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'[PIC]:how to use acceleration sensor for motion co'
2002\07\09@115526 by personal

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need to control two dimension movement, speed and distance. or may be even rotation movement.

how good sensor is needed?  0.01 mg , from analog device, enough?

acceleration sensor should works, theorically. any example? site?

BR,

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2002\07\10@034553 by Pang

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Hi,

I have posted some questions on the area of acceleration sensor some months
ago and gain a lot of knowledge from other piclisters. For searching
purpose, the subject of the thread is [EE]:Tilt Sensor. A two axis
accelerometer are basically used to detect both dynamic acceleration
(vibration) and static acceleration (gravity). As such, a dual axis
acceleration can be use to detect vibration, tilting, and acceleration.

I have given up on searching for a tilt sensor solution because accelerators
are very expensive. ADXL202 is expensive and fragile. You can check also the
accelerators from Memsic, but they are also very expensive (USD14.50).

As for the rotational sensor, piclisters has suggested on using a optical
encoder or ball bearing potentionmeter or electrolytic tilt sensor. Have yet
to get some samples on that. Perhaps you can consider these for rotational
sensor.

There could be others which I do not know.

Rgds,
Pang



Subject: [PIC]:how to use acceleration sensor for motion control?


need to control two dimension movement, speed and distance. or may be even
rotation movement.

how good sensor is needed?  0.01 mg , from analog device, enough?

acceleration sensor should works, theorically. any example? site?

BR,

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2002\07\10@225848 by Jim

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Hello
I'm building a small robot and was planning to build a tilt sensor that
should measure acceleration to.
I only have the idea I haven't done any testing yet. The idea is to make a
small pendulum with a ferrite
bead as the weight. Near this will be a coil that is part of a tank circuit
of an oscillator as the ferrite bead
swings near or farther from the coil the frequency will change and I will
keep track of it with one of the timer
inputs on a PIC. The pendulum may need to be dampend. I once saw a small
scale that had it's beam
dampend by having a small copper plate attached to the beam swing near 2
small magnets this would
cause eddy currents in the copper and dampen the beam movment.

Regards
Jim


{Original Message removed}

2002\07\11@035607 by Mike Pink

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Hi Jim

If I can suggest an alternative.

Small tube with a magnetic ball bearing held loosely in the middle between
two soft springs. At one or both ends [resolution} is positioned a linear
hall effect IC. the output of which varies with distance from a magnet. This
will produce a single axis accelerometer, response will be a direct result
of spring force and damping can be provided by filling the tube with a light
oil, viscosity to suit.

Mike

----- Original Message -----
From: "Jim" <.....james3162KILLspamspam.....WORLDNET.ATT.NET>
To: <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>
Sent: Wednesday, July 10, 2002 4:00 PM
Subject: Re: [PIC]:how to use acceleration sensor for motion control?


> Hello
> I'm building a small robot and was planning to build a tilt sensor that
> should measure acceleration to.
> I only have the idea I haven't done any testing yet. The idea is to make a
> small pendulum with a ferrite
> bead as the weight. Near this will be a coil that is part of a tank
circuit
{Quote hidden}

> {Original Message removed}

2002\07\11@042117 by Mike Pink
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Jim

Just to add to my last you might want to look at Analog's ADXL202 or
ADXL05/50

Mike


----- Original Message -----
From: "Jim" <james3162spamspam_OUTWORLDNET.ATT.NET>
To: <@spam@PICLISTKILLspamspamMITVMA.MIT.EDU>
Sent: Wednesday, July 10, 2002 4:00 PM
Subject: Re: [PIC]:how to use acceleration sensor for motion control?


> Hello
> I'm building a small robot and was planning to build a tilt sensor that
> should measure acceleration to.
> I only have the idea I haven't done any testing yet. The idea is to make a
> small pendulum with a ferrite
> bead as the weight. Near this will be a coil that is part of a tank
circuit
{Quote hidden}

> {Original Message removed}

2002\07\11@052547 by Jim

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Thanks Mike the ADXL202 look very interesting but I could not find a small
quantity price for it.
Just looking around I see that digi-key has an 3 axis accelerometer for
25.00 it looks like
the kind of thing used in a gyro mouse.

Jim

{Original Message removed}

2002\07\12@005725 by Michael Rigby-Jones

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{Quote hidden}

I think you may have to use a bar magnet, the magnetic field would change
and even reverse as the ball bearing rolled!

Regards

Mike

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