Operating Voltage 4.5~5.5V
Operating Current 33mA
Output Signal
0.3-2.8 VDC
Dimension
4.5x2.2x1.91mm
Detection Angle
10°
Detection
Distance
20-150 cm
Block Diagram
Figure 1 shows object A located at the limit of the PSD’s range (about 15 cm
away). Notice how that if it were any closer, the light would not hit the PSD at
all. Similarly, if B were moved farther away, its’ light would eventually go past
the ‘top’ of the PSD and would not be seen either (at about 180 cm). This
explains the limits of the GP2Y.
Think of the PSD as a resistor with a large number of taps (wires coming out at
various points along the resistor). When light hits the PSD, it hits one of the
‘taps’ and causes current to flow out each end of the resistor, forming a
voltage divider. As an object moves closer or farther from the sensor,
incoming light hits a different ‘tap’ causing the current coming out each end
of the resistor to change. These currents are compared and a voltage
proportional to the position of the ‘tap’ (and the distance of the object) is
generated.
Technical Specifications
CAUTION:
The sensor is a precision device.
Do Not
attempt to open the unit.
Doing so will ruin the delicate alignment of the optics
!
!
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6
AIRRS+ Manual v1.7
