Subject:
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RE: Motion/Tilt Sensor from Analog Devices and the RCX
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 16 Oct 2000 14:49:41 GMT
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Original-From:
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<rat@telecoma.*ihatespam*net>
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Viewed:
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934 times
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hi,
just some additional information of how people use the sensor:
http://www.ibr.cs.tu-bs.de/%7Eharbaum/pilot/adxl202.html
best
erich
On Mon, 16 Oct 2000, Jeffrey Hazen wrote:
> Not exactly.... The output is an analog voltage, meaning it's not exactly
> a digital TTL 0 volts or 5 volts, but ranges from 200mv (call this low) to
> Vcc-200mv (call this high). But this is a PWM output, meaning that with
> the chip stationary with normal gravity, the duty cycle is 50% (1 ms low, 1
> ms high for example). Any change due to (and only during) acceleration
> will show up as a change in duty cycle (0.5 ms low, 1.5 ms high for
> example). While you can apparently set the base clock duty cycle to be as
> long as 10ms, you still have to measure two channels (x and y). I don't
> think the RCX is capable of the timing required to do this, so it's going
> to be necessary to use an external micro.
>
> Jeff
>
> Jeffrey Hazen
> North Mill Technology
> jeffrey.hazen@northmill.net
>
> -----Original Message-----
> From: Ram Meenakshisundaram [SMTP:rmeenaks@olf.com]
> Sent: Monday, October 16, 2000 9:33 AM
> To: lugnet.robotics.rcx@lugnet.com; lugnet.robotics@lugnet.com
> Subject: Re: Motion/Tilt Sensor from Analog Devices and the RCX
>
> Sorry for my ignorance, but doesnt the datasheets mention that it
> contains both analog and digital outputs and either may be used.
>
>
> Ram
>
> Jeffrey Hazen wrote:
> >
> > > From looking at the data sheets, it's going to be a bit more of a • project
> > than just "hooking it up". At a minimum you'll need to have a small • micro
> > to decode the dual PWM outputs, and they (AD) have a data sheet • describing
> > the use of a Parallax Basic Stamp. There will be a lot of algorithm
> > development to turn the acceleration data into something useful, like say
> > inertial navigation, and you'd eventually need a gyro to deal with • rotation
> > in the x-y plane. It would be an interesting project.
> >
> > My two Cents,
> >
> > Jeff
> >
> > Jeffrey Hazen
> > North Mill Technology
> > jeffrey.hazen@northmill.net
> >
> > -----Original Message-----
> > From: Ram Meenakshisundaram [SMTP:rmeenaks@olf.com]
> > Sent: Sunday, October 15, 2000 3:05 PM
> > To: lugnet.robotics.rcx@lugnet.com; lugnet.robotics@lugnet.com
> > Subject: Motion/Tilt Sensor from Analog Devices and the RCX
> >
> > Hi,
> >
> > I just order two free samples of Analog Devices ADXL202E at
> > http://products.analog.com/products/info.asp?product=ADXL202. Anyone
> > know if this can be hooked up to the RCX?
> >
> > Ram
> >
> > PS: Try to get a free subscription to "Sensors". It is a really cool
> > magazine...
> >
> >
> >
>
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