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Yes, I did remove LEDs and did not connect to arduino via raw / voltage regulator (as far as I know using VCC pin of arduino bypass voltage reg.). I will look into Analog input suggestion bypassing YL-38. Thank you for advice.
You are right. Another solution would be to add transistor to YL-38 moisture module and some arduino pinout. Then switch on circuit only when micro-controller is awake thus almost eliminating electrolysis process on feet. (I am planning to make updated scheme). Then it should be possible to last for long time also with this low quality feet/fork sensor part. Adding transistor for powering up all external modules would also save battery a lot.
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