Hi! I have the following setup (sorry for noobish picture): http://shrani.si/f/g/12I/kkTrrGw/image.png Since the bell ringing machine's relay "ON" time is minimally 100ms, I had to go through Arduino Uno (where solenoid can be turned on for the needed 40ms). I am using the following code: void s…

Interrupts problems due to noise

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