When I started 3d printing (Prusa i3 m3), I bought a lot of cheap filament.
I printed a roll of cheap black ABS ($10/roll on amazon), and found my printer didn't work anymore. The cause was a significantly expanded nozzle.
New Rule...Have lots of spare cheap brass nozzles. Use a new nozzle every time you change nozzle size.
The dull grey is Amazon basics PLA, the shiny grey is Ebay cheap grey. The Ebay stuff has poor adhesion (for PLA), is super fragile (filament breaks every time i weigh it), but looks great.
Both cheap filaments have horrible bridging. The cheap grey is so bad I had to add extra layers on top.
This Blog is about home engineering projects. Progress in physics is getting very difficult as can be seen by both the decline in frequency of discoveries, and the cost. The LHC cost more than 13 billion dollars, just to discover one particle. Even as the fundamental sciences become more difficult, the applied sciences (Engineering) are getting easier. Consequently, we are in the Age of Engineering.
Sunday, January 20, 2019
Tuesday, July 4, 2017
Solar System Two
Trying to meet CPAP requirements:
http://www.healthyresources.com/sleep/magazines/psnews/power03.html
here are the three parts:
the panels, order now on ebay ($160)
http://www.ebay.com/itm/Mono-Poly-PV-Solar-Panel-160W-100W-90W-40W-25W-10W-5W-12V-24V-RV-Boat-Camping/361878817780?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649Costco batteries:
best is 140wh (2 70wh deep cycle costco batteries)
charge controller:
http://www.ebay.com/itm/5-10-15-20-30A-PWM-Solar-Panel-Battery-Regulator-Charge-Controller-CE-12V-24VMS-/272672199604?var=&hash=item3f7c8793b4extension cables:
http://www.ebay.com/itm/1-Pair-TEMCo-10ft-MC4-Solar-Panel-Extension-Connector-12-AWG-PV-Cable-Wire/281368913995?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649Wednesday, February 15, 2017
Inexpensive Solar system
Solar panel Notes:
Optimum angle for solar
Fixed--~30
Degrees
Two season
Summer
(march 30-september 12th)- ~8 degrees
Winter
(rest of year ~45 degrees).
Sites:
Note, angle for grid-tie is very different than
off-grid. (because you are watching for
optimal energy generation the whole day.
For the mini off-grid installations, current position is
good for winter (until march 30), lay on top during summer.
Batteries for mini-grid
System works for either 12 or 24 volt battery systems
(however, you need different output systems for 24v) For simplicity, I recommend all small systems
stay at 12v.
You can use 2 6v batteries in series to get 12v, but they
must be very very similar.
Checkout of Battery
Battery checkout is the most dangerous step. It is a little safer to do battery checkout
with a smart charger (from 110), but it can be tricky in other ways. (I had fully discharged batteries take days
to recover on a charger, but I think the charge controller would have quickly
worked).
Do not attach a battery directly to an array of
batteries. (Even a good battery could
rapidly charge, generating hydrogen, and explode, spraying sulfuric acid.) Battery testing should be done outside. Batteries should always be on a thermal
insulator (like a piece of wood). Lead-acid
Batteries are not really a fire risk.
(all types of lithium batteries are a fire risk because they have ~10x
energy density).
The Charge controller to battery hookup has clips for this
reason.
#1 measure new battery voltage (should be between 9 and 12
volts, but not necessary).
#2 remove clips from existing batteries and attach to new
battery (battery should be at least 30#s).
#3 measure new battery voltage (do this during the day). Within 10 min battery should be between 9 and
12 volts. If battery is not quickly
moving to 9 volts you may have a problem.
#4 Everything should work right away, but avoid placing heavy
loads, and night use
#5 Every evening and morning check the battery voltage to get
a feel for self-discharge and capacity.
Loads
The charge controller is a 42v 30A device.
That means that if any circuit goes over 42v and/or 30A, at
least that part and likely everything fails.
