Home - p-v-o-s/riffle-ito GitHub Wiki

Notes on various topics ...

temperature

http://www.johncon.com/john/ds18s20/ - digital time constant experiment http://www.adafruit.com/datasheets/DS18B20.pdf - digital data sheet http://www.digikey.com/Web%20Export/Supplier%20Content/USSensor_615/PDF/USsensor_Thermal_Time_Constant.pdf?redirected=1 - about a thermal time constant https://www.adafruit.com/products/165 - TMP36 analog temperature sensor

conductivity

http://www.waterontheweb.org/under/waterquality/conductivity.html

http://en.wikipedia.org/wiki/Four-terminal_sensing

http://www.allaboutcircuits.com/vol_1/chpt_8/9.html

http://www.afrotechmods.com/videos/4_wire_kelvin_resistance_measurement.htm

measure current in circuit w/ an arduino and a shunt resistor: http://www.vwlowen.co.uk/arduino/current/current.htm

monitoring current with a current shunt amplifier: http://www.zipfelmaus.com/blog/measuring-current-current-shunt-monitor/

current sensor http://openenergymonitor.org/emon/buildingblocks/dc-shunt

http://forum.arduino.cc/index.php?topic=81605.0

eevblog -- ucurrent sense: http://www.eevblog.com/2010/04/08/eevblog-72-%E2%80%93-let%E2%80%99s-design-a-product/

temp calibration of conductivity

555 Calibration

conductivity <--> TDS: http://www.eutechinst.com/techtips/tech-tips25.htm

alpha coefficient for conductivity

http://www.coleparmer.com/TechLibraryArticle/78

estimates for alpha for different solution: http://www.aslo.org/lo/toc/vol_7/issue_3/0330.pdf

building

  • formatting sd card properly for riffle: sudo mkfs.vfat -F 16 /dev/sdb1

analyzing data

conversion between RTC's 'unix time' and excel time / date format:

=A1/60/60/24+"1-Jan-1970"

where 'A1' is the RTC unixtime value

parts

uSD card from adafruit, avail on digikey: http://www.digikey.com/product-detail/en/101-00660-68-6/101-00660-68-6-1-ND/2187099

right-angle 7-pin female header: http://www.digikey.com/product-detail/en/PPTC071LGBN-RC/S5443-ND/775901

circuits

ben's 'RC' conductivity circuit: https://github.com/bgamari/riffle/blob/fab/remote-board/schematics.pdf

lower power version of 555 timer

http://www.ti.com/lit/ds/symlink/tlc551.pdf

wiring code for conductivity + temp on riffleCT-REVA board

https://gist.github.com/dwblair/238afa8bd1ed3954a4ca

RTC lib

https://github.com/mizraith/RTClib

Good guide to setting up a photoresistor for water measurements

https://learn.adafruit.com/photocells/using-a-photocell

great overall resource

http://edwardmallon.wordpress.com/

good material for sealing enclosure

http://www.amazon.com/J-B-Weld-8277-WaterWeld-Underwater/dp/B000BRQ0TW/ref=sr_1_1?ie=UTF8&qid=1407107791&sr=8-1&keywords=jb+weld+water

formatting equations and in-line code on publiclab.org and github.com

http://rawgit.com/walkerjeffd/riffle-ito-apps/master/analyses/20140725_cambridge/index.html#detailed-conductivity-analysis

code and source for ms5803 pressure sensor

http://edwardmallon.wordpress.com/2014/03/27/adding-a-ms5803-02-high-resolution-pressure-sensor/comment-page-1/#comment-149

ms5703 pressure sensor

http://edwardmallon.wordpress.com/2014/03/27/adding-a-ms5803-02-high-resolution-pressure-sensor/comment-page-1/#comment-149

salinity in agriculture

http://www.fao.org/docrep/t0667e/t0667e05.htm

surface mount version of MCP3008 (adafruit ADC), for fastie alaskan application

http://www.digikey.com/product-detail/en/MCP3004-I%2FSL/MCP3004-I%2FSL-ND/319418?WT.srch=1&WT.medium=cpc&WT.mc_id=IQ66882670-VQ2-g-VQ6-45013741995-VQ15-1t1-VQ16-c

using a potentiostat to analyze heavy metals

http://publiclab.org/wiki/detection-of-metals-in-water-with-the-wheestat

enclosures

relevant parts list from rui's opensprinkler

https://docs.google.com/spreadsheet/pub?key=0AitpZitJ432wdEc4VGNRYmdfclBZWU5Zbm9nWk9pR1E&gid=5&output=html