Initial Commit

Author: greiman

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto
+
+# Custom for Visual Studio
+*.cs     diff=csharp
+*.sln    merge=union
+*.csproj merge=union
+*.vbproj merge=union
+*.fsproj merge=union
+*.dbproj merge=union
+
+# Standard to msysgit
+*.doc	 diff=astextplain
+*.DOC	 diff=astextplain
+*.docx diff=astextplain
+*.DOCX diff=astextplain
+*.dot  diff=astextplain
+*.DOT  diff=astextplain
+*.pdf  diff=astextplain
+*.PDF	 diff=astextplain
+*.rtf	 diff=astextplain
+*.RTF	 diff=astextplain

.gitignore

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+#################
+## Eclipse
+#################
+
+*.pydevproject
+.project
+.metadata
+bin/
+tmp/
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.classpath
+.settings/
+.loadpath
+
+# External tool builders
+.externalToolBuilders/
+
+# Locally stored "Eclipse launch configurations"
+*.launch
+
+# CDT-specific
+.cproject
+
+# PDT-specific
+.buildpath
+
+
+#################
+## Visual Studio
+#################
+
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+## files generated by popular Visual Studio add-ons.
+
+# User-specific files
+*.suo
+*.user
+*.sln.docstates
+
+# Build results
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+[Dd]ebug/
+[Rr]elease/
+x64/
+build/
+[Bb]in/
+[Oo]bj/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+*_i.c
+*_p.c
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
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+.builds
+*.pidb
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+# Visual C++ cache files
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+# Visual Studio profiler
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+# Guidance Automation Toolkit
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+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
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+# TeamCity is a build add-in
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+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# NCrunch
+*.ncrunch*
+.*crunch*.local.xml
+
+# Installshield output folder
+[Ee]xpress/
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+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.Publish.xml
+*.pubxml
+
+# NuGet Packages Directory
+## TODO: If you have NuGet Package Restore enabled, uncomment the next line
+#packages/
+
+# Windows Azure Build Output
+csx
+*.build.csdef
+
+# Windows Store app package directory
+AppPackages/
+
+# Others
+sql/
+*.Cache
+ClientBin/
+[Ss]tyle[Cc]op.*
+~$*
+*~
+*.dbmdl
+*.[Pp]ublish.xml
+*.pfx
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+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file to a newer
+# Visual Studio version. Backup files are not needed, because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+App_Data/*.mdf
+App_Data/*.ldf
+
+#############
+## Windows detritus
+#############
+
+# Windows image file caches
+Thumbs.db
+ehthumbs.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Mac crap
+.DS_Store
+
+
+#############
+## Python
+#############
+
+*.py[co]
+
+# Packages
+*.egg
+*.egg-info
+dist/
+build/
+eggs/
+parts/
+var/
+sdist/
+develop-eggs/
+.installed.cfg
+
+# Installer logs
+pip-log.txt
+
+# Unit test / coverage reports
+.coverage
+.tox
+
+#Translations
+*.mo
+
+#Mr Developer
+.mr.developer.cfg

