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Soil Moisture Sensor | NexaLearn IoT Lab | NexaLearn

Smart Agriculture20 دقيقة

Soil Moisture Sensor

Measuring soil moisture to know when your plant needs water.

Lesson Content

The traditional soil sensor works by measuring resistance between two prongs inserted into soil. Water conducts electricity (thanks to dissolved salts), so the wetter the soil, the lower the resistance and the higher the voltage returned to the analog pin. Note: cheap sensors corrode quickly due to continuous electrolysis.

Components Needed

Arduino UnoSoil Moisture Sensor Module

Wiring Notes

Connect the module's analog pin (A0) to A0 on Arduino. VCC to 5V.

Code Example

void setup() {
  Serial.begin(9600);
}
void loop() {
  int moisture = analogRead(A0);
  Serial.println(moisture);
  // في بعض الحساسات، التربة الجافة تقرأ قيمة عالية (1023)
  if(moisture > 800) {
    Serial.println("التربة جافة جداً!");
  }
  delay(2000);
}

Common Mistakes

Leaving the sensor powered continuously in wet soil, which causes the electrodes to corrode within days. Solution: power it through a digital pin only when taking a reading (for one second every hour).

Next Lesson

Submersible Water Pumps