I also see the LED next to the relay light up when I do a digital write on the Arduino to a specific relay pin. I've identified the input pins correctly and am able to send digital signals to it and it responds correctly. engage) a relay on the I/O Shield, but nothing seems to be working. Safety first.I have an Arduino Uno and the I/O Shield wired up and I'm trying to switch (i.e. The only pin that would ever be live is the common pin. ¹ Note: doing it this way around ensures that when the relay is in the off position the NC pin isn't live. ![]() If this is what you want, then you will have to ensure that the relay designated as master (and its connector) has at least three times the capacity of the other three relays and connectors (or all four relays have at least three times the capacity you would otherwise need). The only way your arrangement could work would be to designate one relay as a master power control and that one has the main power coming in which then feeds through to the common rail to supply the other three relays. You should have 2 connections to each relay - in and out where in connects to the NO and out connects to the common pin¹. That part of the circuit makes no sense to me at all. With an Isolation Transformer electrocution is only possible if you contact both terminals at once as opposed to just one terminal of the normal mains supply.Įdit: One thing that does puzzle me with your circuit is how you have wired up the common pin of the relays. Either ensure that you have an ELCB and an RCD on your ring main / power outlet (with the former you must ensure that you have your earth wires connected properly), or even better (and what I would certainly recommend above all else), use an Isolation Transformer to separate you from the mains circuit entirely. One more tip: Do all your mains experimentation as safe as possible. Remember: Mains voltages are dangerous, caution and safety should be your first concern over everything else! This is especially critical around such areas as the USB socket where through-hole components (like screw terminal blocks) are likely to short circuit and cause very very nasty things to happen.
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