AW: [basicstamps] sound detection
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Hi Al,
thanks for reply, I didn't explain good enough what this is all about, sorry
for my poor language...
It is not really a helmet, it is more like a hood that will be fixed and the
person just put his /her head under the hood, without contact. (Like the
strange thjings old ladies use to dry their hair...).
The problem with pid-devices is that they can only say yes, it moves or no,
it doesnot. I would prefer a device that can tell me how quick or how much
or how far the head moves.
Could you go a lil more into detail about the microphone thing? What kind of
mic can I use, how do I amplify it and what would this comparator look like,
just an op-amp?
You see, I am not very cool in electronix though I fumble my way along this
world for ten years now...;-)
Thanx again, Al,
Greetings, Uli
Urspr
thanks for reply, I didn't explain good enough what this is all about, sorry
for my poor language...
It is not really a helmet, it is more like a hood that will be fixed and the
person just put his /her head under the hood, without contact. (Like the
strange thjings old ladies use to dry their hair...).
The problem with pid-devices is that they can only say yes, it moves or no,
it doesnot. I would prefer a device that can tell me how quick or how much
or how far the head moves.
Could you go a lil more into detail about the microphone thing? What kind of
mic can I use, how do I amplify it and what would this comparator look like,
just an op-amp?
You see, I am not very cool in electronix though I fumble my way along this
world for ten years now...;-)
Thanx again, Al,
Greetings, Uli
Urspr
Comments
thanx again for your detailed explanation. I like the IR-idea for the hood.
But there is one thing missing: the explanations by "Rich" that you refer to
never reached me... Did he post it in the group? I cannot find it...
Could you forward it?
Thanx and Hi Ho,
Uli
Urspr
Many years ago, we used to detect the movement of fruit flies (yes, we were
VERY bored) over 24 hour periods to study circadian rhythms. I used a
reflective IR pair into an amplifier to get a Vcc/2 level (requires a
baseline and gain adjustments). We then differentiated this signal to get
movement information. You can get speed, distance, and direction from this
configuration. This was processed with an 8080 home brew system and worked
pretty well for 1024 channels, so I imagine you could do a lot more with a
stamp monitoring this output!
Mike
At 02:38 PM 8/2/2001 +0200, you wrote:
>Hi Al,
>
>thanks for reply, I didn't explain good enough what this is all about, sorry
>for my poor language...
>
>It is not really a helmet, it is more like a hood that will be fixed and the
>person just put his /her head under the hood, without contact. (Like the
>strange thjings old ladies use to dry their hair...).
>
>The problem with pid-devices is that they can only say yes, it moves or no,
>it doesnot. I would prefer a device that can tell me how quick or how much
>or how far the head moves.
>
>Could you go a lil more into detail about the microphone thing? What kind of
>mic can I use, how do I amplify it and what would this comparator look like,
>just an op-amp?
>
>You see, I am not very cool in electronix though I fumble my way along this
>world for ten years now...;-)
>
>Thanx again, Al,
>
>Greetings, Uli
>
>
_________________________________
Mike Walsh
walsh@i...
sensors which don't interfere with each other. Current angular rate
sensors use a driven "tuning fork" in proximity of a sensing
fork. Bending of the fork tips occurs due to coriolis forces, and angular
velocity is produced by capacitance changes of the fork tips. A
single-axis head velocity sensor is shown at www.4wsr.com
Dennis
WSR, Inc
Pasadena CA
On Thu, 2 Aug 2001, ulibasic wrote:
> Hi Al,
>
> thanks for reply, I didn't explain good enough what this is all about, sorry
> for my poor language...
>
> It is not really a helmet, it is more like a hood that will be fixed and the
> person just put his /her head under the hood, without contact. (Like the
> strange thjings old ladies use to dry their hair...).
>
> The problem with pid-devices is that they can only say yes, it moves or no,
> it doesnot. I would prefer a device that can tell me how quick or how much
> or how far the head moves.
>
> Could you go a lil more into detail about the microphone thing? What kind of
> mic can I use, how do I amplify it and what would this comparator look like,
> just an op-amp?
>
> You see, I am not very cool in electronix though I fumble my way along this
> world for ten years now...;-)
>
> Thanx again, Al,
>
> Greetings, Uli
>
>
>
>
>
>
Urspr
it is really great (big huge) fun to get so much help, thanx all of you. I
will chew on all those interesting ideas for a while, I think I will get
along with what I know now.
One thing I am still missing is the idea of 'Rich' that Al referred to, I
don't know why I missed it or didnt receive it..?
Mike Hardwicks animal detector sounds great, the schematics on the web is
hard to read, I will try and get a copy from EDN-Magazine, I hope I can
manage to build it.
Now let me go to my soldering table and have a look at that miracle thing
called LM 386
THANK YOU ALL FOR YOUR HELP!
sunny day, uli
Urspr
I found an interesting sensor chip from a dutch company that might solve my
problem and could be very interesting for some of you maybe.
Check for the UTI-chip at www.smartec.nl
take care, uli
Urspr
>
> Mike Hardwicks animal detector sounds great, the
schematics on the web is
> hard to read, I will try and get a copy from
EDN-Magazine, I hope I can
> manage to build it.
>
If you do get a copy of EDN, could you post a legible
copy of the schematic and the program listing. It sounds
like something that I might have use for.
Bob
nienhuis@w...