hostingolz.blogg.se - Fritzing ac power supply part

If so, that could be problematic given the ultimate location of this project out in the yard. is this electrically separate? or are you saying that I would need to supply the 5V DC adapter for the relay module from a completely different 120V AC circuit? AND supplies the 9V DC adapter for the Arduino.

If the 120V AC receptacle that supplies power to the 5V DC wall adapter (which would be the supply for the relay module), also supplies power for the 120V AC devices that the module is controlling.

Thanks for this dlloyd.you gave me a lot of info here, most of it went over my head, but I've been researching to try and figure it out and come up a bit short on the following questions. Of course, the size of the load also plays a role.

At higher voltages, emissive EMI plays a greater role.

Opto-isolation is most likely all that's needed when switching 120VAC inductive loads. Also, increasing the distance from the Arduino to the Relay board and AC load and wiring helps. Here RC snubber, MOV and Ferrite coil are some arc-suppression techniques. Solutions for this attempt to dampen the arc-energy across the contacts or inductive energy across the load.

There'll be absolutely no conductive path to transmit interference.Įven though opto-isolation resolves conductive interference, emissive interference could also create problems. So being both electrically separate from the Arduino and the mains is what's required to utilize complete optical isolated control of the relay.

Yes, wall adapters are isolated from the mains and are OK, but I'm not sure about using those ultra miniature USB chargers available at the dollar store or eBay. Also needs to be isolated from the mains. Yes, a different 5VDC supply that isn't shared with the supply that powers the Arduino's supply.