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en:soilhumidity

Modul for measuring soil humidity

This sensor can be found on ebay for few dolars. Princip of measuring is similar with conductivity measuring. Potential among two electrodes is being measured. But in this case the electrodes are stuck in the ground. This modul measure with DC so the polarization effect occurs. It do not affect the measured value as much but it case degradation of electrodes. Modul has two outputs:

  • Digital (logical one, if soil is dry and zero if it is wet)(modul works like comparator)
  • Analog (outputs the pontential on electrodes)

Sensitivity is set by trimr on modul. Electrodes are nickled for better durability. Inner circuit schema of modul is here.

en/soilhumidity.txt · Last modified: 2018/01/29 10:12 (external edit)