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QTR-8A Line Sensor (Analog)

Product Code: QTR8A
9,95 USD
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  • This sensor module 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. Each sensor provides a separate analog voltage output.


    Functional Description 

    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). 

    Each phototransistor is connected to a pull-up resistor to form a voltage divider that produces an analog voltage output between 0 V and VIN (which is typically 5 V) as a function of the reflected IR. Lower output voltage 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. 

    Caution!
    QTR-8A model is mostly used with Arduino Nano due to Nano's 8 analog inputs. Arduino Uno don't have 8 analog inut.
  • Size (cm)
    :
    8 x 8 x 1
    Height (cm)
    :
    1
    Weight (Kg)
    :
    0.01
  • All products shipped with sealed in box. All products packaged carefully. Before shipment, we test all electronics and control the mechanics of all products. So you will never be disappointed when you open our JSumo shipment box.

    We have 3 Payment Methods:

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  • All products shipped with sealed in box. All products packaged carefully. Before shipment, we test all electronics and control the mechanics of all products. So you will never be disappointed when you open our JSumo shipment box.

    We have 2 Shipment Options:

    • Registered Air Mail ( Fixed Price 9,95 USD, Free On Orders Over 199 USD)
      DHL Worldwide Express Shipment (Based on weight)

    Example Time Table For International Shipments with Air Mail

    Europe Countries

    2-3 Weeks (Sometimes Less)

    USA

    3-4 Weeks

    *Mexico

    4-6 Weeks

    African Countries

    4-6 Weeks

    Japan

    2-3 Weeks

    Qatar

    3-4 Weeks

    Brazil

    3-6 Weeks

    Malaysia

    4-5 Weeks

    *Peru, Ecuador, Colombia

    4-6 Weeks

    Philippines

    4-6 Weeks

    Russia

    3-4 Weeks

    Saudi Arabia

    3-4 Weeks

    Middle Asia Countries

    3-4 Weeks

    Azerbaijan

    2-3 Weeks

    Mongolia, China

    4-6 Weeks

    United Kingdom, Ireland

    3-4 Weeks

    Latvia, Estonia, Lithuania

    3 Weeks

    Canada

    2-3 Weeks

    *Mexico, Peru, Ecuador & Colombia shipments can lose too much time at transits after exiting.

    We are sending shipment code but this can be only trackable inside your country. We suggest this countries to DHL express (3-5 Days arrival time) for more reliable and tracking option.

    These countries are the only examples. If your country is not in the list, don't be afraid. We are shipping to all over the world including your country too:)

    What is your return policy?

    You may return a product for refund or exchange (if due to our error) within 30 days of the order shipment date. (The order shipment date and order notification are provided to you by email). All returns must be accompanied with a Return Merchandise Authorisation number (order number #).

    If we shipped you the wrong product, or it arrived defective or damaged

    No problem. Just contact us within 30 days of the item's original shipping date to arrange for the return of your purchase. Send us photo of wrong product. And we will send a replacement or refund you for your purchase, provided the returned item(s) are received back in their original packaging, along with all accessories, warranty cards, manuals, software, etc., where applicable.

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