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).

The Pololu QTR-8A [http://www.pololu.com/product/960] and QTR-8RC [http://www.pololu.com/product/961] reflectance sensor arrays are intended as line sensors, but they can be used as a general-purpose proximity or reflectance

The QTR-8A uses a voltage divider for each sensor’s output while the QTR-8RC uses an RC circuit. This produces the most visible difference between the two: eight 47k voltage divider resistors (black components with “473” written on them in yellow) on the QTR-8A are replaced by capacitors (tan components) on the QTR-8RC.

2019年3月18日 · I’ll show you how to program a QTR sensor array, let’s get started. As far as parts go, assuming you’ve already built the robot we just need the following items. As always, there is a video you can watch if you’re more into that sort of thing. This video covers attaching the sensor and testing the line array.

2023年6月28日 · 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 array module is a convenient carrier for eight IR emitter and receiver (phototransistor) pairs …

2019年3月6日 · Pololu offered, until recently two different eight sensor arrays, the QTR-8RC and the QTR-8A. The RC array uses an RC circuit and capacitor decay time to determine a reflectance amount whereas the A array uses a voltage divider to determine a reflectance amount.

2014年12月1日 · The optimal sensing distance for the QTR-8RC is 3mm and the maximum recommended sensing distance is 9.5mm. If you are not already, can try obtaining your measurements with the face of the QTR sensors about 3mm …

The Pololu QTR-8A Reflectance Sensor Array 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.

2024年8月28日 · It will generally depend on your microcontroller, but in most cases, the RC version is going to be quicker. Since the RC version is a digital pulse, you can take all of the readings in parallel, whereas if you’re using a microcontroller with only one ADC, your analog readings would need to be taken sequentially.

The QTR-8A Reflectance Sensor Array by Pololu is an array of 8 reflectance sensors designed for line following and edge detection in robotics. Each sensor in the array provides an analog output that corresponds to the reflectance of the surface beneath it.