This Photo Interrupter Module is widely used in motor speed detection, pulse count, the position limit, etc. It will trigger a signal when light between the sensor's gap is blocked.
It works with 3.3V to 5VDC, and gives a HIGH on DO pin when the beam is blocked, and a LOW output when the beam is unblocked.
Note: Sensor only. TT Motor and encoder disc are not included.
Dimension: 32mm x 14mm