OSH Park
Modulated Reflectivity Sensor Driver
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Modulated Reflectivity Sensor Driver
by
dewhisna.
2
layer board of
2.11x2.23
inches
(53.49x56.67
mm).
Shared on
April 7th, 2017 03:37.
The Modulated Reflectivity Sensor Driver Board, a.k.a. the Arduino OptoInterrupter PLL Shield for the ProMini PiDuino HAT, was designed to interface two off-the-shelf optical reflective sensors to the Raspberry Pi via an Arduino ProMini PiDuino HAT.
Unlike the OptoInterrupterShield for ProMini PiDuino HAT, this version uses a Phase Locked Loop (PLL) circuit to modulate the reflectivity sensor to prevent false triggering of the sensor from ambient light.
The optical reflective sensors are used to detect the presence of an object by reflecting an infrared LED back to a phototransistor. The Arduino ProMini on the PiDuino HAT will allow “real-time” sensor timing with an accuracy of +/- 4uSec, using a standard 16MHz ProMini board.
Since the ProMini PiDuino HAT, which this board was designed for, uses standard Arduino Uno footprints, this board can also be used on other Arduino compatible boards. It does, however, require an Arduino board that has 5V compatible I/O pins, as this board is designed to run at 5V.