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Detecting an open/closed door

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I have a set of sliding doors on a building, made using frames and frame motors.

I need a redstone signal to give me indication that they are either open or closed.

My original idea was to have a daylight sensor in the floor with a glass block above it, and to send the signal through the next block with redstone + torch on the other side (so there was no light let into the sensor area).

When the door was over the single block - no light... I should get an output.

But it doesn't work.

I thought daylight sensors were adjustable, but screwdrivers just rotate them

Any other ideas for sensors?

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