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    • OldSurferDude

      Soil Moisture Sensor Powered by solar charged battery
      My Project • battery home assistant low power eeprom solar calibration • • OldSurferDude  

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      CrankyCoder

      @OldSurferDude I use this. https://www.homedepot.com/p/Orbit-Solenoid-for-Battery-Operated-Timer-57861/203151515 Instead of having to hold the valve open, i can just pulse it. I use a simple motor controller to pulse it and when i need to close it, pulse it in "reverse". That way I could use a battery and if it only opens once or twice a day it's only a half a second or so of draw off the battery.
    • openhardware.io

      💬 The Harvester: ultimate power supply for the Raybeacon DK
      OpenHardware.io • power supply usb solar charger raytrails mppt teg • • openhardware.io  

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      NeverDie

      @NeverDie said in The Harvester: ultimate power supply for the Raybeacon DK: Edit: This guy found another couple of possibilities as to what the E50D chip might be: https://www.electroschematics.com/pfm-module-circuit-surgery/ I have the same board as this guy. I removed the LED and resistor because they are on the input side, so they are almost useless anyway. For a board such as this, with a promised 0.9v startup voltage on the input side and a promised 5v on the output side, they really should have been attached to the output, not the input, to show roughly when it is that the board is producing useable output. At a 20mv "keep alive" input voltage, the input measures 0.5ma using a uCurrent Gold. That means the keep alive energy is 10 microWatts. Offhand, for the application we've been discussing on this thread, I suspect that number is too high to be practically useful, because at only 20mv input we'd be collecting far less than 0.5ma current from a tiny panel. At least now we know.
    • openhardware.io

      💬 Supercap solar charger
      OpenHardware.io • solar charger supercap harvesting harveter harvest charge super capacitor ideal diode • • openhardware.io  

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      NeverDie

      @Mishka Ah yes, that is true. In this case though I went out of my way to keep the PCB dimensions as small as possible so that someone could have it made at OSH-PARK for super cheap--just $0.30 per board. If I ever figure out how to post a complete set of KiCAD files, then I guess maybe then everyone can modify it to suit their circumstances. Until then, it will be hard to have one's cake and eat it too.
    • openhardware.io

      💬 Tiny Solar Charger for 2.7v Mote Supercap
      OpenHardware.io • solar charger supercap mote ldo • • openhardware.io  

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      NeverDie

      If you wish, you may substitute S-1313 ( http://datasheet.sii-ic.com/en/voltage_regulator/S1313_E.pdf) for the MAX8887EZK27 LDO
    • openhardware.io

      💬 Solar Energy Harvester
      OpenHardware.io • converter step-up boost boost converter charger solar mppt booster energy harvesting ltc3105 mppc boosting charging • • openhardware.io  

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      Mar

      Right you are. Live and learn (even at 81), and I even learned a new word -'vias.' Thanks.