AnalogBinLoggerExtras/ADC_ENOB.PNG

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+Static Tests of the Arduino Internal ADC.
+
+Several people have asked about the DC accuracy of the Arduino ADC when used in my data logging applications at slow sample rates.
+
+Here are my results of some "hobby level" measurements of the Arduino ADC.
+
+One question is how important is the ADC clock rate.  I did measurents for an ADC clock rate of 125 kHz to 2MHz.
+
+Another question is how much does Noise Reduction Mode help.  I did a series of measurements using this mode.
+
+Noise Reduction Mode only reduced the mean absolute error slightly.
+
+I do calibration to remove Offset Error and Gain Error.  Calibration is very important for good accuracy.
+
+These tests depend on the Arduino voltage regulator providing a stable voltage during the tests.  The Arduino ADC reference voltage is Vcc for these tests.  This may not be realistic for practical applications
+
+Integral Non-linearity (INL) is the main remaining source of error.
+
+Here are my results for static (DC) tests of the internal ADC for three UNOs.
+
+The Arduinos are powered by a high quality nine volt power supply.
+
+These tests measure a DC level so do not include problems due to time jitter, S/H time, and other dynamic errors.
+There are several studies of the dynamic behavior of the Arduino ADC that determine ENOB (Effective Number Of Bits).
+
+I used a shield with a 12-bit MCP4921 DAC to generate voltage levels. This ADC has an output buffer so it provides a very low impedance source.
+
+I measured the voltage of the DAC with a calibrated 18-bit MCP3422 ADC on the shield.
+
+I used DAC levels from 20 to 4075 to avoid zero offset errors at low voltages and DAC buffer problems at high voltages.
+
+Each series of measurements has 4056 data points.
+
+This is a voltage range of about 0.023 to 4.972 volts.
+
+I calibrated the Arduino ADC for each series of measurements with a linear fit of the form.
+
+v = a + b*adcValue
+
+Errors are the difference between the value measured with the 18-bit ADC and the calibrated value measured with the AVR ADC.
+
+I also show the results for no calibration, the NoCal column, using the datasheet formula.
+
+Vin = Vref*adcValue/1024
+
+
+The rows in the tables tables are.
+
+Min - minimum error in millivolts
+
+Max - maximum error in millivolts
+
+MAE - mean absolute error in millivolts
+
+
+The columns in the tables are:
+
+Ideal - results for a perfect 10-bit ADC for comparison.
+
+NoCal - datasheet formula (5/1024)*adcValue with Noise Reduction Mode.
+
+NR128 - Noise Reduction mode with Prescaler of 128 (ADC clock of 125 kHz).
+
+PS128 - analogRead with Prescaler of 128 (ADC clock of 125 kHz).
+
+PS64 - analogRead with Prescaler of 64 (ADC clock of 250 kHz).
+
+PS32 - analogRead with Prescaler of 32 (ADC clock of 500 kHz).
+
+PS16 - analogRead with Prescaler of 16 (ADC clock of 1 MHz).
+
+PS8 - analogRead with Prescaler of 8 (ADC clock of 2 MHz).
+
+
+Results for three UNO Arduinos
+
+     First Arduino - Error Millivolts
+      
+     Ideal NoCal NR128 PS128  PS64  PS32  PS16    PS8
+Min  -2.44 -2.43 -3.72 -4.01 -3.88 -4.53 -6.57 -27.18
+Max   2.44 11.69  3.74  4.24  4.15  5.17  8.69  23.21
+MAE   1.22  5.02  1.33  1.38  1.37  1.44  1.96   4.11
+
+     Second Arduino - Error Millivolts
+
+     Ideal NoCal NR128 PS128  PS64  PS32  PS16    PS8
+Min  -2.44 -9.24 -4.87 -4.86 -5.05 -5.34 -6.52 -24.04
+Max   2.44 11.62  3.95  4.64  4.69  5.71  8.41  21.29
+MAE   1.22  5.33  1.41  1.43  1.44  1.53  2.02   4.05
+
+     Third Arduino - Error Millivolts
+
+     Ideal NoCal NR128 PS128  PS64  PS32  PS16    PS8
+Min  -2.44 -7.88 -4.12 -4.40 -4.32 -4.41 -6.97 -26.93
+Max   2.44 12.53  3.80  4.04  4.18  5.27  8.84  24.59
+MAE   1.22  4.85  1.29  1.33  1.34  1.42  1.91   4.10
+
+

AnalogBinLoggerExtras/ADCdocs/ATmegaADCAccuracy.pdf

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+Maximum Sample Rate Table
+
+          ADC clock kHz 
+       125   250   500  1000
+pins        
+1     7692 14286 25000 40000
+2     3810  6667 11111 16667
+3     2572  4790  8421 13559
+4     1942  3636  6452 10526
+5     1559  2930  5229  8602
+6     1303  2454  4396  7273
+7     1119  2111  3791  6299
+8      980  1852  3333  5556
+9      872  1649  2974  4969
+10     786  1487  2685  4494
+11     715  1354  2446  4103
+12     656  1242  2247  3774
+13     606  1148  2078  3493
+14     563  1067  1932  3252
+15     525   996  1806  3042
+16     493   935  1695  2857