برد توسعه، کیت‌ و پروگرامر برد ارزیابی (Evaluation) بُرد ارزیابی سنسور

Product Attributes

Introduction

This infrared LED/phototransistor array is designed for precise detection of reflectance changes (e.g., line detection). It operates over a supply voltage range of 2.9V to 5.5V, provides adjustable brightness control independent of supply voltage, and features independent control of odd and even emitters. Generally, the closer the object, the higher the contrast between light and dark readings; however, highly reflective objects can typically be detected at distances of approximately 50mm. This version uses the traditional lensless QTR sensors. These reflective sensors consist of linear arrays of IR emitter/phototransistor pair modules in high-density (4mm pitch) or medium-density (8mm pitch) configurations, suitable for applications requiring reflectance change detection. Reflectance changes may result from color variations at a fixed distance (e.g., detecting a black line on a white surface) or from changes in the distance or presence of objects in front of the sensor. Multiple sensor count and pitch options are available to select the ideal configuration for your application. Since all outputs are independent, only selected channels can be connected to achieve irregular or non-standard sensor spacing. Unlike the original QTR sensor modules, these units integrate LED drivers that provide independent brightness control over a wide supply voltage range of 2.9V to 5.5V and support optional dimming across 32 brightness levels. For high-density modules with five or more sensors and medium-density modules with eleven or more sensors, odd and even LEDs have independent control, offering additional options for detecting reflected light from different angles. Two sensor options are available: the "QTR" version uses lower-cost lensless sensor modules, while the "QTRX" version uses high-performance lensed sensor modules that achieve comparable performance at lower IR LED current. Additionally, several single-channel modules designated "QTRXL" provide ultra-long detection range through QTRX-style sensor modules with higher emitter current. Each sensor option offers two output types: the "A" version outputs an analog voltage between 0V and VCC, while the "RC" version outputs a signal readable via a microcontroller's digital I/O line by driving the line high, then releasing it and timing how long it takes to read low (typically ranging from a few microseconds to a few milliseconds). A lower output voltage or shorter voltage decay time indicates higher reflectance. An Arduino library simplifies the use of these sensor modules, providing methods for controlling emitters, calibrating modules, and reading individual sensor values from either the A or RC version, as well as methods specifically for line-following applications to calculate the position of a line beneath the array. Note that these sensor arrays do not include any headers or connectors.