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T-Slot Photo Interrupter

SKU: ADA3986

$5.62 AUD, inc GST
$5.11 AUD, exc GST

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T-Slot Photo Interrupter
5.62 AUD

SKU: ADA3986

$5.62 AUD, inc GST
$5.11 AUD, exc GST


  • $6.95 Standard (2-4 days, tracked)
  • $9.95 Express (Overnight*, tracked)
  • $3 Economy Post* (3-7 days, no tracking)
  • FREE Pickup (Newcastle only)

Shipping costs may increase for heavy products or large orders.

Exact shipping can be calculated on the view cart page.

*Conditions apply, see shipping tab below.

This T-Slot Photo Interrupter is a simple plastic sensor with two elements - an IR LED and an IR photo-transistor, situated across a U-shaped gap. You can control the IR LED and turn it on to transmit IR light across the gap, to the detector on the other side. This makes it perfect for detecting when something is in the slot - when there's something blocking the light, the sensor turns off, when the object goes away, the sensor receives the IR light and turns on.

These sensors are handy when you want to detect if something has passed through the sensor slot, we think it's great when paired with our slotted encoder wheels - as you can see we have a demo that will count the number of transitions (slots) over a second, extrapolate that to RPM, and display on an OLED. This sensor is extra fancy with a red LED on the side to let you know when the sensor is triggered, and built in protection circuitry.

We will mention the one down-side to this sensor is that the circuitry inside has power requirements - the Vin line must be powered by at least 5V. But, the output transistor is open-collector so you can connect a pullup resistor to 3V for 3.3v logic if you need. So, as long as you have some 5V power output, you can use it with a 3V device like the Feather shown in the demo.

This version does not have a cable attached, but it does have nicely labeled pads.

  • (+) symbol - VCC (logic circuit power 5-24V)
  • L - LED configuration, see datasheet for options but we just tie to VCC
  • OUT - transistor output. Open collector so you must connect a pullup resistor to your logic level.
  • (-) symbol - Ground

Technical Details

  • Weight: 2g
  • Gap width: 5mm
  • Sensing distance: 5mm
  • Light source: Infrared LED (940 nm)
  • Power supply voltage: 5 to 24 VDC ±10% (ripple (p-p)10% max.)
  • Current consumption: 35 mA max
  • Control output (output type): NPN Open collector output
  • Control output (load power supply voltage): 5 to 24 VDC
  • Control output (load current): 100 mA max
  • Response frequency elements: 1 kHz min. (average 3 kHz)
  • See the datasheet for more information and dimensional diagrams, this is equivalent to part #EE-SX672

This optoreflector tutorial might be handy for understanding how these sensors work

Documentation and Resources:

Product Comments

Exact shipping can be calculated on the view cart page (no login required).

We deliver Australia-wide with these options:

  • $3 for Small Items (3-7 days, not tracked, only available on selected small items)
  • $6.95 for Standard Post (2-4 days, tracked)
  • $9.95 for Express Post (Overnight for most of Australia, 2+ days for rural, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region (only after we email you to notify your order is ready)

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $11.49 for Pack and Track (3+ days, tracked)
  • $16.50 for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount might increment based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
NSW, 2289

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

Have a product question? We're here to help!