Hi experts,
I am designing a low-budget signalling system that has to operate over hundreds of yards (or even metres), using an 18m2 project board. Obviously voltage drops and interference would be a problem over this distance, so I am just using high/low logic states and LEDs, no data.
I have a test bed which works excellently over small and medium distances but gets to a cable length where one particular input switch causes a reset, the other inputs and outputs still function well. It seems to be a momentary problem as, with the basic equipment I have, I can detect no loss of power; general voltage drops over that distance are within operable limits.
The cable is overall shielded multicore; we cannot aford anything more fancy for that length, and I am uninformedly guessing the changes of voltages in different directions are affecting other directions for an instant.
I have very little understanding of filters and other dodads to cope with long cable runs. Can anyone recommend any alterations or additions to components that might aleviate the situation, or any other strategy I could try?
Many thanks.
I am designing a low-budget signalling system that has to operate over hundreds of yards (or even metres), using an 18m2 project board. Obviously voltage drops and interference would be a problem over this distance, so I am just using high/low logic states and LEDs, no data.
I have a test bed which works excellently over small and medium distances but gets to a cable length where one particular input switch causes a reset, the other inputs and outputs still function well. It seems to be a momentary problem as, with the basic equipment I have, I can detect no loss of power; general voltage drops over that distance are within operable limits.
The cable is overall shielded multicore; we cannot aford anything more fancy for that length, and I am uninformedly guessing the changes of voltages in different directions are affecting other directions for an instant.
I have very little understanding of filters and other dodads to cope with long cable runs. Can anyone recommend any alterations or additions to components that might aleviate the situation, or any other strategy I could try?
Many thanks.