So voltage open circuit (VOC) of the solar panels should be
less than 42 volts.
Friday, September 11, 2015
More Windows 10
Removing OneDrive from windows 10
http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_files/how-to-uninstall-onedrive-completely-in-windows-10/e735a3b8-09f1-40e2-89c3-b93cf7fe6994?auth=1
Remember to clean up the registry afterwards.
http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_files/how-to-uninstall-onedrive-completely-in-windows-10/e735a3b8-09f1-40e2-89c3-b93cf7fe6994?auth=1
Remember to clean up the registry afterwards.
Sunday, August 16, 2015
Windows 10
I've been updating my computers to windows 10.
Good: generally works. Particularly, on the slowest machine, seemed to work better.
Bad: some driver issues. bluetooth confused (thought it was USB, had to uninstall and reinstall a few time).
Bad: lots of advertising.
to get rid of stupid metro aps:
http://www.howtogeek.com/224798/how-to-uninstall-windows-10s-built-in-apps-and-how-to-reinstall-them
used the following commands
Get-AppxPackage *3dbuilder* | Remove-AppxPackage
Get-AppxPackage *windowscommunicationsapps* | Remove-AppxPackage
Get-AppxPackage *officehub* | Remove-AppxPackage
Get-AppxPackage *skypeapp* | Remove-AppxPackage
Get-AppxPackage *getstarted* | Remove-AppxPackage
Get-AppxPackage *zunemusic* | Remove-AppxPackage
Get-AppxPackage *windowsmaps* | Remove-AppxPackage
Get-AppxPackage *solitairecollection* | Remove-AppxPackage
Get-AppxPackage *bingfinance* | Remove-AppxPackage
Get-AppxPackage *zunevideo* | Remove-AppxPackage
Get-AppxPackage *bingnews* | Remove-AppxPackage
Get-AppxPackage *onenote* | Remove-AppxPackage
Get-AppxPackage *people* | Remove-AppxPackage
Get-AppxPackage *windowsphone* | Remove-AppxPackage
Get-AppxPackage *photos* | Remove-AppxPackage
Get-AppxPackage *windowsstore* | Remove-AppxPackage
Get-AppxPackage *bingsports* | Remove-AppxPackage
Get-AppxPackage *soundrecorder* | Remove-AppxPackage
Get-AppxPackage *bingweather* | Remove-AppxPackage
Get-AppxPackage *xboxapp* | Remove-AppxPackage
Get-AppxPackage *travel* | Remove-AppxPackage
Get-AppxPackage *reading* | Remove-AppxPackage
Get-AppxPackage *camera* | Remove-AppxPackage
Good: generally works. Particularly, on the slowest machine, seemed to work better.
Bad: some driver issues. bluetooth confused (thought it was USB, had to uninstall and reinstall a few time).
Bad: lots of advertising.
to get rid of stupid metro aps:
http://www.howtogeek.com/224798/how-to-uninstall-windows-10s-built-in-apps-and-how-to-reinstall-them
used the following commands
Get-AppxPackage *3dbuilder* | Remove-AppxPackage
Get-AppxPackage *windowscommunicationsapps* | Remove-AppxPackage
Get-AppxPackage *officehub* | Remove-AppxPackage
Get-AppxPackage *skypeapp* | Remove-AppxPackage
Get-AppxPackage *getstarted* | Remove-AppxPackage
Get-AppxPackage *zunemusic* | Remove-AppxPackage
Get-AppxPackage *windowsmaps* | Remove-AppxPackage
Get-AppxPackage *solitairecollection* | Remove-AppxPackage
Get-AppxPackage *bingfinance* | Remove-AppxPackage
Get-AppxPackage *zunevideo* | Remove-AppxPackage
Get-AppxPackage *bingnews* | Remove-AppxPackage
Get-AppxPackage *onenote* | Remove-AppxPackage
Get-AppxPackage *people* | Remove-AppxPackage
Get-AppxPackage *windowsphone* | Remove-AppxPackage
Get-AppxPackage *photos* | Remove-AppxPackage
Get-AppxPackage *windowsstore* | Remove-AppxPackage
Get-AppxPackage *bingsports* | Remove-AppxPackage
Get-AppxPackage *soundrecorder* | Remove-AppxPackage
Get-AppxPackage *bingweather* | Remove-AppxPackage
Get-AppxPackage *xboxapp* | Remove-AppxPackage
Get-AppxPackage *travel* | Remove-AppxPackage
Get-AppxPackage *reading* | Remove-AppxPackage
Get-AppxPackage *camera* | Remove-AppxPackage
Friday, February 20, 2015
Bash script for Cygwin to read in camera images from SD card
#this script does a nice job of reading in DCIM cards
#run with ./get_picts title
#it creates a folder with a date if the name is defaulted, appends drive name, then title.
