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Submersible Water Pumps | NexaLearn IoT Lab | NexaLearn

Smart Agriculture25 دقيقة

Submersible Water Pumps

How to pump water automatically based on a soil moisture sensor.

Lesson Content

A small 5V water pump draws between 150mA and 300mA — far more than an Arduino pin can handle (max 20mA). Therefore we use a transistor or relay to open and close the pump's power from a battery or separate power source.

Components Needed

Arduino Unoمضخة مياه 5VRelay Moduleمصدر طاقة 5V قوي

Wiring Notes

Use a relay to cut the positive wire of the pump. Connect the relay and Arduino to a shared GND if using two power sources.

Code Example

const int pumpPin = 7;
void setup() {
  pinMode(pumpPin, OUTPUT);
}
void loop() {
  digitalWrite(pumpPin, HIGH); // تشغيل المضخة
  delay(3000); // ضخ الماء لـ 3 ثوانٍ
  digitalWrite(pumpPin, LOW);
  delay(10000);
}

Common Mistakes

Running the pump in air (without submerging it in water), which quickly damages the internal impeller due to thermal friction.

Next Lesson

Motion Sensor (PIR)