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Wednesday, June 29, 2016

Soil moisture/humidity control system

   Helpfull for home is a soil moisture control system, who can made easy with a Arduino development board.
   For tests I use a Arduino Mega board, alpahanumerical 1602 LCD with i2c interface, soil moisture module, but for real use must use relay module for control a wattering pump.
   I use sketch named lcd1602_i2c_soilhumidity_ver1.ino who can find at my Github channel.
   My soil moisture sensor is not permanent powered with 5V because in timp probe sensor will be distroyed by electrocorrosion effects, so, I powered the sensor just few seconds at 5 seconds when pump is on for avoid flooding and at 5 minutes (in test I use 20 seconds) when soil is wet.
   I made a few years ago some tests with CMOS 4093 gates (see original article from when I use this schematic whit permanent power of soil probe:
and after 3 months my stainess steel probe was corroded:
   So, I put a threshold value at 25% and I have 2 cases:
- when soil is wet, pump is off, measurements are made at long periods:
- when soil is dry, pump is on, measurement are made at 5 seconds for avoid floods:
   You can see these cases in a movie named soil moisture control system using Arduino

1 comment:

  1. Eagle Touch Technologies was established in 2007. At the beginning, we worked as a Touch screen manufacturer with resistive 4/5 wire and projected Capacitive and LCD distributor for Japanese Brand Mitsubishi and Sharp. From year 2011, we started our embedded products line. Focus on Embedded X86 and ArM platform hardware design and manufacturer.