Octopus Photo Interrupter Sensor(EF04012)
Introduction
Photo Interrupter Sensor is a sensor module based on ITR9608 photoelectric switch that can be used with micro:bit.

Characteristics
The 3-pins ports is easy to plug and play. It can work with micro:bit in 3V.
Specifications
| Item | Parameter |
|---|---|
| SKU | EF04012 |
| ITR9608 Optoelectronic switch | Built-in infrared transmitter and receiver tube |
| LED with signal | Signal Indicator |
| Working Voltage | DC 3.0V-5.0V |
| Connector Type | Digital |
| Pins Definition | 1-Signal 2-VCC 3-GND |
| Response | Quick to response with high sensitivity |
| Stability | Stable and durable |
Outlook and Dimensions

Quick to Start
Connection diagram
Connect to P1 port as the picture shows.
Take sensor:bit for example

Program as the picture shows
Show the value variable. Add 1 on the value variable each time when the Photo Interrupter Sensor detects a value.

Reference
Links: https://makecode.microbit.org/_VcJWCh4hw97j
You can also download it directly below:
Result
The on start micro:bit shows number 0, the counting system would add one each time when objects are put on the Optoelectronic switch.