Preventing Simultaneous Activation of Both Relays in OpenBK7231T-Tuya Shutter Switch

Question

I just flashed my tuya shutter switch with openbk7231t and everything is working correctly. but how can I prevent activating both relays at the same time? I need something like the shutter mode in tasmota. or is my only option to replace the WB3S chip with ESP and flash tasmota on it?

maliciamrg · Accepted Answer

hello ,

Thks to you two i have complet the setting of my shutter switch WF-CS01_EU

in complement of your setting , i post mine (5 leds , 3 buttons and 2 relai) :

and like sugest p.kaczmarek2 , i add a autoexec.bat file , who mimic the original firmware :


//blue led on
SetStartValue 3 1

// interlock relais
addChangeHandler Channel0 == 1 SetChannel 2 0
addChangeHandler Channel2 == 1 SetChannel 0 0

//cancel button
addChangeHandler Channel1 == 1 SetChannel 0 0
addChangeHandler Channel1 == 1 SetChannel 2 0

//toggle night led mode
addEventHandler OnHold 10 ToggleChannel 3

//auto cancel relais after delai 34s
addChangeHandler Channel0 == 1 addRepeatingEventID 34 1 910 SetChannel 0 0
addChangeHandler Channel2 == 1 addRepeatingEventID 34 1 912 SetChannel 2 0

//auto cancel cancel button after 5s
addChangeHandler Channel1 == 1 addRepeatingEventID 5 1 911 SetChannel 1 0

//auto cancel cancel relai
addChangeHandler Channel1 == 1 cancelRepeatingEvent 910
addChangeHandler Channel1 == 1 cancelRepeatingEvent 912

p.kaczmarek2 · Answer

Well, I can write any driver for you if you want, but it should be also possible to both configure or script OBK to suit your needs.

You could, for example, set one relay Rel and second to Rel_n, and set them both to single channel, then they would work in mutually exclusive way.

You could also use some scripting - for example, make a change handler and do something there:


addChangeHandler Channel0 == 1 YourCommandHere
addChangeHandler Channel0 == 0 YourCommandHere

You can use any command in event handler, or even start a script.
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/commands.md
You can also use repeating event with counter set to 1 to do something after a delay.


addRepeatingEvent 2 1 setChannel 0 0

but again, if you have a specific use case in mind, I can write a dedicated driver for you, as long as you can explain how is it supposed to work. Show your device configuration, etc.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.

hoezyhoest · Answer

i tried setting them both to single channel but it still keeps one of them constantly on.
i tried the scripting part but that is a bit complicated for me

(i do know how to run them)

i'm using a switch like this and i need something like the InterLock setting in tasmota so that none can accidentally fire two relays on the physical touch buttons
https://templates.blakadder.com/WF-CS01_EU.html

these are my settings:

p.kaczmarek2 · Answer

I am not sure yet, but just maybe, this autoexec.bat (in Web Application ->LittleFS tab) can help?


// when channel 0 becomes 1, turn off channel 1
addChangeHandler Channel0 == 1 SetChannel 1 0
// when channel 1 becomes 1, turn off channel 0
addChangeHandler Channel1 == 1 SetChannel 0 0

I haven't done shutters yet. Futhermore, do they require turning off both relays after a given time?

hoezyhoest · Answer

thnx alot! this is the same as the interlock from tasmota and works like a charm

i'm using home assistant to time the relays so that's not a problem. this was only for protection so i won't blow up the motors by accident.

cheers!

p.kaczmarek2 · Answer

So you've made a shutters support entirely in our scripting language? Nice. I've been also prototyping something like that, here:

maliciamrg · Answer

Wow, now I know how to use alias and backlog, pretty powerful. If I can suggest a use case to add in your demo, the possible mind changing of a user. (aka: I start to open my shutter but at the mid course I change my mind and decide to close it) Thanks for your work for developing this firmware which saves a lot of my wifi OT, you rock.

p.kaczmarek2 · Answer

Your script seems pretty nice, you could submit it as another demo/self test (in separate file) via pull request

spleefer90 · Answer

I also need this, and the scripting works, but it triggers the relay before deactivating the second one.

This happens near instantly, but it still means both are on for a split second, does it not?

I cannot use the Rel Rel_n on the same channel, as I have two relays controlling my electric roller blinds going up or down.

I want to either send UP with rel1, or DOWN with rel2, or neither when idle.
I do not want to send them either an ON or OFF signal at all times, I want to send no signals when idle (both relays off).
I do not want them to ever be ON and OFF at the same time (already fried one relay).

The handler setchannel is my current solution for the time being, but I do hope I can hook something to turn the relay on another channel OFF before turning one ON.

EDIT: This code seems to not be enough, seems like the split moment is enough to break my relay and invert it, broke another one. I think I want a small delay of OFF on both relays before one triggers on, but I am lost as to how to do this on OBK.

p.kaczmarek2 · Answer

I'm working on alternate solution for that - ability to link two pins to single channel and use 3 channel values for disabled, up or down.
Currently working self-test code:

Log in, to see the code

spleefer90 · Answer

See - it uses the new (not merged at time of writing) mutex driver to do this safely without triggering both inputs at the same time for a fraction of the setup.

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