The QTR-L-1RC reflection sensor incorporates a right-angled infrared LED and a right-angled phototransistor in a low-cost, tiny 0.9cm × 0.75cm module that can be mounted almost anywhere and is ideal for edge detection and line tracking.
The Pololu QTR-L-1RC reflection sensor carries a rectangular infrared LED and a rectangular phototransistor, both pointing to the front edge of the board. To use the sensor, first charge the output node by applying voltage to the OUT pin. You can then read the reflectance by subtracting the externally applied voltage from the OUT pin and the time it takes for the output voltage to drop due to the integrated phototransistor. Shorter decay times are an indication of increased reflection. This measurement approach has several advantages, especially when multiple units are used:
nbsp; No analog-to-digital converter (ADC) is required.
nbsp; Improved sensitivity via the voltage divider analog output
nbsp; Parallel reading of multiple sensors is possible with most microcontrollers.
>This sensor is designed for use with the board perpendicular to the surface to be scanned, and narrow beam lenses integrated into the infrared LED and phototransistor housings provide an effective range of approximately 1″ (25 mm). Due to its small size, several units can easily be arranged to suit various applications such as line scanning and neckline and edge detection. The QTR-L-1RC is sold in packs of two units.
|Shipping weight:||0,01 Kg|