MR003-007.1 Analog Reflectance Sensor

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The MR003-007.1 Analog Reflectance Sensor carries an infrared LED and phototransistor pair.

The phototransistor is connected to a pull-up resistor to form a voltage divider that produces an analog voltage output between 0V and +5V as a function of the reflected IR. Lower output voltage is an indication of greater reflection.

The LED current-limiting resistor is set to deliver approximately 20mA. The current requirement can be met by some microcontroller I/O lines, allowing the sensor to be powered up and down through an I/O line to conserve power.

Because of its small size, multiple units can easily be arranged to fit various applications such as line following robots and proximity/edge detection


Supply voltage +5V
Supply current 20mA typ
Operating temperature -25°C / +85°C
Optimal sensing distance 1/8” (3mm)
Interface Analog
Dimensions 0.5” x 0.31” (12.7 x 7.9 mm)
Weight 0.01oz (0.3g)


 datasheet (English)

 datasheet (Italiano)

Useful Links

Analog Reflectance Sensor test sketch