Well

batterycharge_stationdata/TODO

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+# replace max6675 with microcontroller, ala attiny 5/6 pin sot or something to save money
+
+
+

batterycharge_stationdata/bom/.~lock.BOM_Batterystation.ods#

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+,layoutdev,layoutmach,25.04.2019 01:25,file:///home/layoutdev/.config/libreoffice/4;

batterycharge_stationdata/bom/.~lock.BOM_LTCharger.ods#

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+,layoutdev,layoutmach,25.04.2019 01:23,file:///home/layoutdev/.config/libreoffice/4;

batterycharge_stationdata/bom/BOM_Batterystation.csv

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+Quantity,Manufacturer Part #,Digi-key Part #,Notes
+1,A000005,1050-1001-ND ,arduino nano
+1,MAX6675ISA+,MAX6675ISA+-ND ,This is $10 in tube. Need to find a cheaper part. Or buy on ebay or use a micro instead. TODO
+1,240-080,1286-1099-ND ,thermocouple
+1,LM317DCYR,296-12602-1-ND ,LM317. Going to need to upgrade this to higher amperage
+2,CRG0805F3K0 ,A126368CT-ND ,3K resistor. Change to higher number (10 or so) after adding
+1,INA169NA/3K,296-26063-1-ND ,Current monitor. About 2.50
+2,RNCP0805FTD1R00,RNCP0805FTD1R00CT-ND ,1 ohm resistor 1% 0805
+2,RNCP0805FTD5K11,RNCP0805FTD5K11CT-ND,5k resistor for ST charger divider
+1,STC4054GR,497-5809-1-ND,st lithium battery charger
+2,885012107013,732-7623-1-ND ,st capacitor 4.7 0805

batterycharge_stationdata/bom/BOM_LTCharger.csv

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+Quantity,Manufacturer Part #,Digi-key Part #,Notes
+2,1255AY-150M=P3 ,490-10802-1-ND ,inductors
+1,LT1512CN8#PBF ,LT1512CN8#PBF-ND,universal charger
+1,PTL45-15O0-104B1 ,PTL45-15O0-104B1-ND ,Linear slide pot
+1,PCM13SMTR ,401-2017-1-ND ,Switch (sp3t)
+1,PCM12SMTR ,401-2016-1-ND ,switch (sp2t)
+1,F931E226MCC ,478-8314-1-ND ,22uf tantalum cap (expensive. Try to make board without tantalum)
+2,73L3R20J,73L3R20JCT-ND ,0.2ohm resistor
+2,RC0805JR-0724RL ,311-24ARCT-ND ,24 ohm resistor
+2,RC0805FR-07536RL ,311-536CRCT-ND ,536 ohm resistor
+2,CRG0805F2K0 ,A126358CT-ND ,2k resistor
+2,RC0805FR-0712K4L ,311-12.4KCRCT-ND ,12.4k resistor
+2,RC0805FR-0728K7L ,311-28.7KCRCT-ND ,28.7k resistor
+2,RC0805FR-0754K9L ,311-54.9KCRCT-ND ,54.9k resistor
+2,08055C104KAT2A,478-1395-1-ND ,0.1uf 
+2,C0805C224K5RACAUTO,399-6949-1-ND ,0.22uf
+3,CL21A225KAFNNNE,1276-1763-1-ND ,2.2uf
+2,"PMEG4010BEA,135",1727-1202-1-ND ,schottkey diode

