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sorry, but I don’t have any limit switches connected…
I’m using the grounds on the limit switches connectors to connect the Kress shaft.
Many years ago I did developments in industrial environment and can remember, that it isn’t a good solution to wire TTL lines through a machine environment. PLC’s always have some special input circuits, which are mostly optocuppled and uses 24V or, 12V inputs, which needed a few mA to stimulate. We also had some software de-bouncing for the inputs.
I’ll search for a schematic of a PLC input circuit and then I’ll wire the tool length sensor plate to this input and put the Kress shaft to +12V supply…
Christian, is there any de-bouncing programed in the AVR firmware?