[SS2S-Main] Re: Digital scale load-cell design / instrumentation
- From: vicente Alvero Zambrano <vicente_alvero_14@xxxxxxxxxxx>
- To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx>
- Date: Sun, 19 Jan 2014 09:09:09 +0100
So what option do you prefer?
From: mattias.lampe@xxxxxxxxxxx
To: sugarshot@xxxxxxxxxxxxx
Date: Sun, 19 Jan 2014 11:32:21 +0800
Subject: [SS2S-Main] Re: Digital scale load-cell design / instrumentation
The load cell itself has an analog output, and there are a number of integrated
circuits or modules to amplify and A/D convert the signal. Speed is typically
between 10-100 samples per second, which should be sufficient. You are right
that bathroom scales are slow, but that’s not due to the load cell itself but
rather caused by the signal processing (averaging) in the display unit. You are
also right that a microcontroller
is sufficient to collect the load cell data. The PC is merely for
display/storage/post processing.
Mattias
From: sugarshot-bounce@xxxxxxxxxxxxx [mailto:sugarshot-bounce@xxxxxxxxxxxxx]
On Behalf Of m bindhammer
Sent: Saturday, January 18, 2014 10:48 PM
To: sugarshot@xxxxxxxxxxxxx
Subject: [SS2S-Main] Re: Digital scale load-cell design / instrumentation
Is the communication protocol of a kitchen/bathroom scale load cell analog or
digital? 2000N should be the max. what a bathroom scale could measure (approx
200
kg). Sampling rate would be interesting and important too. Most bathroom
scales are very slow. However, it is pretty easy to design according
electronics/data logger for it. You could do this embedded with a micro
controller and SD card, you don't need a PC.
Markus
From:
vicente_alvero_14@xxxxxxxxxxx
To: sugarshot@xxxxxxxxxxxxx
Subject: [SS2S-Main] Re: Digital scale load-cell design / instrumentation
Date: Sat, 18 Jan 2014 13:41:23 +0100
maybe Richard, can design and build a load cell based on websites, and another
member of the electronic
From:
vicente_alvero_14@xxxxxxxxxxx
To: sugarshot@xxxxxxxxxxxxx
Subject: [SS2S-Main] Re: Digital scale load-cell design / instrumentation
Date: Sat, 18 Jan 2014 13:36:17 +0100
I have not just knowledge of electronics, so this work should be made between
several members
To:
sugarshot@xxxxxxxxxxxxx
Subject: [SS2S-Main] Re: Digital scale load-cell design / instrumentation
From: monsieurboo@xxxxxxx
Date: Sat, 18 Jan 2014 07:11:34 -0500
It's been a few years since discussion of these digital-scale load cells was
ricocheting around the rocketry forums. Naturally, I started by checking
Nakka's site -- he's got
a very cool "built from scratch" strain-gage design but I couldn't find one
there that starts with a digital scale. But here's a good starting point for
what you're talking about. This one hooks up to a PC with a "COM port" USB
interface, and the author
hand-rolled the electronics.
http://www.steeman.be/?p=192
Enjoy!
Mark L.
DC
-----Original Message-----
From: vicente Alvero Zambrano <vicente_alvero_14@xxxxxxxxxxx>
To: sugarshot <sugarshot@xxxxxxxxxxxxx>
Sent: Sat, Jan 18, 2014 3:54 am
Subject: [SS2S-Main] Re: Interesting Motor-Design Documents
Hi Mattias,
It would be great if you could you do this. I think the maximum thrust is
2000N, but better than Richard confirm it.
Vicente Alvero
From:
mattias.lampe@xxxxxxxxxxx
To: sugarshot@xxxxxxxxxxxxx
Date: Sat, 18 Jan 2014 10:37:27 +0800
Subject: [SS2S-Main] Re: Interesting Motor-Design Documents
If you want to go even cheaper, load cells can be scavenged from cheap digital
kitchen/bathroom scales. It’s not too difficult to hook them up to a computer. I
can probably help with the electronics, but not so much with the mechanical
part.
What would be the maximum force to be measured?
Mattias
From:
sugarshot-bounce@xxxxxxxxxxxxx [mailto:sugarshot-bounce@xxxxxxxxxxxxx]
On Behalf Of vicente Alvero Zambrano
Sent: Friday, January 17, 2014 12:47 AM
To: sugarshot@xxxxxxxxxxxxx
Subject: [SS2S-Main] Re: Interesting Motor-Design Documents
Instruments would be a gauge and load cell, right? but this must be commercial.
some sets is "cheap". with relative to a support, I think we would have
problems.
that would be cheap.
http://aeroconsystems.com/cart/load-cells/
maybe we can also use the pressure gauge and load cell minisshot rocket.
Date: Thu, 16 Jan 2014 10:30:00 -0600
Subject: [SS2S-Main] Re: Interesting Motor-Design Documents
From: richard.nakka@xxxxxxxxx
To: sugarshot@xxxxxxxxxxxxx
To design/build the instruments to measure motor thrust and chamber pressure.
We would have to do this on a "tight" budget.
R.
On Thu, Jan 16, 2014 at 10:18 AM, vicente Alvero Zambrano
<vicente_alvero_14@xxxxxxxxxxx> wrote:
What kind of help with the instrumentation?
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