8 Channel Reflectance Sensor Array Module Qtr-8A
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 .
- Delivery in 2 to 4 working daysFree in Islamabad & Rawalpindi above Rs 5,000
- Cash on deliveryPay when your parcel arrives
- 7-day checking warrantyDead-on-arrival items replaced
- Packed with careAnti-static & padded packaging
Highlights
- No analogue-to-digital converter (ADC) is required
- Improved sensitivity over voltage-divider analogue output
- Parallel reading of multiple sensors is possible with most microcontrollers
- Parallel reading allows optimized use of LED power enable the option
- Use a microcontroller?s analogue-to-digital converter (ADC) to measure the voltages.
- Connect each output directly to a digital I/O line of a microcontroller and rely on its internal comparator.
- 1 x Reflectance Sensor Array QTR-8A
Specifications
- Operating voltage
- 3.3-5.0 V
- Supply current
- 100 mA
- Output format
- 8 digital I/O-compatible signals that can be read as a timed high pulse
- Optimal sensing distance
- 0.125" (3 mm)
- Dimensions
- 2.95″ x 0.5″ x 0.125″ (without header pins installed)
- Weight without header pins
- 0.11oz (3.09g)
About this product
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 array module is a convenient carrier for eight IR emitter and receiver (phototransistor) pairs evenly spaced at intervals of 0.375″ (9.525mm). Each phototransistor is connected to a pull-up resistor to form a voltage divider that produces an analogue voltage output between 0V and VIN (which is typically 5V) as a function of the reflected IR. The lower output voltage is an indication of greater reflection.
Features Of Reflectance Sensor Array 8 channel Line Following Line Tracking Sensor Module QTR 8A:
Specifications Of QTR-8A Reflectance Sensor Array:
Ways Of Interface With QTR-8A Outputs:
•Use a comparator with an adjustable threshold to convert each analogue voltage into a digital (i.e. black/white) signal that can be read by the digital I/O line of a microcontroller.
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 like the one on the right.
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