#!/bin/bash
thisTitle=$*
getlabel() {
$(cygpath --sysdir)/cmd /c dir ${1}:\\ | \
tr \\r \\n | \
sed -n -e '1s/^ Volume in drive . is //p'
}
cd /cygdrive/c/DCIM
cd ~/DCIM
for i in e f g h i j k l m
#
#DIRS=`ls -d /media/matt/*/DCIM`
#echo $DIRS
#for thisTarget in $DIRS
do
thisTarget="/cygdrive/${i}/DCIM"
if [ -d "$thisTarget" ]; then
driveName=`getlabel ${i}`
echo $driveName
thisDate=$(date +%y%m%d)
#echo $thisDate
#echo $thisTitle
thisDate=$thisDate"_"$driveName"_"$thisTitle
echo $thisDate
#read -p "Press [Enter] key to start copy..."
if [ -d "$thisTarget/101ND610" ]; then
mv "$thisTarget/101ND610" "$thisTarget/$thisDate"
fi
if [ -d "$thisTarget/101D3200" ]; then
mv "$thisTarget/101D3200" "$thisTarget/$thisDate"
fi
if [ -d "$thisTarget/100D3200" ]; then
mv "$thisTarget/100D3200" "$thisTarget/$thisDate"
fi
mv -f $thisTarget/1* .
for jj in $(ls -d $thisTarget/* | xargs -n1 basename)
do
for kk in _1 _2 _3 _4 _5 _6 _7 _8
do
if [ -d $jj$kk ]; then
echo $jj$kk
else
mv -f $thisTarget/$jj $jj$kk
break
fi
done
done
rmdir $thisTarget
fi
done
find . -type d -exec rmdir --ignore-fail-on-non-empty -p {} \;
find . -name "DSC*.JPG" -ls -exec exifautotran {} \;
find . -name "IMG*.JPG" -ls -exec exifautotran {} \;
find . -name "DSC*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "DSC*.NEF" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "IMG*.PEF" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "IMG*.PEF" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%f%%-c '-filename<$CreateDate.%e' {} \;
find . -name "IMG*.CR2" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "IMG*.DNG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "IMG*.DNG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%f%%-c '-filename<$CreateDate.%e' {} \;
find . -name "IMG*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "IMG*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%f%%-c '-filename<$CreateDate.%e' {} \;
find . -name "P*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "P*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%f%%-c '-filename<$CreateDate.%e' {} \;
#run with ./get_picts title
#it creates a folder with a date if the name is defaulted, appends drive name, then title.
