Pololu QTR-8RC - Manual (Page 10)

6. Breaking into Two Submodules
If you don’t need or cannot fit all eight sensors, the QTR-8x arrays can each be separated into two smaller sensor
arrays that can function independently: a two-sensor array and a six-sensor array.
To break the board, use a sharp knife (e.g. hobby knife or box cutter) to score along the perforation (row of vias)
between sensors 6 and 7. Place the long side of board on a flat surface with an edge, such as a table, so the perforation
lines up with the edge. Hold the board against the table and press firmly down on the overhanging piece until it snaps
off. If it doesn’t feel like the PC board is breaking, make the score deeper. You might want to file the broken edges of
the boards.
Once the board is broken, you will need to modify the small piece slightly before it becomes functional. If you are
operating at a Vcc of 5 V, solder the 100 Ohm through-hole resistor that was included with your QTR-8x across the
two pins as shown below:
QTR-8A and QTR-8RC Reflectance Sensor Array User's Guide © 2001–2014 Pololu Corporation
6. Breaking into Two Submodules Page 10 of 12