relaysolid-state-relayswitchingwiring
I am working on a IOT application and I want to control a switch as per two way wiring using SSR.
I have made it with Relay which is having two NO NC contact but I wonder how will it possible with SSR.
Two way wiring diagram is as follows.
With SSR I can't have this
Any help would be appreciated
Thanks in advance
I have some bad news for you. Those SSRs have a "naked" infrared LED at the input. If you apply 3.3V or 5V on the input terminals without a current-limiting resistor, you'll more-than-likely destroy the SSR almost instantly. You should connect a series resistor to limit the current to something reasonable given the Vf of the LED. Something like 15mA or 20mA.
Also, they're unsuitable for switching low voltage DC- they're designed to switch high voltage AC at the zero crossings. Probably they won't switch off once they've switched 'on' (depending on whether your LED current happens to exceed the holding current of the triac), or in the case of your circuit they will switch 'on' once only per SSR.
I finally found the cause.
The hum was coming from the 3 way valve, which is also activated when the brew switch is flipped. When I activated the hot wire of the pump and the hot wire of the 3 way valve using a relay, the pump worked as it should.
Best Answer
Think a little bit out of the box. You have two independent signals that each want to invert the action of the other - that's how a two way light switch works and, importantly, that is how an exclusive OR gate works.
So, whatever form your two independent signals take - make them logic compatible and feed them into an exclusive OR gate then, with an appropriate transistor, stage drive the SSR. When you said: -
I have to disagree because the "clever" logic is on the input side.