-moving arm in a plane parallel to the "floor"?
(i.e. - like an analog wall clock placed face-up on a table)
If the arm had a some weight and a wheel on one end and a shaft for a
fulcrum on the other end, the position of the arm would always be (or move
to) the lowest point. Either place the fulcrum shaft directly through a
Lego rotation sensor or use a little gearing to increase precision.
-----Original Message-----
From: Luke Wenke [mailto:lwenke@hotmail.com]
Sent: Tuesday, May 21, 2002 8:05 AM
To: lego-robotics@crynwr.com
Subject: super cheap tilt sensor?
I was wondering if anyone knew of any extremely cheap and easy way of making
a tilt sensor - that preferably doesn't involve transistors, etc.
The best I can come up with are some mercury tilt switches with some
resistors - so that a single input port can sense the states of 4 or 5
mercury switches. This would be good for detecting if something is tilting
forward, backward, left or right - but I'd prefer if it was more analog
(like a light sensor). Maybe there could be a pendulum hooked up to some
kind of extremely loose variable resistor or "pot". But I don't know where
to buy those.
|
|
1 Message in This Thread:
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
