Let's Control It

Posted: **20 May 2017, 16:01**

Hi,

I have a Wemos D1 mini running V1.20 with a relay board attached and also a push button (momentary) switch.

Everything is controlled via Node-Red and works as expected, but I wanted to add a rule so that the local button flips the state of the relay and publishes a relevant message so the unit can work 'offline' too if Node-red is not responding for whatever reason.

The push button flips from 1 to 0 and back when pushed and the devices setup is as follows:

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1	Switch input	button		172	GPIO-13
2	Output - (Domoticz MQTT helper)	relay		1	GPIO-5

Both definitions have a value of 'state'.

I have read the wiki and tried a few permutations to create a rule without success - this is where I gave up:

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on System#Boot do
  gpio,5,0 // Prevent relay turning on during boot
endon

on button#state=0 do
     if [gpio,5]=1
      gpio,5,0
      gpio,0,0
      Publish /RELAY172/relay/state,0
    else
      gpio,5,1
      gpio,0,1
      Publish /RELAY172/relay/state,1
    endif
endon

This code seems to always run the 'else' condition as I can see Mosquitto receiving '/RELAY172/relay/state 1' every time the button is pressed and released. I suspect I have done something obviously wrong, but have spent so much time on this that I am not seeing it.

Supplemental questions:
==========
As well as

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if [gpio,5]=1

I have tried

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if [relay#state]=1

- is that allowed?
==========
Can you use

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relay#state=1

to set the state of the relay as well as/instead of

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 gpio,5,1

==========
Which syntax can be used (or both?):

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on button#state=0 do

and

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on [button#state]=0 do

Any coding advice appreciated.

Thanks

Posted: **23 May 2017, 13:40**

You have to declare a device to be able to read the state, or use a dummy to hold the state.

Something like:

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on pushbutton#g0=1 do
  if [dummy#d1]=1      // Check dummy value
  gpio,13,0
  gpio,12,0
  TaskValueSet 1,1,0   // Set dummy value
  else 
   gpio,13,1
   gpio,12,1
   TaskValueSet 1,1,1  // Set dummy value
  endif
endon

Regards,

Let's Control It

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Rules for an autonomous switch for a relay

Re: Rules for an autonomous switch for a relay