Line Tracker Mouse

Stock code: 2190

Pricing:Ex VATInc VAT
1+ £19.00
(excl. VAT)
(inc. VAT)
5+ £18.70 £22.44
Discontinued - This page is for reference for existing customers of this product. It is not possible to buy this item.

Bundled options

Line Tracker Mouse plus batteries

large linetrack mouse kit+ 2 pack AA batteries+ 2 pack AA batteries

Total: £20.10ex VAT


Same Day Dispatch

  • Orders placed online before 3:00pm Monday - Friday (excluding public holidays and our Christmas shutdown period) are always dispatched the same day provided the goods are in stock. If the goods are not in stock we will endeavour to contact you as soon as possible to discuss a dispatch date.

UK Deliveries

  • If you live on the UK mainland and don't have any large materials or lithium batteries in your order it will cost £3.95 (£4.74 including VAT) if you spend less than £40 (£48 including VAT).
  • If you spend between £40 and £200 (£48 - £240.00 including VAT, excluding large materials or lithium batteries) delivery is free to most locations, £12 (£14.40 including VAT, excluding large materials or lithium batteries) to Northern Ireland and £15 (£18.00 including VAT, excluding large materials or lithium batteries) to UK remote locations. For a list of postcodes that will be charged the remote location rate: remote area list.
  • If you spend over £200 (£240.00 including VAT, excluding large materials or lithium batteries) delivery is free within the UK.

Rest of the world

  • These orders are sent via UPS, and the cost is dependant on the service you choose at checkout. Alternatively you can choose the free collection option and have your own courier collect it from us. International orders can only be shipped to the registered card address. Please note: International orders may be charged import duty dependant on local import laws and duty rates. These charges are usually billed to you directly from UPS.
  • Delivery times vary for international orders depending on the service selected and the destination. You can see the delivery time and cost at the shipping stage, or by using the shipping estimator from within the shipping basket.


  • If you would like to collect your order, or use your own courier then there is an option you can select during checkout. We do not charge a packaging or handling fee for this service, and you will receive an email when your order has been processed, you can collect half an hour after receipt of this email.

Further Information

Please note: Instructions for using this product (if available) can be found under the product description.
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mouse complete but only one motor runs,done all the usual checks, but plugging the small board in stops the green LED for the motor from working, checked everything three times over,both motors run independently, could it be anything to do with chip? as last letters on it didn't correspond to instruction sheet-EM78P156EP. Actual EM78P156KD18J.
Asked by: john james
Hi John, 'm really sorry to hear that you have been having problems with this. If you contact with your order number we will sort getting a replacement unit out for you.
Answered by: Michael Lockhart

what are the details of the green LEDs as one has stopped working.
Asked by: anonymous
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.
Answered by: Aaron Sturman

i am modifying this robot for my school project. I am wanting to replace the microphone with a infrared sensor. Would you be able to tell me the output voltages/ pulse durations for this component so that i may be able to match the outputs to a compatible infrared sensor?
Asked by: ryan gould
The kit is supplied with assembly instructions, which include the circuit diagram. R1 to R4, Q1 & C2 are associated with the amplification section of the microphone circuit. This signal is however feed into the input of a microcontroller and it will be impossible to know what signal the microcontroller is looking for. I can only suggest connecting a digital oscilloscope to the microcontroller input and see what is present when there is noise on the microphone and then change the circuit to try and match this.
Answered by: Geoff Hampson

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.
Asked by: Preston Bishop
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.
Answered by: Geoff Hampson

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