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A integrated IR LED + IR Detector board for MOVE Motor. It's packed as part of the TM015: Kitronik :MOVE Motor for Micro:bit, can also be bought or used separately for other projects.
On the :MOVE Motor, the sensors are connected to Micro:bit analog input pins 1 and 2. So, we can use "analog read" to get the value ranged in 0-1023.
We bought this from Kironik.co.uk
Check the official document https://kitronik.co.uk/products/56111-kitronik-move-line-following-board