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Capacitive Soil Moisture Sensor

Basic analog capacitive moisture sensor made from three transistors, two diodes, and a handful of passives!

customelectronicsCustomElectronics
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  • Components 11
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  • customelectronicsCustomElectronics

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ongoing project
Plants low power analog capacitive

This project was created on 06/11/2023 and last updated 2 years ago.

Description

The sensor is intended to be used in houseplants to remind people like me (who forget their own name sometimes) when their plants need to be watered. It can be "calibrated" for different levels of desired soil moisture by adjusting the depth that the sensor is inserted into the soil.

Details

Files

Three Transistor Capacitive Moisture Sensor_2023-03-11.zip

Gerber files for PCB

x-zip-compressed - 19.05 kB - 06/11/2023 at 01:36

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Components

  • 3 × 2N7002 (SOT23) Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs
  • 1 × 1N4148 (SOD123) Discrete Semiconductors / Diodes and Rectifiers
  • 1 × 680pF Ceramic Capacitor (0603) Surface Mount Capacitor
  • 1 × 80pF-270pF Ceramic Capacitor (0603) Tuning Surface Mount Capacitor (should be higher value if you want to trigger earlier on)
  • 2 × 2 Megohm Resistor (0603) Surface mount resistors

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