#!/bin/bash
thisTitle=$*
getlabel() {
$(cygpath --sysdir)/cmd /c dir ${1}:\\ | \
tr \\r \\n | \
sed -n -e '1s/^ Volume in drive . is //p'
}
cd /cygdrive/c/DCIM
cd ~/DCIM
for i in e f g h i j k l m
#
#DIRS=`ls -d /media/matt/*/DCIM`
#echo $DIRS
#for thisTarget in $DIRS
do
thisTarget="/cygdrive/${i}/DCIM"
if [ -d "$thisTarget" ]; then
driveName=`getlabel ${i}`
echo $driveName
thisDate=$(date +%y%m%d)
#echo $thisDate
#echo $thisTitle
thisDate=$thisDate"_"$driveName"_"$thisTitle
echo $thisDate
#read -p "Press [Enter] key to start copy..."
if [ -d "$thisTarget/101ND610" ]; then
mv "$thisTarget/101ND610" "$thisTarget/$thisDate"
fi
if [ -d "$thisTarget/101D3200" ]; then
mv "$thisTarget/101D3200" "$thisTarget/$thisDate"
fi
if [ -d "$thisTarget/100D3200" ]; then
mv "$thisTarget/100D3200" "$thisTarget/$thisDate"
fi
mv -f $thisTarget/1* .
for jj in $(ls -d $thisTarget/* | xargs -n1 basename)
do
for kk in _1 _2 _3 _4 _5 _6 _7 _8
do
if [ -d $jj$kk ]; then
echo $jj$kk
else
mv -f $thisTarget/$jj $jj$kk
break
fi
done
done
rmdir $thisTarget
fi
done
find . -type d -exec rmdir --ignore-fail-on-non-empty -p {} \;
find . -name "DSC*.JPG" -ls -exec exifautotran {} \;
find . -name "IMG*.JPG" -ls -exec exifautotran {} \;
find . -name "DSC*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "DSC*.NEF" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "IMG*.PEF" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "IMG*.PEF" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%f%%-c '-filename<$CreateDate.%e' {} \;
find . -name "IMG*.CR2" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "IMG*.DNG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "IMG*.DNG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%f%%-c '-filename<$CreateDate.%e' {} \;
find . -name "IMG*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "IMG*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%f%%-c '-filename<$CreateDate.%e' {} \;
find . -name "P*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%-c '-filename<$CreateDate-$filenumber.%e' {} \;
find . -name "P*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M.%S%%f%%-c '-filename<$CreateDate.%e' {} \;
Thursday, October 31, 2013
Simple shell script to import photo's from SD card.
cd /cygdrive/c/DCIM
for i in e f g h i j k l m
do
thisTarget="/cygdrive/${i}/DCIM"
if [ -d "$thisTarget" ]; then
thisDate=$(date +%y%m%d)
if [ -d "$thisTarget/100ND610" ]; then
mv "$thisTarget/100ND610" "$thisTarget/$thisDate"
fi
mv -f $thisTarget/1* .
for jj in $(ls -d $thisTarget/* | xargs -n1 basename)
do
for kk in _1 _2 _3 _4
do
if [ -d $jj$kk ]; then
echo $jj$kk
else
mv -f $thisTarget/$jj $jj$kk
break
fi
done
done
rmdir $thisTarget
fi
done
find . -type d -exec rmdir --ignore-fail-on-non-empty -p {} \;
find . -name "DSC*.JPG" -ls -exec exifautotran {} \;
find . -name "IMG*.JPG" -ls -exec exifautotran {} \;
find . -name "DSC*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M%%-c.%%e "-filename<CreateDate" {} \;
find . -name "DSC*.NEF" -ls -exec exiftool -d %Y.%m.%d-%H.%M%%-c.%%e "-filename<CreateDate" {} \;
find . -name "IMG*.PEF" -ls -exec exiftool -d %Y.%m.%d-%H.%M%%-c.%%e "-filename<CreateDate" {} \;
find . -name "IMG*.CR2" -ls -exec exiftool -d %Y.%m.%d-%H.%M%%-c.%%e "-filename<CreateDate" {} \;
find . -name "IMG*.DNG" -ls -exec exiftool -d %Y.%m.%d-%H.%M%%-c.%%e "-filename<CreateDate" {} \;
find . -name "IMG*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M%%-c.%%e "-filename<CreateDate" {} \;
find . -name "P*.JPG" -ls -exec exiftool -d %Y.%m.%d-%H.%M%%-c.%%e "-filename<CreateDate" {} \;
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