Good afternoon to all staff of the forum I'm starting with the Arduino but I got a problem in the hands of a project developed by another person and because my inesperiencia can not find how to solve this problem.
My question is I have a project that has been working properly but since the installation of a higher capacity UPS began to show me interference with a specific equipment, keypad access control (Roslare). I liked knowing if exists some form of filter these interferences so as to minimizalas or even eliminates-las. I have a 10K in series resistance in output as advises on the page of the Arduino but it did not solve the problem some other way to filter these interferences?
thanks for listening