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I'm fiddling with a toy and I found this part. I think its purpose is give feedback to a microcontroller about the angle of the DC motors.

This is the part:

enter image description here

This is how it's placed with the motors:

enter image description here

This is where it goes on the main PCB:

enter image description here

I hope you know this part. I don't know how to search for it so that's why I'm here.

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  • \$\begingroup\$ That one's an assembly but there are similar opto-sensors (shaped like the black covers) readily available. \$\endgroup\$
    – user16324
    Mar 25, 2021 at 14:38
  • \$\begingroup\$ en.wikipedia.org/wiki/Rotary_encoder \$\endgroup\$
    – Steve
    Mar 25, 2021 at 22:13

2 Answers 2

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I hope you know this part. I dont know how to search for it so that's why im here. Any help would be appreciated.

enter image description here

It's a slotted LED/photodiode (or phototransistor) detector and comes in various size and shapes and is made by several well-known manufacturers.

To name but two.

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The combo photodiode-led allows the micro to detect motor movement. The LED shines through the slots in the wheel, illuminating the photodiode and sending an impulse to the microcontroller. The slotted wheel allows only information about the speed to be sensed, not an absolute position. A more complex arrangement, with patterned slots and possibly multiple detectors could be used to detect position/angle (see gray code for an implementation of this).

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