Opto encoder direction using a single wire input

Other Hardware Sensors
1

Hello. New here.
I have an opto encoder on a brushed motor on an interrupt on a mega and h bridge. All works as it should.
I'd like to try to work out the motor direction. I realise my opto encoder isn't suited for this purpose, But I'd like to try something...
I have printed a wheel as in the image.
Do you guys think it is possible to work out the motor direction using the spaced holes?

image

2

I think it will work fine, for reference do some research on missing tooth, this is common in the automotive world as a position sensor.

3

Thank you. It does work fine. But do you think Its possible to code in to get the direction of spin? Cw or ccw?

4

I would think so. The pattern of teeth and gaps will be determined by the direction of rotation.

1>gap>2>gap>3>big gap will be ccw

3>gap>2>gap>1>big gap will be cw.

Thinking of how to code for this is making my head spin both ccw and cw.

5

Nice. I need to think then. The fun part. As long as its possible :+1:

6

Should not be a problem After the delay do you get three consecutive pulses or 1 space and two.

Look at this image, it is for quadrature detection.

image
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Pick any edge of either sensor and see what level the other sensor is at at that edge. Hint if you use pin B and rising edge, Pin A will be high for Clockwise and low for counter wise. Using the edge interrupt on an Arduino and any other pin you can calculate speed and direction.
Here is a simple circuit for you:
image

Note the Flip Flop does the direction decoding for you, that is what I did in software using an interrupt. You can divide the output to cut processor overhead if you want.