I’m using a 74HC595 chip (shift register) NPX semiconductors, connected to and arduino board. Basically the shift register switches on and off 8 leds in sequence.
Everything seem to be working, code and pin wiring to the chip are fine.
The issue is that sometimes the circuit seems to have some problems and the leds are all frozen. I've noticed that when I move the breadboard in some specific locations or simply pass the hand over some wires all the circuit starts working fine. Clearly I’ve checked all the wiring connections and from that point there is no problem. What I’m suspecting is that there is some kind of EMF noise disturbing the setup.
From what I know only high frequency application can be affected by this problem, but I’m working with just 5V and nothing is going beyond 1MHz.
What can be the possible issues? What are the topics I need to study to prevent this problem? How to prevent it?
The following are links to: My video showing the possible noise problem The schematics I got from fritzing.org
I've added a 100uF capacitor, but nothing solved