Pro 4PM script - if one switch is on, the other must be off

macthaidhg

I'm really excited by Shelly scripts, but as I am not a programmer I will need some assistance! Essentially my application requires that switch 1 and switch 2 should not be on at the same time. So, if switch 1 is on and switch 2 is switched on, switch 1 goes off. And the opposite: if switch 2 is on and switch 1 is switched on, switch 2 goes off.

Seven of Nine

That's in theory possible via Scripting.

Question: Do you need a strict interlock between the relais?

I'm not 100% sure but there's probably a few milliseconds delay if relay0 goes on and relay1 has to be turned off via script, so there's eventually a short time where both relais would be active. It's definetely safer to use a contactor interlock.

macthaidhg

Thanks for your quick response! You make a good point. relay0 and relay1 are powering two heating elements in a water heater - both elements should not be on at the same time. So, if possible the script would need to avoid both relays being active at the same time... overcurrent protection would kick in!

Seven of Nine

this is a quick'n dirty solution, but as said: there's probably a few milliseconds delay.

Explaination:

if switch:0 is turned on switch:1 (id: 1) is turned off

if switch:1 is turned on switch:0 (id 0) is turned off

It's still possible to turn off both relays

If you prefer to use the remaining switch 3/4 from the Pro4PM just replace the switch:x and "id": y

Code

 Shelly.addStatusHandler(function(e) {
  if (e.component === "switch:0") {
    if (e.delta.output === true) {
        Shelly.call("Switch.Set", {"id": 1, "on": false});
    }
  }
  if (e.component === "switch:1") {
    if (e.delta.output === true) {
        Shelly.call("Switch.Set", {"id": 0, "on": false});
    }
  }
});

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macthaidhg

Thank you!! I will update as soon as I get to try it

Pro 4PM script - if one switch is on, the other must be off

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