Overview
The Pololu QTR-8A Reflectance Sensor Array is a reflectance sensor array module with eight independent IR sensing channels and analog voltage outputs. It is designed for line detection, proximity sensing, and general reflectance measurement, making it suitable for applications where reflected infrared light must be evaluated by a microcontroller with ADC inputs.
The module operates from 3.3 V to 5.0 V and provides an output voltage range from 0 V to VIN on each channel. The sensor spacing is 9.525 mm, and the optimal sensing distance is 3 mm. The maximum recommended sensing distance is 6 mm. According to the provided data, the board current consumption is 100 mA.
The board measures 74.9 x 12.7 x 3.2 mm and weighs 3.09 g without header pins. It includes integrated current limiting for the IR LEDs and is specified for adaptable operation with 3.3 V and 5 V systems.
Technical Data
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer | Pololu | |
| Manufacturer Part Number | 960 | |
| SKU | PO960 | |
| Product Type | Reflectance sensor array module | |
| Sensor channel count | 8 | |
| Interface type | 8x analog voltage outputs, LED control input | |
| Sensor spacing | 9.525 | mm |
| Operating voltage min. | 3.3 | V |
| Operating voltage max. | 5.0 | V |
| Supply current | 100.0 | mA |
| Output voltage min. | 0.0 | V |
| Output voltage max. | 5.0 | V |
| Optimal sensing distance | 3.0 | mm |
| Max. recommended sensing distance | 6.0 | mm |
| Dimensions | 74.9 x 12.7 x 3.2 | mm |
| Weight | 3.09 | g |
| Current limiting | None |
Applications
- Line-following robots
- Proximity sensing
- Edge detection
- Contrast detection on light and dark surfaces
- Basic reflectance measurement in mobile robotic systems
Scope of Delivery
- 1x Pololu QTR-8A reflectance sensor array module
- 1x male header strip, unsoldered