QTR-8A Reflectance Sensor Array
This sensor module has 8 IR LED/phototransistor pairs mounted on a 0.375" pitch, making it a great detector for a line-following robot. Pairs of LEDs are arranged in series to halve current consumption, and a MOSFET allows the LEDs to be turned off for additional sensing or power-savings options. Each sensor provides a separate analog voltage output.
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QTR-8A reflectance sensor array.
Schematic diagram of the QTR-8A reflectance sensor array.
QTR-8A reflectance sensor array with included 25-pin 0.1" header strip and 100 Ohm through-hole resistor.
The QTR-8A reflectance sensor can separate into two smaller, functional arrays of length 2 and 6.
The bottom of the QTR-8A reflectance sensor array PCB, showing silkscreen labeling.
Solder the included resistor to the 2-sensor array piece as shown to make the separated piece functional.
QTR-8A and QTR-8RC reflectance sensor array dimensions.
QTR-8x reflectance sensor array with 8×2 connection pins labeled.
QTR-8x reflectance sensor array with 11×1 connection pins labeled.
QTR-8A reflectance sensor array on a 3/4" line with a quarter for size reference.
QTR-1A output 1/8" away from a spinning white disk with a black line on it.
QTR-1A output 3/8" away from a spinning white disk with a black line on it.
QTR sensor size comparison. Clockwise from top left: QTR-3RC, QTR-1RC, QTR-L-1RC, QTR-8RC.