Pololu QTR 3-bit Line Hunter Sensor Array Module for Arduino
Price in Sri Lanka

• Dimensions: 1.25″ × 0.3″ × 0.1″ (32 × 8 × 3 mm) (without header pins installed)
• Operating voltage: 5.0 V
• Supply current: 50 mA
• Output format: 3 analog voltages
• Output voltage range: 0 V to supplied voltage
• Optimal sensing distance: 0.125" (3 mm)
• Maximum recommended sensing distance: 0.25" (6 mm)
• Weight without header pins: 0.02 oz (0.6 g)

Interfacing with the QTR-3A Outputs

There are several ways you can interface with the QTR-3A outputs:

• Use a microcontroller’s analog-to-digital converter (ADC) to measure the voltages.
• Use a comparator with an adjustable threshold to convert each analog voltage into a digital (i.e. black/white) signal that can be read by the digital I/O line of a microcontroller.
• Connect each output directly to a digital I/O line of a microcontroller and rely upon its internal comparator.