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Line Tracker Mouse

A complete set of parts to build a Line Following Robot. 3 photo sensors are used as the robot's eyes to allow it to follow a black line.

Availability: In Stock.

Code1+ 5+
(£19.80 incl VAT)
(£18.60 incl VAT)

A complete kit of electronic and mechanical parts to build a line following robot. Three photo sensors are used as the robots ‘eyes’ to allow it to follow a black line, drawn on paper or taped to the floor.

Requires 4x AA batteries available separately.

Full assembly instructions included.


Posted by Caleb, Tuesday, 24 November 2015 on product Line Tracker Mouse


Hi My mouse will only follow a line when it's turning to the right. As soon as the line turns left the mouse just goes straight just wandering what the cause may be


  • Posted by Michael Lockhart on Tuesday, 24 November 2015

    It would be advisable to check the Photo interrupter is wired in correctly and isn’t being obstructed by an object. The line also needs to be thick enough to be picked up and against a white background to ensure it is clear, a standard roll of insulating tape is a good thickness.

Posted by Brody, Tuesday, 23 December 2014 on product Line Tracker Mouse


I am modifying my line tracking mouse. Wondering what is the best way to speed the mouse up?


  • Posted by Michael Lockhart on Tuesday, 23 December 2014

    It isn’t possible to increase the speed of the line tracker mouse, this is because if you start changing the gears to increase speed, the motor wouldn’t have enough torque and therefore wouldn’t run. The product has been designed with optimum speed while keeping the components small.

Posted by Martin Smith, Thursday, 13 November 2014 on product Line Tracker Mouse


One of the green gears in one of the kits has the wrong number of teeth. It looks very similar to the correct one but does not fit. How can a get a replacement please?

Posted by Preston Bishop, Friday, 11 April 2014 on product Line Tracker Mouse


i have assembled 2 seperate robots and with both of them i have encountered problems. when the robot detects the left and centre, the right wheel turns. when it detects the right and centre, the left wheel turns. when it detects all 3, only the left wheel turns. and when it detects only the centre, both wheels turn but at different speeds. ( the left turning faster than the right ). This is causing the robot to just rotate constantly. this has happened on both models. have you ever encountered this problem and if so, is there a solution? i look forward to your reply, Preston Bishop.


  • Posted by Matt Macleod on Friday, 11 April 2014
    I suspect that the issue is with the line rather than the robot. Firstly I've made the assumption that you have a black line on a white background, I've gone for three quarter inch thick black insulating tape on a white background which works really well. If the line is too thin then there is a chance that the sensor misses it, too thick and all three sensors will pick it up, with a standard roll of insulating tape it is fine. When it detects left and centre the mouse is about to head off to the right of the line, so the right wheel spins forward, which brings back pointing down the line and just the centre sensor is on. The opposite is true when the right and centre sensors are on, when the left wheel spins bringing it back on line. The centre sensor should always be on and additionally an edge sensor may also be on. There should never be a case when all three sensors are either on or off. If all three are off the line is not being detected, if all three are on then it is too wide. The two motors should run at approximately the same speed as each other but it doesn't matter if they don’t, as if one is faster it will cause the robot to move off the line, when that motor will stop allowing the other motor to catch up.
Posted by anonymous, Tuesday, 5 March 2013 on product Line Tracker Mouse


what are the details of the green LEDs as one has stopped working.


  • Posted by Aaron Sturman on Tuesday, 5 March 2013
    It is unusual that the LED has broken, they normally last for years and years so I would check the soldering and confirm that it hasn?t just come loose first. If that doesn?t fix it then pretty much any standard brightness LED should make a fine replacement. You might want to check if the LED is 3mm or 5mm though if you want it to be the same size.

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