Pololu 38 kHz IR Proximity Sensor, Fixed Gain, Low Brightness (irs05a)
This module features a fixed-gain, 38 kHz modulated IR sensor and a corresponding IR LED with oscillator circuit to make a tiny proximity sensor. This low-brightness version draws an average of 8 mA and has a typical sensing range up to approximately 12 inches (30 cm).
Alternatives available with variations in these parameter(s): maximum range
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Printable schematic diagram for the Pololu 38 kHz IR proximity sensor (original irs05a version).