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The LM2596 series operates at a switching frequency of 150 kHz
You can learn how to get the schematic diagram through this document: https://heltec-automation-docs
which you will want to use as a pullup from the data pin to VCC
These are extremely economical and can be replaced in no time
Pin 2 of LM393 is connected to Preset (10KΩ Pot) while pin 3 is connected to Moisture sensor pin
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