Pololu QTR-8RC User Manual
Page 9
depends on your microcontroller’s I/O line characteristics. Meaningful results can be available within 1 ms in typical
cases (i.e. when not trying to measure subtle differences in low-reflectance scenarios), allowing up to 1 kHz sampling
of all 8 sensors. If lower-frequency sampling is sufficient, substantial power savings can be realized by using the
LEDON pin to turn off the LEDs. For example, if a 100 Hz sampling rate is acceptable, the LEDs can be off 90% of
the time, lowering average current consumption from 100 mA to 10 mA.
If you want to achieve high frequency sampling rates, we recommend you mount your sensors 0.125" away from the
surface. The greater your distance from the surface, the lower the overall reflectance will be, which in turn will result
in longer decay times. We recommend you mount your sensors no more than 0.375" away from the surface. Please
see our
for more information.
QTR-8A and QTR-8RC Reflectance Sensor Array User's Guide
© 2001–2014 Pololu Corporation
5. Module Connections
Page 9 of 12