Edit Project: ISpindel

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== iSpindel == iSpindel DIY continuous hydrometer, for measuring the realitive gravity / density of wort. Meant as an educational project for [https://kwbg.nl KWBG]. We created footprint for the various parts on the PCB. These can be found in the /libs dir in the repo. Furthermore we replaced the reset switch with a reed switch so you can use a magnet to reset the iSpindel without opening the container. See also the [[ISpindel/dutchdocsfornoobs| documentation page in Dutch for easy setting up cloud data services with iSpindel here]] See also [https://github.com/techinc/ispindel_kicad TechInc iSpindel_KiCAD page on GitHub] (last commit aug 2022) See als [https://github.com/bathoorn/ispindel_kicad Einnors iSpindel_kiCAD page on GitHub] (last commit may 29, 2022) == Why Bat43??? == It seems to me that the selection of the diode to be a schottky is a critical one here! According to the datasheet, the min. Input Low Voltage must be < 0.25×VIO while the Output Low Voltage is up to 0.1×VIO. Therefore, this leaves 500mV where the BAT43 will drop around 300mV or more. So a regular silicium diode will fail in this setup! Using a BAT43 or better is a requirement so to speak. found here [[https://github.com/universam1/iSpindel/issues/59 iSpindel/issue/59]] Previous work: * [https://www.ispindel.de/ iSpindel - DIY electronic Hydrometer] * [https://www.opensourcedistilling.com/ispindel/ iSpindel by TheJeffrey] Alternative firmware: * [https://github.com/mp-se/gravitymon Gravitymon] Look also here: [https://code.techinc.nl/Einnor/ti_spindel Code.techinc.nl/Einnor/ti_spindel] [[File:Top_ispindel.png]] [[File:Bottom_ispindel.png]] == First test results === Woohoo data arrives in ubidots [[File:Ubidots.jpg]] * Did the first 90 degrees calibration * Did the 25 degrees test in normal water (after some balancing came out at 24,8 degrees) [[File:Ubidots-4000datapoints.png]] * during calibration i had the update frequency set to every 20 seconds, make sure you change that to something like every 5 to 15 minutes * Ubidots only allows 4000 datapoints per day after that measurements will no longer be saved until the next day * uploading every 20 seconds only gives you datapoints in your graph for the first 4 hours every day * the battery will also not last very long when you do this * all in all a good test. Don't do this if you want the ispindel to take measurements for the entire brewing process Helpful links for calibration * [https://chasethecraft.com/calculators sugar wash calculator] * [https://www.brewersfriend.com/dilution-and-boiloff-gravity-calculator/ gravity delution calculator] * [https://www.ispindel.de/tools/calibration/calibration.htm iSpindel online calibration tool] == Handy Formulas == Following formulas can be used to convert Gravity values from degrees P to SG and vice versa. Plan is to use this in the firmware to decide on what value to send based on a config variable same as is possible for temperature. * degrees P = 259-(259/SG) * SG = 259/(259-degrees P) TODO-List: * <s>Cleaned PCB repo (first version: Einnor)</s> * Pannelization test (Einnor) * <s>Reed-switch test/rework (Einnor)</s> * <s>Footprint Battery Holder with sliding pads (Einnor)</s> * <s>Footprint D1-Mini 8-pin version (justa)</s> Done by Einnor * <s>Petling bottles order (justa)</s> Done, 20220608. 10 pieces * Online-service (ubidots?) uitzoeken/selecteren (sikkepitje) * Order more parts (Einnor + Justa) * <s>Test whole setup on a breadboard</s> YOLO ordered pcb and did first test on that * <s>Add gravity scale to firmware (einnor)</s> not needed polynomials are for SG * possibly fork firmware repo or create a pull request (einnor) * <s>add resistor types to the silk layer</s> * <s>add battery + and - to the silk layer</s> * <s>setup a mailing list! 😁 (Justa)</s> Done: beernerds@lists.techinc.nl == Ordered stuff == * 30 pcb's with minor changes (ronnie) === Arrived === * 10 Petling's (justa) * 2 GY521 Gyro's (justa) * 1 TP4051 (justa) * 1 Wemos D1-Mini (justa) * 2 Battery-holders (justa) * 5 pcb's (einnor) * 20 BAT43's (justa) * 2 SMD-reed-switches (justa) === In progress === * order more parts after testing == calibration data for ispindel_arnd1 == [[36.5,1000.8750960475685],[39.65,1010.8838470080442],[48.85,1018.8908477764247],[57.77,1025.8969734487578],[63.8,1032.9030991210907],[68.04,1042.9118500815664],[73.52,1056.9241014262323],[75.65,1066.932852386708]] Load @ [https://www.ispindel.de/tools/calibration/calibration.htm iSpindel online calibration tool] == calibration data for ispindel_bat43 == corrected from 24C degrees water temperature to 20C degrees (correction is needed because SG values are related to the density of water at 20C) * 24C [[25.2,1000],[27.17,1010],[32.71,1018],[39.82,1025],[45.85,1032],[51.5,1042],[61.1,1056],[65.25,1066]] * 20C [[25.2,1000.8750960475685],[27.17,1010.8838470080442],[32.71,1018.8908477764247],[39.82,1025.8969734487578],[45.85,1032.9030991210907],[51.5,1042.9118500815664],[61.1,1056.9241014262323],[65.25,1066.932852386708]] this leads to the following polynomials Corrected for 24C * Degree 1: 966.9279707169078 + 1.4939612781443774 *tilt * Degree 2: 973.729794397618 + 1.157456640501496 *tilt + 0.0037492943416183606 *tilt*tilt * Degree 3: 882.113582283499 + 8.017945029109477 *tilt-0.15705832812978124 *tilt*tilt + 0.0011897660268308918 *tilt*tilt*tilt == Iterations == * [[ISpindel/iteration1|Version 1, Purple PCB, Techinc Logo]]

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