Help Required on Auto Water for Plants

Hi Friends,

I have a 3.5V~12V Immersible Water Pump and as per its specifications it works at 60mA to 500mA and a Moisture Sensor for the plants. Both I have purchased from DFRobot.

The Immersible pump product I am talking about is : [url=http://www.dfrobot.com/index.php?route=product/product&product_id=667]http://www.dfrobot.com/index.php?route=product/product&product_id=667[/url]

The problem I am facing is with powering the pump using the Arduino UNO with any of the digital pins. When I connect it directly to 5V pin it works fine. So I assume its not getting the required power to start the pump.

My Sketch looks as

[code]
int sensorPin = A0;
int sensorValue = 0;
int pumpPin = 2;
int ledPin = 13;


void setup() {

Serial.begin(9600);

pinMode(pumpPin,OUTPUT);
pinMode(ledPin,OUTPUT);
digitalWrite(pumpPin,LOW);
digitalWrite(ledPin,LOW);

}

void loop() {
// read the value from the sensor:
sensorValue = analogRead(sensorPin);


if (sensorValue >= 500){
digitalWrite(pumpPin,LOW);
digitalWrite(ledPin,LOW);
}
else
{
//Start the Pump and the LED
digitalWrite(pumpPin,HIGH);
digitalWrite(ledPin,HIGH);
}

Serial.println(sensorValue);
delay(1000);

}[/code]

Everything works fine except powering the pump through the DigitalPins. Any suggestions on how to solve this.

Regards,
Vijay