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====== Sonar ======
Water proof sonar:
  * [[https://www.google.com/search?client=firefox-b-e&q=AJ-SR04M|Google AJ-SR04M]]
  * [[https://botland.cz/ultrazvukove-snimace-vzdalenosti/15715-ultrazvukovy-snimac-vzdalenosti-me007ys-28-450cm-vodotesny-dfrobot-sen0312-5904422343682.html|Ultrazvukový snímač vzdálenosti ME007YS]]
  * [[https://botland.cz/ultrazvukove-snimace-vzdalenosti/7266-ultrazvukovy-snimac-vzdalenosti-jsn-sr04t-20-450-cm-s-vodotesnou-sondou-5904422310066.html|Ultrazvukový snímač vzdálenosti JSN-SR04T]]
====== Capacitor ======


Wire around pipe:
[[https://www.iotchallengekeysight.com/2019/entries/smart-water/98-0505-104027-low-cost-low-power-water-level-iot-sensor|Low-cost, Low-power Water Level IoT Sensor]]

Two metal plates between water:
[[https://www.analog.com/en/analog-dialogue/articles/liquid-level-sensing-using-cdcs.html|Liquid Level Sensing Using Capacitive-to-Digital Converters]]

About permitivity:
[[https://www.treking.cz/astronomie/permitivita.htm|Permitivita vakua s permitivitou prostředí]]

šroubovice:
[[http://homepages.math.slu.cz/AdamHlavac/Sroubovice.pdf|Příklad s šroubovicí]]
[[http://www.matematech.cz/wp-content/uploads/2018/08/Pracovni_list_sroubovice_verze2.pdf|Výpočet délky šroubovice]]

Capacitor:
[[https://fyzikalnipokusy.cz/1896/deskovy-kondenzator|Deskový kondenzátor]]

====== LoRa======
[[https://botland.cz/hledat?s=E5|botland E5]]
== STM32WL ==
  * [[https://www.tme.eu/cz/details/mamwle01/moduly-rf/movex/mamwle-01/|MAMWLE-01MoveX(TME)]]
  * [[https://wiki.seeedstudio.com/LoRa-E5_STM32WLE5JC_Module/|LoRa-E5_STM32WLE5JC_Module]]
  * [[https://www.tme.eu/cz/details/seeed-317990687/moduly-rf/seeed-studio/lora-e5-lorawan-module/|lora-e5-lorawan-module(TME)]]

== LoRa SX1278 ==
  * [[https://how2electronics.com/interfacing-lora-sx1278-stm32-sender-receiver/|Interfacing LoRa SX1278 with STM32 – Sender & Receiver]]
  * [[https://github.com/SMotlaq/LoRa|github LoRa STM32]]


====== 433MHz RF Modules ======
Module from Martin:
[[https://www.tme.eu/cz/details/rtf-data-saw/moduly-rf/aurel/|RTF-DATA-SAWAUREL]]