Home made Anemometer and count pulses.

Archiver

Hi all,

I have a small problem...


I have made a anemometer that is 32 cm in wingspan (32 cm * 3.14) ~
1 meter, alse glued a magnet and a Hallsensor to that.

I hock up a speedmaster (bike computer) an enter the value of 1003
mm (weel diameter)

I use a hairdryer (cold air) to have the same speed for my
anemometer.

I use a Basic stamp II and the count command: count 0,1000, windspeed

This would get me pulses per second and the BSII is showing ~ 12
something, should be pulses times 1 meter = 12 meter per second....

The problem I have is that the Bike computer also shows ~ 12 kph.


My bakground calculation is like this,

If I travel 30 Kmh, thats 30.000 meter per hour, divide that with 60
and you get 500 meter per minute.

Divide 500 meter with 60 and you get 8.3 meter per second.


So, is the BS II or the bike computer showing the right value of
meter per second.....



Please help a newbie...

Regards, Robert.

Archiver

Hello robert_tarnell_se,

Your wheel diameter looks like 64 cm, the 1 meter is the wheel
circumference. Might that be it?

a.r.

Saturday, March 09, 2002, 14:14:04, you wrote:

r> Hi all,

r> I have a small problem...


r> I have made a anemometer that is 32 cm in wingspan (32 cm * 3.14) ~
r> 1 meter, alse glued a magnet and a Hallsensor to that.

r> I hock up a speedmaster (bike computer) an enter the value of 1003
r> mm (weel diameter)

Archiver

At 14:14 03/09/02, robert_tarnell_se wrote:

>I have made a anemometer that is 32 cm in wingspan (32 cm * 3.14) ~
>1 meter, alse glued a magnet and a Hallsensor to that.
>
>I hock up a speedmaster (bike computer) an enter the value of 1003
>mm (weel diameter)
>
>I use a hairdryer (cold air) to have the same speed for my
>anemometer.
>
>I use a Basic stamp II and the count command: count 0,1000, windspeed
>
>This would get me pulses per second and the BSII is showing ~ 12
>something, should be pulses times 1 meter = 12 meter per second....
>
>The problem I have is that the Bike computer also shows ~ 12 kph.
>
>
>My bakground calculation is like this,
>
>If I travel 30 Kmh, thats 30.000 meter per hour, divide that with 60
>and you get 500 meter per minute.
>
>Divide 500 meter with 60 and you get 8.3 meter per second.
>
>
>So, is the BS II or the bike computer showing the right value of
>meter per second.....


The value the Stamp shows is 12 revolutions per second, or 12 m/second, or
43.2 kph

The value the bike computer shows is 12 kph, or 3.33 m/second, or 3
revolutions per second.

Look at it and decide which makes more sense, 3 revs/sec or 12 revs per sec
and that's the one that's correct - or at least more correct than the other.


Jim H

Archiver

--- In basicstamps@y..., Jim Higgins <HigginsJ@s...> wrote:
> At 14:14 03/09/02, robert_tarnell_se wrote:
>
> >I have made a anemometer that is 32 cm in wingspan (32 cm * 3.14)
~
> >1 meter, alse glued a magnet and a Hallsensor to that.
> >
> >I hock up a speedmaster (bike computer) an enter the value of 1003
> >mm (weel diameter)
> >
> >I use a hairdryer (cold air) to have the same speed for my
> >anemometer.
> >
> >I use a Basic stamp II and the count command: count 0,1000,
windspeed
> >
> >This would get me pulses per second and the BSII is showing ~ 12
> >something, should be pulses times 1 meter = 12 meter per
second....
> >
> >The problem I have is that the Bike computer also shows ~ 12 kph.
> >
> >
> >My bakground calculation is like this,
> >
> >If I travel 30 Kmh, thats 30.000 meter per hour, divide that with
60
> >and you get 500 meter per minute.
> >
> >Divide 500 meter with 60 and you get 8.3 meter per second.
> >
> >
> >So, is the BS II or the bike computer showing the right value of
> >meter per second.....
>
>
> The value the Stamp shows is 12 revolutions per second, or 12
m/second, or
> 43.2 kph
>
> The value the bike computer shows is 12 kph, or 3.33 m/second, or
3
> revolutions per second.
>
> Look at it and decide which makes more sense, 3 revs/sec or 12
revs per sec
> and that's the one that's correct - or at least more correct than
the other.
>
>
> Jim H

Hello Jim,

You are right, I have one green cup, and the other 3 is black, so I
can easy see that there is NO rotation of 12 times per second, of
course......*hmm*

But then I have a problem, the basic stamp reads more *pulses* then
it should, I have a 10k resistor between P0 and VDD, then the
hallsensor is connected to VSS and the resistor (the P0 side).

