QTR-3A Reflectance Sensor Array - Analog

QTR-3A Reflectance Sensor Array - Analog info

QTR-3A 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 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 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.

QTR-3A Reflectance Sensor Array - Analog - General Specifications

• Line sensor
• General purpose proximity or reflectance sensor
• 3 IR emitter and receiver pairs
• Maximum 6mm sensing range

QTR-3A Reflectance Sensor Array - Analog - Technical Specifications

• Dimensions: 32mm x 8mm x 3mm (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: 0.6g

Videos

Documents

QTR-3A reflectance sensor array schematic diagram

Datasheet for the Sharp GP2S60 compact reflective photointerrupter

Pololu QTR Reflectance Sensor Application Note: https://www.pololu.com/docs/0J13

Pololu AVR C/C++ Library User’s Guide: https://www.pololu.com/docs/0J20

Arduino Library for the Pololu QTR Reflectance Sensors: https://www.pololu.com/docs/0J19

Pololu AVR Library Command Reference: https://www.pololu.com/docs/0J18

References

Pololu Web Site: https://www.pololu.com/product/2456