speed telemetry
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I want to find the instaneous speed in MPH as I do inline skating.
A magnet could be place in the front wheel (about 80mm dia) with a
pick sensor over the wheel. Convert digital to analog and transmit to
a wrist computer to read out velocity.
Anyone smart enough to figure out how to do this?
Another way would be to buy a bicycle cordless unit and figure out
how to increase the transmission distance from 17in to about 6 ft. I
suppose.
Your thoughts. Anyone for hire?
A magnet could be place in the front wheel (about 80mm dia) with a
pick sensor over the wheel. Convert digital to analog and transmit to
a wrist computer to read out velocity.
Anyone smart enough to figure out how to do this?
Another way would be to buy a bicycle cordless unit and figure out
how to increase the transmission distance from 17in to about 6 ft. I
suppose.
Your thoughts. Anyone for hire?
Comments
balance is a consideration on a small wheel, balance the wheel with 2
magnets at opposite ends of a wheel diameter, and count every other pulse.
I'd go this route instead of optical.
Dennis
Original Message
From: Dan Gustafson <dankgus@e...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Date: Wednesday, November 01, 2000 9:39 AM
Subject: Re: [noparse][[/noparse]basicstamps] speed telemetry
>You might look into an optical pickup rather than a magnet, as it will
>probably be easier and you wont have to put a wheel out of balance with a
>magnet.
>
>--Dan
>
Original Message
>From: <healer4u@m...>
>To: <basicstamps@egroups.com>
>Sent: Wednesday, November 01, 2000 7:04 AM
>Subject: [noparse][[/noparse]basicstamps] speed telemetry
>
>
>> I want to find the instaneous speed in MPH as I do inline skating.
>>
>> A magnet could be place in the front wheel (about 80mm dia) with a
>> pick sensor over the wheel. Convert digital to analog and transmit to
>> a wrist computer to read out velocity.
>>
>>
>> Anyone smart enough to figure out how to do this?
>>
>> Another way would be to buy a bicycle cordless unit and figure out
>> how to increase the transmission distance from 17in to about 6 ft. I
>> suppose.
>>
>> Your thoughts. Anyone for hire?
>>
>>
>>
>>
>>
>
>
>
>
probably be easier and you wont have to put a wheel out of balance with a
magnet.
--Dan
Original Message
From: <healer4u@m...>
To: <basicstamps@egroups.com>
Sent: Wednesday, November 01, 2000 7:04 AM
Subject: [noparse][[/noparse]basicstamps] speed telemetry
> I want to find the instaneous speed in MPH as I do inline skating.
>
> A magnet could be place in the front wheel (about 80mm dia) with a
> pick sensor over the wheel. Convert digital to analog and transmit to
> a wrist computer to read out velocity.
>
>
> Anyone smart enough to figure out how to do this?
>
> Another way would be to buy a bicycle cordless unit and figure out
> how to increase the transmission distance from 17in to about 6 ft. I
> suppose.
>
> Your thoughts. Anyone for hire?
>
>
>
>
>
Ray McArthur
Original Message
From: Dennis O'Leary <doleary@h...>
To: <basicstamps@egroups.com>
Sent: Wednesday, November 01, 2000 3:18 PM
Subject: Re: [noparse][[/noparse]basicstamps] speed telemetry
> DigiKey sells some very small magnets for use with Hall effect sensors.
If
> balance is a consideration on a small wheel, balance the wheel with 2
> magnets at opposite ends of a wheel diameter, and count every other pulse.
> I'd go this route instead of optical.
> Dennis
>
Original Message
> From: Dan Gustafson <dankgus@e...>
> To: basicstamps@egroups.com <basicstamps@egroups.com>
> Date: Wednesday, November 01, 2000 9:39 AM
> Subject: Re: [noparse][[/noparse]basicstamps] speed telemetry
>
>
> >You might look into an optical pickup rather than a magnet, as it will
> >probably be easier and you wont have to put a wheel out of balance with a
> >magnet.
> >
> >--Dan
> >
Original Message
> >From: <healer4u@m...>
> >To: <basicstamps@egroups.com>
> >Sent: Wednesday, November 01, 2000 7:04 AM
> >Subject: [noparse][[/noparse]basicstamps] speed telemetry
> >
> >
> >> I want to find the instaneous speed in MPH as I do inline skating.
> >>
> >> A magnet could be place in the front wheel (about 80mm dia) with a
> >> pick sensor over the wheel. Convert digital to analog and transmit to
> >> a wrist computer to read out velocity.
> >>
> >>
> >> Anyone smart enough to figure out how to do this?
> >>
> >> Another way would be to buy a bicycle cordless unit and figure out
> >> how to increase the transmission distance from 17in to about 6 ft. I
> >> suppose.
Industral tachometers often are use with a small reflective spot, say
1/4 inch to 1 inch on a 2 inch round shaft. Then count the
reflections as revolutions. The application is simple.
As regards calibration, you might be able to use a known speed like a
(are you ready for this?) a belt sander! Just don't use sandpaper!
Dave
--- In basicstamps@egroups.com, "Dan Gustafson" <dankgus@e...> wrote:
> You might look into an optical pickup rather than a magnet, as it
will
> probably be easier and you wont have to put a wheel out of balance
with a
> magnet.
>
> --Dan
>
Original Message
> From: <healer4u@m...>
> To: <basicstamps@egroups.com>
> Sent: Wednesday, November 01, 2000 7:04 AM
> Subject: [noparse][[/noparse]basicstamps] speed telemetry
>
>
> > I want to find the instaneous speed in MPH as I do inline skating.
> >
> > A magnet could be place in the front wheel (about 80mm dia) with a
> > pick sensor over the wheel. Convert digital to analog and
transmit to
> > a wrist computer to read out velocity.
> >
> >
> > Anyone smart enough to figure out how to do this?
> >
> > Another way would be to buy a bicycle cordless unit and figure out
> > how to increase the transmission distance from 17in to about 6
ft. I
> > suppose.
> >
> > Your thoughts. Anyone for hire?
> >
> >
> >
> >
> >