Should I use Button, RCtime, other resistors????

Please help...

Archiver

--- In basicstamps@y..., "a.rodriguez" <stuff@m...> wrote:
> Hello robert_tarnell_se,
>
> Your wheel diameter looks like 64 cm, the 1 meter is the wheel
> circumference. Might that be it?
>
> a.r.
>
> Saturday, March 09, 2002, 14:14:04, you wrote:
>
> r> Hi all,
>
> r> I have a small problem...
>
>
> r> I have made a anemometer that is 32 cm in wingspan (32 cm *
3.14) ~
> r> 1 meter, alse glued a magnet and a Hallsensor to that.
>
> r> I hock up a speedmaster (bike computer) an enter the value of
1003
> r> mm (weel diameter)

Hello,

Sorry for the confusion, I meant circumference...

(32 cm * 3.141592654 = 100.53 cm or ~ 1000 mm)

But I think it have more with that the BSII reads more pulses then
there is....

I will try some more stuff today, using a button instead of a
hallsensor and magnet..

Thank you, Robert.

Archiver

--- In basicstamps@y..., "robert_tarnell_se" <raptor_ghost@h...>
wrote:
> --- In basicstamps@y..., Jim Higgins <HigginsJ@s...> wrote:
> > At 14:14 03/09/02, robert_tarnell_se wrote:
> >
> > >I have made a anemometer that is 32 cm in wingspan (32 cm *
3.14)
> ~
> > >1 meter, alse glued a magnet and a Hallsensor to that.
> > >
> > >I hock up a speedmaster (bike computer) an enter the value of
1003
> > >mm (weel diameter)
> > >
> > >I use a hairdryer (cold air) to have the same speed for my
> > >anemometer.
> > >
> > >I use a Basic stamp II and the count command: count 0,1000,
> windspeed
> > >
> > >This would get me pulses per second and the BSII is showing ~ 12
> > >something, should be pulses times 1 meter = 12 meter per
> second....
> > >
> > >The problem I have is that the Bike computer also shows ~ 12
kph.
> > >
> > >
> > >My bakground calculation is like this,
> > >
> > >If I travel 30 Kmh, thats 30.000 meter per hour, divide that
with
> 60
> > >and you get 500 meter per minute.
> > >
> > >Divide 500 meter with 60 and you get 8.3 meter per second.
> > >
> > >
> > >So, is the BS II or the bike computer showing the right value of
> > >meter per second.....
> >
> >
> > The value the Stamp shows is 12 revolutions per second, or 12
> m/second, or
> > 43.2 kph
> >
> > The value the bike computer shows is 12 kph, or 3.33 m/second,
or
> 3
> > revolutions per second.
> >
> > Look at it and decide which makes more sense, 3 revs/sec or 12
> revs per sec
> > and that's the one that's correct - or at least more correct
than
> the other.
> >
> >
> > Jim H
>
> Hello Jim,
>
> You are right, I have one green cup, and the other 3 is black, so
I
> can easy see that there is NO rotation of 12 times per second, of
> course......*hmm*
>
> But then I have a problem, the basic stamp reads more *pulses*
then
> it should, I have a 10k resistor between P0 and VDD, then the
> hallsensor is connected to VSS and the resistor (the P0 side).
>
> Should I use Button, RCtime, other resistors????
>
> Please help...


Doing some homework and using the Stamp plot lite, I saw that my
hallsensor did not show a perfekt count.

I tryed using a ordinary switch instead, pressing that 4 times per
second, everything did work fine then...

So, off to nerest shop for a new type of sensor thats working with
my anemometer......(the sensor works fine with the bike computer, so
maybe there is some thing going on there)


Thanx, Robert.