Maybe you're oxidizing the soil around the sensor? In any case, oxidization (esp...

exelius on June 27, 2017 | parent | context | favorite | on: Show HN: GreenPiThumb – A Raspberry Pi Gardening B...

Maybe you're oxidizing the soil around the sensor? In any case, oxidization (especially with gold-plated sensors) is a concern. I was unable to get these simple resistive sensors to work consistently long-term.