Line follower bot help needed

Hi

Am in process of building a line follower bot using ArduinoBoardDuemilanove and Line sensor array purchased from roboworld

The Sensor array requires 300mA however Arduino provided 30mA at 5v.So am using exteranal supply.Am confused regarding the connection between Arduino and sensor array.
In the manual it was written to short gnd of sensor with microconroller gnd
so is this connection correct??

Sensor array gives TTL output so should i connect them to digital pins or analog pins of arduino.And how to caliberate the sensor array.

First, you should post links to the devices you are asking about.

Second, there is a difference between connecting ground of the sensor to ground of the Arduino and shorting something out. Connecting the grounds together is required. Shorting something is NOT.

Sensor array gives TTL output so should i connect them to digital pins or analog pins of arduino.And how to caliberate the sensor array.

What does the data sheet for the sensor say?

The Link to the sensor array: http://tinyurl.com/26sguow Data sheet: http://tinyurl.com/2vd36g3

From Datasheet:

This is an easy-to-use module with 7 reflective sensors. It can be easily used with a microcontroller as it gives TTL compatible outputs. The output pins can be directly connected to microcontroller pins which give active low output when white line is detected.

What does this imply.

I trust its something bigger than a standard PP3 type 9v battery if the sensor array eats 300mA :)

The output pins can be directly connected to microcontroller pins which give active low output when white line is detected.

What does this imply.

It implies that the sensor outputs HIGH for dark and LOW for light. This implies that the output is digital, rather than analog.

And how to caliberate the sensor array.

Send e-mail to robokits.co.in and ask them. That's a pretty poor data sheet.