tritium decay experiment acquired data from 14-5-2018 to 14-

J

Jan Panteltje

Guest
tritium decay experiment acquired data from 14-5-2018 to 14-5-2019 added to website
http://panteltje.com/panteltje/tri_pic/

'tronix is still working perfectly after what's? it now 6 years.

Temperature still OK 1 part in about 500.

will leave backup duracell batteries in (1.44 V per cell now),
as there is now a second external backup 11.1 V lipo against mains failures.

No idea when I feel up to analysing the data, but more data is good.

Proof you do not need peeseebees.
 
Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> wrote:
tritium decay experiment acquired data from 14-5-2018 to 14-5-2019 added to we
bsite
http://panteltje.com/panteltje/tri_pic/

'tronix is still working perfectly after what's? it now 6 years.

Temperature still OK 1 part in about 500.

will leave backup duracell batteries in (1.44 V per cell now),
as there is now a second external backup 11.1 V lipo against mains failures.

No idea when I feel up to analysing the data, but more data is good.

Proof you do not need peeseebees.
Click to expand...

Indeed. You can use FreeBSD on a Raspberry Pi and gpasm/sdcc to create a
lean and mean PIC binary. You may want to clean up this wording on your
webpage: "There is also a RS232 serial connection for the PC" because
the RS232 can just as easily connect to a Raspberry Pi or something else
that's not a PC.

Thank you, 73,

--
Don Kuenz KB7RPU
There was a young lady named Bright Whose speed was far faster than light;
She set out one day In a relative way And returned on the previous night.
 
On a sunny day (Tue, 14 May 2019 15:31:44 -0000 (UTC)) it happened Don Kuenz
<g@crcomp.net> wrote in <20190514a@crcomp.net>:

Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> wrote:

tritium decay experiment acquired data from 14-5-2018 to 14-5-2019 added to we
bsite
http://panteltje.com/panteltje/tri_pic/

'tronix is still working perfectly after what's? it now 6 years.

Temperature still OK 1 part in about 500.

will leave backup duracell batteries in (1.44 V per cell now),
as there is now a second external backup 11.1 V lipo against mains failures.

No idea when I feel up to analysing the data, but more data is good.

Proof you do not need peeseebees.

Indeed. You can use FreeBSD on a Raspberry Pi and gpasm/sdcc to create a
lean and mean PIC binary. You may want to clean up this wording on your
webpage: "There is also a RS232 serial connection for the PC" because
the RS232 can just as easily connect to a Raspberry Pi or something else
that's not a PC.

Thank you, 73,
Click to expand...

Many thanks I just see I uploaded my files to the wrong directory.. fixed now.

Yes raspberry only has USB, and then you need an USB to serial adaptor.

I fixed the text, OK now?
http://panteltje.com/panteltje/tri_pic/

Almost never use raspberries directly with a connected monitor and keyboard,
but always via ssh -Y IP_ADDRESS
Also I have fixed the raspies so I am always root in /etc/passwd
#pi:x:1000:1000:,,,:/home/pi:/bin/bash
pi:x:0:0:,,,:/root:/bin/bash
so I can get work done.

Mostly do PIC programming on the main PC with this:
http://panteltje.com/panteltje/pic/jppp18/index.html
have a special parport PCI card for that in the PC.

I run one raspberry as 4G router now with a Huawei 4G USB stick.
Canceled the cable connection.
Works perfectly so far, is cheaper than cable too, and works everywhere.

Took a while to figure out the scripting for that, if anybody is interested
ask here.
A 30$ raspi is also a lot cheaper that a 100$ or so 4G router..
 
In article <qbeu51$h7k$1@dont-email.me>,
Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> wrote:

>Yes raspberry only has USB, and then you need an USB to serial adaptor.

The Raspberry Pi has its own serial port - TX and RX pins are on the
GPIO header.

These are of the usual "microcontroller serial port" variety, using 0
and 3.3-volt levels. You'll need a level-converter/inverter to
connect them to anything which expects RS-232 or TTl voltage levels.
There are lots of MAX232-like chips which will do what's necessary.
 
On a sunny day (Tue, 14 May 2019 11:24:01 -0700) it happened
dplatt@coop.radagast.org (Dave Platt) wrote in
<1ndrqf-8t1.ln1@coop.radagast.org>:

In article <qbeu51$h7k$1@dont-email.me>,
Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> wrote:

Yes raspberry only has USB, and then you need an USB to serial adaptor.

