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NEW PRODUCTS – T-Slot Photo Interrupters – Pre-Wired + Un-Wired

Composite 3985 3986

NEW PRODUCTS – T-Slot Photo Interrupters – Pre-Wired + Un-Wired


We’ve got these two sensors ready for your maker projects! First up, the sensor by itself!

3986 iso 01 ORIG 2018 11

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.

3986 top 01 ORIG 2018 11

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

3986 quarter ORIG 2018 11

Onto the wired version!


3985 top ORIG 2018 11

This T-Slot Photo Interrupter with Cable 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.

3985 detail 02 ORIG 2018 11

3985 detail 01 ORIG 2018 11

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.

3985 quarter ORIG 2018 11

This version is very fancy with a cable attached:

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

3985

In stock and shipping now! T-Slot Photo Interrupters – Un-Wired and Pre-Wired


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