## PSN-L Email List Message

Subject: Re: Folded Pendulum Design
From: "Jonathan Peakall" jpeakall@............
Date: Sun, 16 Feb 2003 07:44:19 -0800

```Brady,

>How would I go about integrating an A/D converter into my circuit that =
would have an output of >"  98156158 " for the values =
98, 156, 158?

You need a microcontroller, such as a Stamp or PIC. This reads the ADC =
and then sends the results and the control characters.

>How many samples per second does the 8 bit have compared to the 10 >bit =
and the 12 bit, and what exactly does bit mean?

Bits have nothing to do with sample rates. The sample rate depends on =
the ADC that you have. The 10 bit 12 bit thing has to do with the =
resolution of the ADC, not the speed. A 10 bit ADC returns (I believe) a =
number between 1 and 2048. A 12 bit returns a number between 1-4096. So =
smaller divisions can be acheived with an ADC with a higher bit rating.

HTH,

Jonathan

----- Original Message -----=20
To: psn-l@.................
Sent: Saturday, February 15, 2003 7:10 PM
Subject: FW: Folded Pendulum Design

I am currently a freshman at Colorado School of Mines and last =
semester for one of my classes I was required to design and build a =
working seismometer.  Our final design consisted of a folded pendulum =
which used magnetic induction, an amplifying filter circuit, an A/D =
converter, and Alan Jones' AmaSeis software.  I am continuing on with my =
folded pendulum design this semester and I am trying to make some =
improvements on it but I have some questions that I am having trouble =
finding the answer for so if anyone could help me find some answers I =
would really appreciate it. =20

=20

Where could I find a thin flexible metal sheet that I could use for =
the inverted pendulum joints?

Where could I find what I believe is called a PZ electro crystal (the =
crystal that expands when it receives a current) for testing our unit?

Where could I find information about optimizing the magnet / coil / =
damper system?

How would I go about integrating an A/D converter into my circuit that =
would have an output of "  98156158 " for the values 98, =
156, 158?

How many samples per second does the 8 bit have compared to the 10 bit =
and the 12 bit, and what exactly does bit mean?

=20

information you can contact me at bromberg@............

=20

=20

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>How would I go about =
integrating=20
an A/D converter into my circuit that would have an output of =
>=93  98<cr><lf>156<cr><lf>158=20
=93 for the values 98, 156, 158?

You need a =
microcontroller,=20
such as a Stamp or PIC. This reads the ADC and then sends the results =
and the=20
control characters.

>How many =
samples per=20
second does the 8 bit have compared to the 10 >bit and the 12 bit, =
and what=20
exactly does bit mean?

Bits have nothing =
to do with=20
sample rates. The sample rate depends on the ADC that you have. The 10 =
bit 12=20
bit thing has to do with the resolution of the ADC, not the speed. A 10 =
returns (I believe) a number between 1 and 2048. A 12 bit returns a =
number=20
between 1-4096. So smaller divisions can be acheived with an ADC with a =
higher=20
bit rating.

HTH,

Jonathan

----- Original Message -----
From:=20
Romberg=20

To: psn-l@..............
Sent: Saturday, February 15, =
2003 7:10=20
PM
Subject: FW: Folded Pendulum =
Design

I am currently a =
freshman at=20
Colorado School of Mines and last semester for one of my classes I was =

required to design and build a working seismometer.  Our final design consisted =
of a folded=20
pendulum which used magnetic induction, an amplifying filter circuit, =
an A/D=20
converter, and Alan Jones=92 AmaSeis software.  I am continuing on with my =
folded=20
pendulum design this semester and I am trying to make some =
improvements on it=20
but I have some questions that I am having trouble finding the answer =
for so=20
if anyone could help me find some answers I would really appreciate =
it.  =

Where could I find a =
thin flexible=20
metal sheet that I could use for the inverted pendulum=20
joints?
Where could I find what =
I believe=20
is called a PZ electro crystal (the crystal that expands when it =
current) for testing our unit?
Where could I find =
information=20
about optimizing the magnet / coil / damper=20
system?
How would I go about =
integrating=20
an A/D converter into my circuit that would have an output of =93  98<cr><lf>156<cr><lf>158=20
=93 for the values 98, 156, 158?
How many samples =
per=20
second does the 8 bit have compared to the 10 bit and the 12 bit, and =
what=20
exactly does bit mean?

If you have any =
questions=20