Generic Relay (active low)

[sgtpepperaut]

The most common relays sold on ebay/amazon are active low ( when input is driven low they engage). The reason for this are beyond me but i'm having trouble configuring espeasy for this.

Everything works but "inverted" when i turn my mqtt on from home assistant the relay switches OFF and when i turn it On the Relay Switches On. This is because the output is driven high for "on".

I see inverted logic and active low options but they do not work as expected. When i set the "inverse logic" option and reboot the mqtt commaands are not doing anything anymore. the relay just stays in the state is is in. From the debugger i can see that esp easy is getting the mqtt commands


hardware config:

[sgtpepperaut]

a dirty fix was to invert the payload in the mqtt command however this is obviously bad practise (0 is ON and 1 is OFF...)

[grovkillen]

Inverse logic uncheck. Reboot.

Does that work?

[sgtpepperaut]

with inverted logic of it works just the wrong way around. By default and "common sense" driving an input high would actuate the relay but unfortunately these common relais you see everywhere are driven with input low..

[grovkillen]

That is why I wrote uncheck. You need to either reboot or switch on/off once or twice for the state to get set according to setting.

[papperone]

with inverted logic of it works just the wrong way around. By default and "common sense" driving an input high would actuate the relay but unfortunately these common relais you see everywhere are driven with input low..

There are reasons and i do believe this "inverted logic" is better when drivng relays.
I do have many installed and working properly with ESPEasy at home.

[megamarco83]

with inverted logic of it works just the wrong way around. By default and "common sense" driving an input high would actuate the relay but unfortunately these common relais you see everywhere are driven with input low..

There are reasons and i do believe this "inverted logic" is better when drivng relays.
I do have many installed and working properly with ESPEasy at home.

hi, i have 4 different board with relay some 2ch some 4ch some 8ch "arduino relay board"

when they are not connected to nothing: NC=close(active) NO=open
when i connect the relay to nodemcu with espeasy and external supply like this:
https://www.letscontrolit.com/wiki/index.php/Relais

the relay is triggering when is connected and so: NC=now is open NO=now is close

so when i set:
http://espeasyIP/control?cmd=GPIO,13,0 -> relay is active -> NO=close NO=open
http://espeasyIP/control?cmd=GPIO,13,1 -> relay is not acrive -> NC=close NO=open

i need to code the opposite of the log in this way

i try set on switch web page in espeasy the flag to "inversed logic" but nothing change!
http://espeasyIP/control?cmd=GPIO,13,0 -> trigger ON the relay -> NC=open NO=close
http://espeasyIP/control?cmd=GPIO,13,1 -> trigger OFF the relay -> NC=close NO=open
so no difference....what's the purpose of "inversed logic" ??

is possible to have: 1 ="higt" relay trigger -> NC=close
"0 = low" relay not trigger -> NO=open
thanks

here my configuration with "inversed logic" not connected
if i check the flag, nothing change from logic 0/1
https://www.letscontrolit.com/forum/dow ... hp?id=3355