QTR-8A Reflectance Sensor Array

Item number Pololu960 Brand Pololu Model 960 Share
QTR-8A Reflectance Sensor Array

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The QTR-8A reflectance sensor array is intended as a line sensor, but it can be used as a general-purpose proximity or reflectance sensor. The module is a convenient carrier for eight IR emitter and receiver (phototransistor) pairs evenly spaced at intervals of 0.375" (9.525 mm). Each phototransistor is connected to a pull-up resistor to form a voltage divider that produces an analog voltage output between 0 V and VIN (which is typically 5 V) as a function of the reflected IR. Lower output voltage is an indication of greater reflection.The outputs are all independent, but the LEDs are arranged in pairs to halve current consumption. The LEDs are controlled by a MOSFET with a gate normally pulled high, allowing the LEDs to be turned off by setting the MOSFET gate to a low voltage. Turning the LEDs off might be advantageous for limiting power consumption when the sensors are not in use or for varying the effective brightness of the LEDs through PWM control.


Brand information
Brand Pololu
Communication analog
Connection data
Channels 8
Pitch 9,5mm
€ 11,25€ 9,30 Excl. VAT (NL)
Ordered before 23:59, shipped today. ... pieces in stock Almost sold out
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Customer Reviews

The QTR-8A Sensor really took my line following robot project to the next level! The accuracy with which these sensors detect the line is impressive and has significantly improved the performance of my robot. The fact that the module contains 8 sensors gave me a lot of flexibility in designing my robot and optimizing the line following logic. The only minor gripe is that it took me a while to get the sensor array set up optimally for my specific use case, but once everything was set up properly it worked great.
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