KY-010 Photo Interrupter Light Blocking Sensor for Arduino

Prototyping and Engineering Tips from Robogears

• Tachometer Setup: To measure motor speed, mount a slotted encoder disk on the motor shaft. As the disk spins, the "teeth" will block the light beam, creating a series of pulses. By counting these pulses over time in your code, you can calculate the exact RPM.

• Pull-up Resistor: While most KY-010 modules have a built-in resistor, some versions require you to enable the internal pull-up resistor on your microcontroller pin (pinMode(pin, INPUT_PULLUP)) for a stable signal.

• Ambient Light Interference: Although the IR detector is tuned to a specific wavelength, very bright direct sunlight can occasionally "leak" into the sensor and cause false triggers. For outdoor robots, add a small 3D-printed shroud or piece of black tape to shade the sensor slot.

• The "Clearance" Rule: Ensure your encoder disk or moving part is centered in the 5mm slot. If the part rubs against the plastic housing of the sensor, it will create friction and eventually damage both the disk and the sensor.

Package Includes

• 1 x KY-010 Broken Light Blocking Sensor Module

Disclaimer

This sensor requires an opaque object to block the beam. Transparent or semi-transparent plastics may not trigger the sensor reliably. Ensure the IR emitter and receiver are kept free of dust for consistent performance.