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Capacitive soil moisture sensor

References

Capacitive sensing

1. Capacitive Soil Moisture Sensor SKU:SEN0193
2. A cheap capacitive soil moisture sensor
3. Capacitive Soil Moisture Measuring (with I2C)
4. How do you measure soil moisture using a capacitive sensor?
5. Chirp - capacitive soil moisture sensor based on ATTINY44
   • I2C moisture sensor
6. Lucky Resister
   • How to design a cheap plant watering sensor (Part 1)
   • How to design a cheap plant watering sensor (Part 2)
   • How to design a cheap plant watering sensor (Part 3)
   • How to design a cheap plant watering sensor (Part 4)
   • How to design a cheap plant watering sensor (Part 5)
   • Plant Watering Sensor Foot Parts from Eurocircuits
   • No success with first long term measurement
   • Plant Watering Sensor - Long Term Logging