batterycharge_stationdata/docs/4.aux

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 \@writefile{toc}{\contentsline {subsection}{\numberline {2.2}Current monitor}{5}}
 \@writefile{toc}{\contentsline {subsection}{\numberline {2.3}PCB Revision - Modular Parts}{5}}
 \@writefile{lof}{\contentsline {figure}{\numberline {1}{\ignorespaces Cut out with pliers and reuse parts.\relax }}{6}}
+\@writefile{toc}{\contentsline {subsubsection}{\numberline {2.3.1}Ripped off by temperature sensors}{6}}
+\@writefile{lof}{\contentsline {figure}{\numberline {2}{\ignorespaces technoblogy has an article on using a micro with an external thermocouple\relax }}{7}}
+\@writefile{toc}{\contentsline {section}{\numberline {3}Bom Notes}{7}}
+\@writefile{toc}{\contentsline {subsubsection}{\numberline {3.0.2}SOD323 (diode) is equal to 0805}{8}}

batterycharge_stationdata/docs/4.log

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batterycharge_stationdata/docs/4.tex

@@ -190,6 +190,57 @@ I decided to route out some of the pcb, so I can possibly reuse the temperature
 \includegraphics{../pics/modular_reusable.jpg}
 \captionof{figure}{Cut out with pliers and reuse parts.}
 
+\subsubsection{Ripped off by temperature sensors}
+The community around Arduino advertises the LM35, advertises the MAX6675. The latter is \$10 in one off quantity (\$5 from ebay), the former isn't cheap either, at \$2.00 about. Though the LM35 has a much more limited range. The LM35 is great as it's extremely simple to use (power and read voltage which converts directly to temperature).
+
+I'll have to find an alternative for the MAX6675. At \$10 it's just stupid. A micro can do temperature as well. Maybe \$5 would be acceptable, but \$10 is not. How big are your pockets?
+
+\vspace{0.4in}
+
+\includegraphics[scale=0.3]{../pics/tinythermocouple.jpg}
+\captionof{figure}{technoblogy has an article on using a micro with an external thermocouple}
+
+Cheapest thermocouple on Digikey, is a digilent (they just import) thermocouple at \$10. Next is a DFRobot (chinese adafruit) at \$30 with a module included. Thermocouples are not cheap! Onto ebay.\footnote{Thermocouples: I forgot how they work today. I've read of them before but haven't used them much (have seen them in toasters. Now that I know they are worth \$5-10 I'm going to start retrieving them from broken toasters). When two dissimilar metals are put together, and then the metals are heated, you can get a voltage across them. This voltage can be read with an ADC. This phenomenon has a name, but the name is not important. Names just add another thing you need to remember. Bad idea. (OK, I remembered it, now I can fool myself into feeling intelligent - seebeck effect. Now let me go count my hertz, and volts, and teslas...) Wikipedia calls it the thermoelectric effect.}
+
+After some research I decided to go with the Digilent probe. The cheapest used probe on ebay is \$10. I don't want the new ones from US, which is only \$5 cheaper.
+
+\section{Bom Notes}
+I should try to get rid of some expensive items where possible.
+
+\vspace{0.2in}
+
+tantalum is \$1. Try a ceramic.
+
+MAX6675 is \$10.
+
+Slide pot is just for fun. That can be removed.
+
+
+
+\vspace{0.2in}
+
+
+On the subject of boms, I have made two. The LT portion is complex, and requires its own bom. The rest of the items are on a different bom. I keep some things in stock so a few items have been omitted.
+
+\subsubsection{SOD323 (diode) is equal to 0805}
+Looks like the SOD323, diode / SC-73 package is near the 0805 package in size. SOD323 is slightly smaller, but not by much. They are probably interchangeable in practice.
+
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 \end{document}

batterycharge_stationdata/docs/4.toc

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 \contentsline {subsection}{\numberline {2.1}Part Selection Summary}{3}
 \contentsline {subsection}{\numberline {2.2}Current monitor}{5}
 \contentsline {subsection}{\numberline {2.3}PCB Revision - Modular Parts}{5}
+\contentsline {subsubsection}{\numberline {2.3.1}Ripped off by temperature sensors}{6}
+\contentsline {section}{\numberline {3}Bom Notes}{7}
+\contentsline {subsubsection}{\numberline {3.0.2}SOD323 (diode) is equal to 0805}{8}