Using analog (IN) for laser control? Be Aware of Danger!

[Stefan Hechenberger]

Some of you have started experimenting with controlling the laser
through the analog "IN" pin (instead of the recommended TH pin).

Please be aware that this may cause the laser to fire in certain
situations. For example: when flashing new firmware and briefly when
shutting down via e-stop.

The reason is that the DY-13 laser PSU interprets a disconnected "IN" as
100%. So when the controller goes into such a state of neither sinking
nor sourcing current, the laser fires.

Unless you know what you are doing, use the recommended control wiring
to the TH pin.

--
Stefan Hechenberger
studio: Nortd Labs - labs.nortd.com
resident: F.A.T. Lab - fffff.at
project: Lasersaur - labs.nortd.com/lasersaur

[stefanix]

Correction:

The reason is that the DY-13 laser PSU interprets a disconnected "IN" as

about 40%.

Still same problem.