QTR-8A Reflectance Sensor Array

QTR-8A Reflectance Sensor Array

ToF Range Finder Senor - VL6180

ToF Range Finder Senor - VL6180

QTR-8RC Reflectance Sensor Array

99,00 kr 79,20 kr
I lager
Fåtal i lager: 3 st
SKU
POL-0961
  • Köp 5 för 94,05 kr 75,24 kr st och spara 6%
The QTR-8RC 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 uses a capacitor discharge circuit that allows a digital I/O line on a microcontroller to take an analog reading of reflected IR by measuring the discharge time of the capacitor. Shorter capacitor discharge time 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.

The LED current-limiting resistors for 5 V operation are arranged in two stages; this allows a simple bypass of one stage to enable operation at 3.3 V. The LED current is approximately 20-25 mA, making the total board consumption just under 100 mA.
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Artikelnr POL-0961
Annan benämning N/A
Infolänkar Pololu
Short Description N/A
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