The Raspberry Pi has its own serial port - TX and RX pins are on the
GPIO header.

These are of the usual "microcontroller serial port" variety, using 0
and 3.3-volt levels. You'll need a level-converter/inverter to
connect them to anything which expects RS-232 or TTl voltage levels.
There are lots of MAX232-like chips which will do what's necessary.
Click to expand...

Yes OK, and I posted recently about my GPS module connected to /dev/ttyAMA0
the GPS / GLONASS module has 3,3V out.
root@raspberrypi:~/compile/pantel/xgpspc# cat /dev/ttyAMA0
$GPRMC,184848.00,A,5315.08050,N,00535.98440,,140519,,,A*7F
$GPVTG,,T,,M,1.440,N,2.666,K,A*26
$GPGGA,184848.00,5315.08035.98525,E,1,05,4.03,14.8,M,45.7,M,,*63
$GPGSA,A,3,18,08,27,11,32,,,,,,,,6.04,4.03,4.50*03
$GPGSV,4,1,13,01,37,270,09,7,,08,73,192,26,10,42,059,*7C
$GPGSV,4,2,13,11,50,282,19,14,19,130,,18,65,274,22,20,15,054,*7B
$GPGSV,4,3,13,22,26,214,13,24,00,034,,27,41,148,24,28,2*73
....

happy now?

Anyways I also have a GPS with a serial to USB module:
http://panteltje.com/panteltje/xgpspc/USB_SERIAL_ADAPTOR_IMG_4962.JPG
just plug it into the PC or laptop with my software and you have GPS on /dev/ttyUSBX.
Needed an extra transistor but do not remember why, some pencil sketch between
a few hundred others.
More here:
http://panteltje.com/panteltje/xgpspc/index.html

and ..
well

There is a raspberry newsgroup too.

USB in general sucks, lots of problems, bad connectors, renumbering goes wrong in Linux,
only way out is ethernet, that always works.
No surprise, USB is a microsoft invention ;-)
But it is hard to get around it.
 
On 14/05/2019 12:10, Jan Panteltje wrote:
tritium decay experiment acquired data from 14-5-2018 to 14-5-2019 added to website
http://panteltje.com/panteltje/tri_pic/

'tronix is still working perfectly after what's? it now 6 years.

Temperature still OK 1 part in about 500.

will leave backup duracell batteries in (1.44 V per cell now),
as there is now a second external backup 11.1 V lipo against mains failures.

No idea when I feel up to analysing the data, but more data is good.
Click to expand...

I had a quick look. The best fit for data line n is

658.888-0.00524n
685.8974-0.005354n

That is consistent with half life of 9.78 and 9.84 respectively. So I
suspect some tritium is diffusing out of the package along the way.

The residuals have a hump around 2500-3000 about where the most 481's
occur in the temperature channel. Interestingly on one channel the
residuals hump is upwards and the other it is downwards. Taken together
they more or less cancel out so the half life is ~9.8+/-0.05.

The data is dominated by quantisation noise. Any chance of winding the
wick up a bit on the amplifiers to get a bigger number output?

--
Regards,
Martin Brown
 
Martin Brown wrote...
The data is dominated by quantisation noise.
Any chance of winding the wick up a bit on
the amplifiers to get a bigger number output?
Click to expand...

It's the ADC that's at fault. Instead of
a lousy ADC inside a micro-controller, Jan
needs to use a delta-sigma integrating ADC.


--
Thanks,
- Win
 
On 15/05/2019 12:26, Winfield Hill wrote:
Martin Brown wrote...

The data is dominated by quantisation noise.
Any chance of winding the wick up a bit on
the amplifiers to get a bigger number output?

It's the ADC that's at fault. Instead of
a lousy ADC inside a micro-controller, Jan
needs to use a delta-sigma integrating ADC.
Click to expand...

Ideally yes, but even a 12bit DAC PIC version would help a bit (as would
rescaling the temperature measurement so it really varies).

To stand any chance of detecting seasonal variations that were not just
temperature related it would need 22bit digitisation or better. I don't
expect to see any but there is no harm in looking.

Even with its limitations it is still a very nice half life
radioactivity demonstration experiment that schools could use in physics
classes. The world today is rather short of safe interesting high school
science experiments compatible with modern health and safety culture.

--
Regards,
Martin Brown
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top