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Module : Soil Moisture Sensor

With this module you can read the humidity of the soil. For that we use a couple YL-38/YL-69.

Corrosion / oxidation issue solution

If you use a soil moisture sensor before, if the sensor is powered for a long time, the probe is going to be oxided.

So to avoid corrosion / oxidation we will power up the sensor only when reading, using a NPN Transistor (BC547) as switch.

Images

Module alone

Module

Module connected to all elements

Module connected

Input

  • 1 * 2 Pin for soil probe (YL-69)

Output

  • 1 * 4 Pin ( (Vin / GND / Reading Pin / Power On)

Components

  • 1 hygrometer detection YL-69/YL-38 + (1euro)

  • 1 transistor NPN BC547C (0.5 euro)

  • 1 1 KOhm resistor ( 0.1 euro )

  • some bakelite plate and thin wires (1 euro)

Estimated cost around 2.60 euros

Schema

Power module schema

Required libraries

YL-38/YL-69 Sensor Arduino lib

Execute install.sh

Or :

git clone [email protected]:jonson/arduino-moisture-sensor.git
mv arduino-moisture-senso/libraries/ ~/Arduino/libraries

Tests

Use the code Reading moisture to test the module. This code will just continuously ask the module the value of humidity of the soil.

Issues

Don't use PIN D4 (GPIO 2) for the reading Pin. There is an issue with this Pin if your ESP8266 goes to deepsleep, it remains the pin High ... I use the GPIO 12 (D6) with no issue in deep sleep (The state remains low)