yeah, I agree!

ps.: I didn't noticed but the sensors sold on the website are kind of second hand!

...These geophones are pulled from working equipment but are re-certified from distributor and guaranteed...

that's exactly what I was looking for,  I found so many videos of the sensitivity of this device, for example
I'll try do build it following the instructions!
Anyway I'm going to buy one of these!..

thanks! 

Hi there!
I'm trying without much successful to measure mechanical vibrations at low frequencies, for example, people moving on a concrete ramp, or  cars moving on the street creating small vibrations on the floor. I've tried several piezo elements but I think I need a better current amplifiers for these elements.
Anyway, does anybody has tried it before? do you have any idea of circuit or sensors?

thanks

isso não é problema no java?
bom, tenta baixar a IDE mais nova... http://arduino.googlecode.com/files/arduino-0022.zip

ótimo exemplo
vc pode ver datastream de um contador geiger no japão agora,,
http://www.pachube.com/?q=geiger

existe um outro projeto para monitoramento de gasto de energia
http://openenergymonitor.org/emon/

I don't know how many moderators for the whole forum, but in case of a specific moderator for Portuguese in International section  I think I can help!

a novas versões da IDE do Arduino já incluem no core uma implementação da função Tone
veja em
http://arduino.cc/en/Reference/Tone
sendo assim vc não precisa incluir nenhuma lib no entanto vc precisa inicializar corretamente as instâncias do tipo Tone.

hey Leon,
the sensors of irisys looks very interesting however we're not going to spent to much money.
I guess that using a few of ultrasonic range finders like Maxsonar my problem can be solved as well as I don't need the precisely the position of the people but only the parameter of how people are moving around.
 
is there any open-source, open-hardware in you company? Irisys?

hey guys,
thanks the answers,
the place is about half a tennis court then people are going to dance around over this and we wish to make the illumination, lights over,  change some way according to people movement!
I remember Seeedstudio sold a piezo electric wire sensor that you could measure when someone stepped on it, but I can't find anymore...

Hi folks,

I'd like to sense people moving around a huge space but I don't want to use computer vision also I though about acelerometer in each person but it could be expensive, so does anybody has different ideas?


thanks

is there any website where I can see the details of the project?

I'm not sure if it work for you
http://www.seeedstudio.com/depot/electronic-brick-electricity-meteranalog-p-471.html?cPath=144_154&zenid=b6be7f3439927ffb98888b4bdd6b6d96

O newton C braga é clássico!

você quer programar o arduino pela porta paralela?
ou so quer gravar o bootloader no chip atmeg utlizando a porta paralela?

você já tentou programar algo em um Arduino?
como um sensor de temperatura?
já programa em alguma linguagem?