Reflectance based Proximity Sensor using Si1102

This reflective sensor module is a high-performance 0-5 cm active proximity detector. The sensor can provide a range up to 50cm with higher current infra-red LED and current limit resistor R2, R4 used across IR LED. Because the sensor operates on an absolute reflectance threshold principle, it avoids the ambiguity of motion-based proximity systems. The Si1102 consists of a patented, high-EMI immunity, differential photodiode and a signal-processing IC with LED driver and a high-gain optical receiver. Proximity detection is based on measurements of reflected light from a strobed. The sensor board is based on Si1102 from Silicon Labs. The Si1102 is an active optical reflectance proximity detector with a simple on/off digital output whose state is based upon the comparison of reflected light against a set threshold. An LED sends light pulses whose reflections reach a photodiode and are processed by the Si1102’s analog circuitry.

Reflectance based Proximity Sensor using Si1102 – [Link]

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