User Manual

using the methods in this class.

Constructor: QTRDimmableAnalog(unsigned char* digitalPins, unsigned char numSensors,

unsigned char numSamplesPerSensor = 4, unsigned char emitterPin =

QTR_NO_EMITTER_PIN)

This constructor just calls init(), below, with one emitter pin for controlling one bank (or both banks

combined).

Constructor: QTRDimmableAnalog(unsigned char* digitalPins, unsigned char numSensors,

unsigned char numSamplesPerSensor, unsigned char oddEmitterPin , unsigned char

evenEmitterPin)

This constructor just calls init(), below, with two emitter pins for controlling two banks separately.

void QTRDimmableAnalog::init(unsigned char* digitalPins, unsigned char numSensors,

unsigned char numSamplesPerSensor = 4, unsigned char emitterPin =

QTR_NO_EMITTER_PIN)

Initializes a QTR-xD-xA or QTRX-xD-xA (analog) sensor array with one emitter pin. This version of

init() works the same as the (non-dimmable) QTRSensorsAnalog version.

void QTRDimmableAnalog::init(unsigned char* digitalPins, unsigned char numSensors,

unsigned char numSamplesPerSensor, unsigned char oddEmitterPin , unsigned char

evenEmitterPin)

Initializes a QTR-xD-xRC or QTRX-xD-xRC (analog) sensor array with two emitter pins for separate

control of the odd and even emitters.

Usage Notes

Calibration

This library allows you to use the calibrate() method to easily calibrate your sensors for the particular

conditions it will encounter. Calibrating your sensors can lead to substantially more reliable sensor

readings, which in turn can help simplify your code since. As such, we recommend you build a

calibration phase into your application’s initialization routine. This can be as simple as a fixed duration

over which you repeated call the calibrate() method. During this calibration phase, you will need to

expose each of your reflectance sensors to the lightest and darkest readings they will encounter. For

example, if you have made a line follower, you will want to slide it across the line during the calibration

phase so the each sensor can get a reading of how dark the line is and how light the ground is. A

sample calibration routine would be:

3. QTRSensors Methods & Usage Notes Page 12 of 15