Chat

QTR-3RC Reflectance Sensor Array

Clearance
QTR-3RC Reflectance Sensor Array
  • QTR-3RC Reflectie Sensor Array 100x80
  • QTR-3RC Reflectie Sensor Array 100x80
  • QTR-3RC Reflectie Sensor Array 100x80
  • QTR-3RC Reflectie Sensor Array 100x80
  • QTR-3RC Reflectie Sensor Array 100x80
  • QTR-3RC Reflectie Sensor Array 100x80
Review score
5.0 / 5.0

Item numberPololu2457
BrandPololu
Model2457
Stock
Only ... piece left in stock
Ordered before 23:59, shipped today.
Shipped from  € 25 - United States

Clearance

Sale of residual stock, the offer applies as long as the stock lasts.
Sold per piece € 5,65
€ 3,39
Add to cart

Description

The QTR-3RC 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 three IR emitter and receiver (phototransistor) pairs. With sensors spaced at intervals of 0.375″ (9.525 mm) along of the board’s longer axis, this array works well as a minimal detector for line-following robots, as line-following courses are commonly made using 3/4″ (19 mm) black electrical tape. The middle sensor is slightly offset along the short axis of the board.

To use a sensor, you must first charge the output node by applying a voltage to its OUT pin. You can then read the reflectance by withdrawing the externally supplied voltage and timing how long it takes the output voltage to decay due to the integrated phototransistor. Shorter decay time is an indication of greater reflection. This measurement approach has several advantages, especially when multiple units are used:

No analog-to-digital converter (ADC) is required
Improved sensitivity over voltage-divider analog output
Parallel reading of multiple sensors is possible with most microcontrollers
The LED current-limiting resistors are set to deliver approximately 17 mA to the LEDs when VCC is 5 V, making the total board consumption just over 50 mA. 

Question and answer

Reviews

The Netherlands
5 stars
Deze sensoren hebben een analoge output, houd daar rekening mee. direct gecombineerd met een bijvoorbeeld een arduiino heb je een hele kleine afstand tot een trigger gedetecteerd wordt. 1 a 2mm
Placed on 



Logo QTR-3RC Reflectance Sensor Array
QTR-3RC Reflectance Sensor ArrayClick a star to leave your review