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I need the customized flex sensors
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Please be positive and constructive with your questions and comments.

I need the customized flex sensors

by chienta on Mon Apr 05, 2010 9:25 am

Dear everyone:

The requirement in my minds is that the flex sensors has a resistance of 0 ohms to 5K ohms and increase while it is bent.
But the general product of that is so big and casual. Also, part of them is decrease when it is bent and that is not fit for what I need. :(

Do someone know who can make it for me? I really appreciate that. :o
Thanks for your reply.
chienta
 
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Re: I need the customized flex sensors

by adafruit on Mon Apr 05, 2010 11:22 pm

getting flex sensors customized will be much harder than just getting your circuit to work properly with existing ones

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Re: I need the customized flex sensors

by zener on Tue Apr 06, 2010 12:11 am

I think we will have to know your application, which I am guessing is top secret...

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Re: I need the customized flex sensors

by chienta on Tue Apr 06, 2010 3:55 am

to adafruit & zener:

No, it's not secret.
I'm still a student and make experiment in product.

I want to use the flex sensors to adjust the volume of the speakers.
But an operational amplifier I know is LM-386 which provide a resistance of approximately 10,000 ohms. You know, However, an un flexed sensor has already a resistance of 10,000.

How can I make it for what I need.
I really thanks for your reply.
chienta
 
Posts: 3
Joined: Mon Apr 05, 2010 9:22 am

Re: I need the customized flex sensors

by johngineer on Tue Apr 06, 2010 10:22 am

chienta wrote:I want to use the flex sensors to adjust the volume of the speakers.
But an operational amplifier I know is LM-386 which provide a resistance of approximately 10,000 ohms. You know, However, an un flexed sensor has already a resistance of 10,000.


I'm not sure what you're referring to as 10,000 ohms: the input resistance (which on the 386 is more like 50k), the impedance in your feedback network, or some other impedance. Or perhaps you're not talking about any of those.

Also, it would be helpful if you posted a link to the flex sensors you are currently looking at that you consider unacceptable.
Adafruit Director of Imaging
Member of Technical Staff
Poles up, zeroes down.
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Re: I need the customized flex sensors

by adafruit_support_bill on Tue Apr 06, 2010 10:50 am


adafruit_support_bill
 
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Re: I need the customized flex sensors

by zener on Tue Apr 06, 2010 1:22 pm

What is flexing? There are many ways to sense this, but we need a visual.

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Re: I need the customized flex sensors

by chienta on Wed Apr 07, 2010 4:39 am

Hi All:

I have posted the picture in this link:
http://picasaweb.google.com.tw/11033143 ... 86Circuit#

Three of picture mentioned the problem in currently, when I used an flex sensor and increase an resistance, the sound became small, but not silence.
How can I make it like an trimpot so accurate to eliminate the sound.

(By the way, I used the component of a 220uF capacitor, a 474 ceramic capacitor, and 10 ohms to connect Pin 5 of an LM 386. Another, I gave Pin 6 a 9V battery and Pin 3 a flex sensor with 10Kohms to adjust the volume of sound.)

Please give me a sign. And thanks much in advance.
chienta
 
Posts: 3
Joined: Mon Apr 05, 2010 9:22 am

Please be positive and constructive with your questions and comments.