DESCRIPTION
The QTR-1A reflectance sensor carries a single infrared LED and phototransistor pair in an inexpensive, tiny 0.5″ x 0.3″ module that can be mounted almost anywhere and is great for edge detection and line following applications. The reflectance measurement is output as an analogue voltage.
The phototransistor is connected to a pull-up resistor to form a voltage divider that produces an analogue voltage output between 0 V and VIN (which is typically 5 V) as a function of the reflected IR. The lower output voltage is an indication of greater reflection.
The LED current-limiting resistor is set to deliver approximately 20-25 mA to the LED when VIN is 5 V. The current requirement can be met by some microcontroller I/O lines, allowing the sensor to be powered up and down through an I/O line to conserve power.
Because of its small size, multiple units can easily be arranged to fit various applications such as line sensing and proximity/edge detection.
FEATURES
Specifications:
- Dimensions: 0.3″ x 0.5″ x 0.1″ (without header pins installed)
- Operating voltage: 5.0 V
- Supply current: 25 mA
- Output format: analog voltage
- Output voltage range: 0 to supplied voltage
- Optimal sensing distance: 0.125″ (3 mm)
- Maximum recommended sensing distance: 0.25″ (6 mm)
- Weight without header pins: 0.008 oz (0.23 g)
Interfacing with the QTR-1A Output
There are several ways you can interface with the QTR-1A output:
- Use a microcontroller’s analog-to-digital converter (ADC) to measure the voltage.
- Use a comparator with an adjustable threshold to convert the analog voltage into a digital (i.e. black/white) signal that can be read by the digital I/O line of a microcontroller.
- Connect the output directly to the digital I/O line of a microcontroller and rely upon its internal comparator.
This last method will work if you are able to get high reflectance from your white surface as depicted in the left image, but will probably fail if you have a lower-reflectance signal profile.
RESOURCES
For more information visit the manufacturer’s website.
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Prior to shipment the items, our staff will carry out a thorough inspection on the products you have ordered. The majority of orders will be shipped within 48 hours. The estimated delivery time is between 3 and 7 days.
Returns
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Our policy lasts for thirty days. We cannot replace or refund your purchase if it has been 30 days since you purchased it.
In order to be eligible for a refund, your item must be in good condition and in the same condition as you received it. It must also be returned in the original packaging.
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